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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<h4>
<a name="boost_asio.history.h0"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_12_2___boost_1_69"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_12_2___boost_1_69">Asio
1.12.2 / Boost 1.69</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Fixed a problem with the detection of <code class="computeroutput">std::future</code> availability
with libstdc++.
</li>
<li class="listitem">
Fixed compile error in regex overload of <code class="computeroutput">read_until</code>.
</li>
<li class="listitem">
Fixed a timer heap corruption issue that can occur when moving a cancelled
timer.
</li>
<li class="listitem">
Fixed detection of <code class="computeroutput">std::experimental::string_view</code> and <code class="computeroutput">std::string_view</code>
with newer clang/libc++.
</li>
<li class="listitem">
Fixed MSVC version detection for availability of <code class="computeroutput">std::invoke_result</code>.
</li>
<li class="listitem">
Fixed the buffer sequence traits to test the new requirements, if <code class="computeroutput">decltype</code>
is available.
</li>
<li class="listitem">
Fixed an MSVC issue when building with exceptions disabled.
</li>
<li class="listitem">
Added SSL context options for TLS v1.3.
</li>
<li class="listitem">
Added a compile-time test for TLS v1 support.
</li>
<li class="listitem">
Fixed the macro used to test for TLS v1.2 support.
</li>
<li class="listitem">
Prevented global objects from being created once per thread on Windows.
</li>
<li class="listitem">
Fixed a crash when using <code class="computeroutput">size()</code>, <code class="computeroutput">max_size()</code> or
<code class="computeroutput">empty()</code> on default-constructed resolver results.
</li>
<li class="listitem">
Changed to move the return value in basic_resolver_results::begin() to
avoid copying.
</li>
<li class="listitem">
Enabled move support for the Intel Compiler.
</li>
<li class="listitem">
Fixed <code class="computeroutput">std::string_view</code> detection issue when using clang-cl.
</li>
<li class="listitem">
Fixed the handler tracking operation name for <code class="computeroutput">io_context::executor_type::dispatch</code>.
</li>
<li class="listitem">
Fixed a buffer overflow that could occur when parsing an address string
with a 64-bit scope id.
</li>
<li class="listitem">
Added examples showing how to write composed operations.
</li>
<li class="listitem">
Added C++11 versions of the Timeouts, Timers, SOCKS4 and SSL examples.
</li>
<li class="listitem">
Fixed minor issues in documentation and examples.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h1"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_12_1___boost_1_67"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_12_1___boost_1_67">Asio
1.12.1 / Boost 1.67</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Added missing const qualifier to <code class="computeroutput">basic_socket_acceptor::get_option</code>.
</li>
<li class="listitem">
Worked around a parsing error that occurs with some versions of gcc.
</li>
<li class="listitem">
Fixed broken code samples in tutorial.
</li>
<li class="listitem">
Added new experimental features. (Note that "experimental" features
may be changed without notice in subsequent releases.)
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; ">
<li class="listitem">
Added <code class="computeroutput">experimental::detached</code> completion token.
</li>
<li class="listitem">
Added <code class="computeroutput">experimental::redirect_error</code> completion token.
</li>
<li class="listitem">
Added <code class="computeroutput">experimental::co_spawn</code> facility for integration
with the coroutines technical specification.
</li>
</ul></div>
</li>
<li class="listitem">
Updated timeout examples to use latest features.
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; ">
<li class="listitem">
Used <code class="computeroutput">asio::steady_timer</code> rather than <code class="computeroutput">asio::deadline_timer</code>.
</li>
<li class="listitem">
Used <code class="computeroutput">asio::dynamic_buffer</code> rather than <code class="computeroutput">asio::streambuf</code>.
</li>
<li class="listitem">
Used timed <code class="computeroutput">asio::io_context::run_for()</code> function for
blocking clients.
</li>
<li class="listitem">
Added example showing a custom completion token for blocking with
timeouts.
</li>
</ul></div>
</li>
<li class="listitem">
Fixed unit tests to compile when <code class="computeroutput">BOOST_ASIO_NO_DEPRECATED</code>
is defined.
</li>
<li class="listitem">
Changed socket iostreams to use chrono by default, to fix compatibility
with the Networking TS. Define <code class="computeroutput">BOOST_ASIO_USE_BOOST_DATE_TIME_FOR_SOCKET_IOSTREAM</code>
to enable the old Boost.Date_Time interface in <code class="computeroutput">basic_socket_streambuf</code>
and <code class="computeroutput">basic_socket_iostream</code>.
</li>
<li class="listitem">
Updated examples to use chrono rather than Boost.Date_Time.
</li>
<li class="listitem">
Fixed an incorrect member function detector in the <code class="computeroutput">is_dynamic_buffer</code>
trait.
</li>
<li class="listitem">
Fixed an <code class="computeroutput">async_result</code> incompatibility with deprecated <code class="computeroutput">handler_type</code>.
</li>
<li class="listitem">
Added a missing move optimisation in the SSL stream implementation.
</li>
<li class="listitem">
Fixed incorrect <code class="computeroutput">basic_resolver_results::value_type</code> typedef.
</li>
<li class="listitem">
Fixed a compile error with some OpenSSL versions when <code class="computeroutput">SSL_OP_NO_COMPRESSION</code>
is defined.
</li>
<li class="listitem">
Changed <code class="computeroutput">add_certificate_authority</code> to process multiple certificates
in a bundle.
</li>
<li class="listitem">
Eliminated deprecation warning with MSVC by using <code class="computeroutput">std::invoke_result</code>
rather than <code class="computeroutput">std::result_of</code>.
</li>
<li class="listitem">
Changed to use <code class="computeroutput">std::string_view</code> for C++17 or later, and <code class="computeroutput">std::experimental::string_view</code>
for C++14. Define the preprocessor macro <code class="computeroutput">BOOST_ASIO_DISABLE_STD_STRING_VIEW</code>
to force the use of std::experimental::string_view (assuming it is available)
when compiling in C++17 mode.
</li>
<li class="listitem">
Ensured <code class="computeroutput">DynamicBuffer</code> template arguments are decayed before
using in <code class="computeroutput">enable_if</code> tests.
</li>
<li class="listitem">
Changed documentation to distinguish legacy completion handlers (which
are still required to be CopyConstructible) from new MoveConstructible
handlers.
</li>
<li class="listitem">
Suppressed a discarded return value warning in the buffer debugging support.
</li>
<li class="listitem">
Fixed <code class="computeroutput">basic_yield_context</code> to work with completion signatures
containing reference parameters.
</li>
<li class="listitem">
Ensured that stackful coroutines launched using <code class="computeroutput">spawn()</code> correctly
store decayed copies of their function and handler arguments.
</li>
<li class="listitem">
Fixed some compatibility issues with Android.
</li>
<li class="listitem">
Added cross-compilation support to Jamfiles.
</li>
<li class="listitem">
Fixed some minor portability issues in examples.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h2"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_12_0___boost_1_66"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_12_0___boost_1_66">Asio
1.12.0 / Boost 1.66</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Implemented interface changes to reflect the Networking TS (<a href="../www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/n4656.pdf" target="_top">N4656</a>).
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; ">
<li class="listitem">
See the <a class="link" href="net_ts.html" title="Networking TS compatibility">list</a> of new interfaces
and, where applicable, the corresponding old interfaces that have
been superseded.
</li>
<li class="listitem">
The service template parameters, and the corresponding classes, are
disabled by default. For example, instead of <code class="computeroutput">basic_socket<Protocol,
SocketService></code> we now have simply <code class="computeroutput">basic_socket<Protocol></code>.
The old interface can be enabled by defining the <code class="computeroutput">BOOST_ASIO_ENABLE_OLD_SERVICES</code>
macro.
</li>
</ul></div>
</li>
<li class="listitem">
Removed previously deprecated functions.
</li>
<li class="listitem">
Added support for customised handler tracking.
</li>
<li class="listitem">
Added reactor-related (i.e. descriptor readiness) events to handler tracking.
</li>
<li class="listitem">
Added special <a class="link" href="overview/core/concurrency_hint.html" title="Concurrency Hints">concurrency
hint</a> values that may be used to disable locking on a per <code class="computeroutput">io_context</code>
basis.
</li>
<li class="listitem">
Enabled perfect forwarding for the first <code class="computeroutput">ssl::stream<></code>
constructor argument.
</li>
<li class="listitem">
Added ability to release ownership of the underlying native socket. (Requires
Windows 8.1 or later when using the I/O completion port backend.)
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h3"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_10_10___boost_1_65"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_10_10___boost_1_65">Asio
1.10.10 / Boost 1.65</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Changed to require <code class="literal">g++</code> versions >= 4.7 to use standard
atomics, to fix a linker error when using <code class="literal">g++</code> 4.6 (<a href="https://svn.boost.org/trac/boost/ticket/13121" target="_top">#13121</a>).
</li>
<li class="listitem">
Enabled use of <code class="computeroutput">constexpr</code> and variadic templates with recent
MSVC versions.
</li>
<li class="listitem">
Fixed a race condition in the Linux epoll backend, which may occur when
a socket or descriptor is closed while another thread is blocked on epoll.
</li>
<li class="listitem">
Eliminated use of deprecated <code class="computeroutput">auto_ptr</code>.
</li>
<li class="listitem">
Fixed misplaced use of <code class="computeroutput">asio_handler_is_continuation</code> result
in reactive <code class="computeroutput">async_accept</code> implementation.
</li>
<li class="listitem">
Changed to use <code class="computeroutput">poll.h</code> rather than <code class="computeroutput">sys/poll.h</code>
on some modern POSIX platforms (<a href="https://svn.boost.org/trac/boost/ticket/12419" target="_top">#12419</a>).
</li>
<li class="listitem">
Fixed MSVC intellisense detection.
</li>
<li class="listitem">
Disabled use of the <code class="computeroutput">__thread</code> keyword extension for android/clang/x86
targets.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h4"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_10_9___boost_1_64"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_10_9___boost_1_64">Asio
1.10.9 / Boost 1.64</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Added limited support for using regular file descriptors (where I/O operations
should never fail with <code class="computeroutput">EAGAIN</code> or <code class="computeroutput">EWOULDBLOCK</code>)
with <code class="computeroutput">posix::stream_descriptor</code>, when using the Linux epoll
backend.
</li>
<li class="listitem">
Changed to use <code class="computeroutput">allocator_traits</code> to rebind allocators in C++11
or later.
</li>
<li class="listitem">
Eliminated a double "construction" issue in the converting move
constructors.
</li>
<li class="listitem">
Added new <code class="computeroutput">ssl::context_base</code> enumerations to enable support
for any TLS version, and improved consistency of SSL/TLS version handling
across OpenSSL releases.
</li>
<li class="listitem">
Applied more changes to address OpenSSL 1.1 compatibility.
</li>
<li class="listitem">
Fixed a compile error when OpenSSL compression is disabled at compile time.
</li>
<li class="listitem">
Suppressed some spurious unused variable warnings issued by <code class="literal">gcc</code>
(<a href="https://svn.boost.org/trac/boost/ticket/12302" target="_top">#12302</a>).
</li>
<li class="listitem">
Worked around a new clang warning issued for usage of the comma operator.
</li>
<li class="listitem">
Fixed various header ordering problems.
</li>
<li class="listitem">
Changed to refer <code class="computeroutput">std::atomic_thread_fence</code>, when available,
to eliminate a deprecated function warning on newest macOS SDK (<a href="https://svn.boost.org/trac/boost/ticket/12482" target="_top">#12482</a>).
</li>
<li class="listitem">
Added a workaround for broken <code class="computeroutput">getaddrinfo</code> in Apple's NAT64
environment.
</li>
<li class="listitem">
Fixed an exception safety issue in the internal hash map implementation.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h5"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_10_8___boost_1_62"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_10_8___boost_1_62">Asio
1.10.8 / Boost 1.62</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Added compatibility with OpenSSL 1.1.0 (<a href="https://svn.boost.org/trac/boost/ticket/12238" target="_top">#12238</a>).
</li>
<li class="listitem">
Fixed out-of-bounds iterator use in <code class="computeroutput">asio::connect()</code> when the
<code class="computeroutput">connect_condition</code> returns an end iterator (<a href="https://svn.boost.org/trac/boost/ticket/12354" target="_top">#12354</a>).
</li>
<li class="listitem">
Added a workaround for a move detection problem on MSVC 2015 Update 2 (<a href="https://svn.boost.org/trac/boost/ticket/12115" target="_top">#12115</a>).
</li>
<li class="listitem">
Changed a workaround that was previously added for broken Windows firewalls
to only bind to 127.0.0.1 if <code class="computeroutput">getsockname</code> reports 0.0.0.0 (<a href="https://svn.boost.org/trac/boost/ticket/12406" target="_top">#12406</a>).
</li>
<li class="listitem">
Added call to <code class="computeroutput">SSL_COMP_free_compression_methods</code> to fix two
memory leaks reported at shutdown, for OpenSSL versions >= 1.0.2 and
< 1.1.0 (<a href="https://svn.boost.org/trac/boost/ticket/10795" target="_top">#10795</a>).
</li>
<li class="listitem">
Fixed <code class="computeroutput">use_future</code> compile error encountered on some standard
library implementations, by changing <code class="computeroutput">std::allocator<void></code>
use to a non-void template parameter.
</li>
<li class="listitem">
Enabled use of native <code class="computeroutput">getaddrinfo</code> by default on Apple OSes,
rather than emulation in terms of <code class="computeroutput">getipnodebyname</code>.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h6"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_10_7___boost_1_60"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_10_7___boost_1_60">Asio
1.10.7 / Boost 1.60</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Added support for Windows 8.1 Store apps.
</li>
<li class="listitem">
Fixed macro multiple definition error on Microsoft Visual Studio 2015 (<a href="https://svn.boost.org/trac/boost/ticket/11539" target="_top">#11539</a>).
</li>
<li class="listitem">
Changed Asio's SSL wrapper to respect OpenSSL's <code class="computeroutput">OPENSSL_NO_SSL3</code>
feature test <code class="computeroutput">#define</code> (<a href="https://svn.boost.org/trac/boost/ticket/11754" target="_top">#11754</a>).
</li>
<li class="listitem">
Changed Asio's SSL wrapper to use OpenSSL's new <code class="computeroutput">SSL_CTX_clear_chain_certs</code>
function, if available.
</li>
<li class="listitem">
Suppressed a clang 3.6+ warning about unused typedefs (<a href="https://svn.boost.org/trac/boost/ticket/11767" target="_top">#11767</a>).
</li>
<li class="listitem">
Regenerated certificates used by SSL examples.
</li>
<li class="listitem">
Fixed buffer sizes passed to <code class="computeroutput">strncat</code> in the <code class="computeroutput">getaddrinfo</code>
emulation and in the SSL wrapper's password handling.
</li>
<li class="listitem">
Changed Windows backend to use non-macro <code class="computeroutput">CreateEventW</code> rather
than <code class="computeroutput">CreateEvent</code> (<a href="https://svn.boost.org/trac/boost/ticket/11732" target="_top">#11732</a>).
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h7"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_10_6___boost_1_58"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_10_6___boost_1_58">Asio
1.10.6 / Boost 1.58</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Ensured errors generated by Windows' <code class="computeroutput">ConnectEx</code> function are
mapped to their portable equivalents (<a href="https://svn.boost.org/trac/boost/ticket/10744" target="_top">#10744</a>).
</li>
<li class="listitem">
Added new macro <code class="computeroutput">BOOST_ASIO_DISABLE_CONNECTEX</code> to allow use
of <code class="computeroutput">ConnectEx</code> to be explicitly disabled.
</li>
<li class="listitem">
Fixed a race condition in <code class="computeroutput">windows::object_handle</code> when there
are pending wait operations on destruction (<a href="https://svn.boost.org/trac/boost/ticket/10624" target="_top">#10624</a>).
</li>
<li class="listitem">
Fixed IPv6 address parsing on FreeBSD, where a trailing scope ID would
cause conversion to fail with <code class="computeroutput">EINVAL</code>.
</li>
<li class="listitem">
Worked around shared library visibility issues by ensuring Asio types use
default visibility (<a href="https://svn.boost.org/trac/boost/ticket/9465" target="_top">#9465</a>, <a href="https://svn.boost.org/trac/boost/ticket/11070" target="_top">#11070</a>).
</li>
<li class="listitem">
Changed the SSL wrapper to call the password callback when loading an in-memory
key (<a href="https://svn.boost.org/trac/boost/ticket/10828" target="_top">#10828</a>).
</li>
<li class="listitem">
Fixed false SSL error reports by ensuring that the SSL error queue is cleared
prior to each operation.
</li>
<li class="listitem">
Fixed an <code class="computeroutput">ssl::stream<></code> bug that may result in spurious
'short read' errors.
</li>
<li class="listitem">
Removed a redundant null pointer check in the SSL engine (<a href="https://svn.boost.org/trac/boost/ticket/10088" target="_top">#10088</a>).
</li>
<li class="listitem">
Added options for disabling TLS v1.1 and v1.2 (<a href="https://svn.boost.org/trac/boost/ticket/10690" target="_top">#10690</a>).
</li>
<li class="listitem">
Removed use of deprecated OpenSSL function <code class="computeroutput">ERR_remove_state</code>.
</li>
<li class="listitem">
Fixed detection of various C++11 features with Clang (<a href="https://svn.boost.org/trac/boost/ticket/8835" target="_top">#8835</a>, <a href="https://svn.boost.org/trac/boost/ticket/10884" target="_top">#10884</a>).
</li>
<li class="listitem">
Fixed detection of C++11 <code class="computeroutput">std::addressof</code> with <code class="literal">g++</code>
(<a href="https://svn.boost.org/trac/boost/ticket/10982" target="_top">#10982</a>).
</li>
<li class="listitem">
Changed multicast test to treat certain <code class="computeroutput">join_group</code> failures
as non-fatal.
</li>
<li class="listitem">
Decoupled Asio unit tests from Boost.Test (<a href="https://svn.boost.org/trac/boost/ticket/11116" target="_top">#11116</a>).
</li>
<li class="listitem">
Changed the tutorial to use <code class="computeroutput">std::endl</code> to ensure output is
flushed.
</li>
<li class="listitem">
Fixed an unsigned integer overflow reported by Clang's integer sanitizer.
</li>
<li class="listitem">
Added support for move-only return types when using a <code class="computeroutput">yield_context</code>
object with asynchronous operations.
</li>
<li class="listitem">
Changed <code class="computeroutput">yield_context</code> to allow reentrant calls to the completion
handler from an initiating function.
</li>
<li class="listitem">
Updated detection of Windows Runtime to work with latest Windows SDK.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h8"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_10_5___boost_1_57"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_10_5___boost_1_57">Asio
1.10.5 / Boost 1.57</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Fixed the <code class="literal">kqueue</code> reactor so that it works on FreeBSD
(<a href="https://svn.boost.org/trac/boost/ticket/10606" target="_top">#10606</a>).
</li>
<li class="listitem">
Fixed an issue in the <code class="literal">kqueue</code> reactor which resulted
in spinning when using serial ports on Mac OS (<a href="https://svn.boost.org/trac/boost/ticket/10496" target="_top">#10496</a>).
</li>
<li class="listitem">
Fixed <code class="literal">kqueue</code> reactor support for read-only file descriptors
(<a href="https://svn.boost.org/trac/boost/ticket/10367" target="_top">#10367</a>).
</li>
<li class="listitem">
Fixed a compile error when using the <code class="literal">/dev/poll</code> reactor
(<a href="https://svn.boost.org/trac/boost/ticket/10350" target="_top">#10350</a>, <a href="https://svn.boost.org/trac/boost/ticket/10572" target="_top">#10572</a>).
</li>
<li class="listitem">
Changed the Windows backend to use <code class="computeroutput">WSASocketW</code>, as <code class="computeroutput">WSASocketA</code>
has been deprecated (<a href="https://svn.boost.org/trac/boost/ticket/10534" target="_top">#10534</a>).
</li>
<li class="listitem">
Fixed some warnings reported by Visual C++ 2013 (<a href="https://svn.boost.org/trac/boost/ticket/10376" target="_top">#10376</a>).
</li>
<li class="listitem">
Fixed integer type used in the WinRT version of the byte-order conversion
functions (<a href="https://svn.boost.org/trac/boost/ticket/10539" target="_top">#10539</a>).
</li>
<li class="listitem">
Changed documentation to indicate that <code class="computeroutput">use_future</code> and <code class="computeroutput">spawn()</code>
are not made available when including the <code class="computeroutput">asio.hpp</code> convenience
header (<a href="https://svn.boost.org/trac/boost/ticket/10567" target="_top">#10567</a>).
</li>
<li class="listitem">
Explicitly marked <code class="computeroutput">asio::strand</code> as deprecated. Use <code class="computeroutput">asio::io_service::strand</code>
instead.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h9"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_10_4___boost_1_56"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_10_4___boost_1_56">Asio
1.10.4 / Boost 1.56</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Stopped using certain Winsock functions that are marked as deprecated in
the latest Visual C++ and Windows SDK.
</li>
<li class="listitem">
Fixed a shadow variable warning on Windows.
</li>
<li class="listitem">
Fixed a regression in the <code class="literal">kqueue</code> backend that was introduced
in Asio 1.10.2.
</li>
<li class="listitem">
Added a workaround for building the unit tests with <code class="literal">gcc</code>
on AIX.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h10"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_10_3"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_10_3">Asio
1.10.3</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Worked around a <code class="literal">gcc</code> problem to do with anonymous enums
(<a href="https://svn.boost.org/trac/boost/ticket/10042" target="_top">#10042</a>).
</li>
<li class="listitem">
Reverted the Windows <code class="computeroutput">HANDLE</code> backend change to ignore <code class="computeroutput">ERROR_MORE_DATA</code>.
Instead, the error will be propagated as with any other (i.e. in an <code class="computeroutput">error_code</code>
or thrown as a <code class="computeroutput">system_error</code>), and the number of bytes transferred
will be returned. For code that needs to handle partial messages, the
<code class="computeroutput">error_code</code> overload should be used (<a href="https://svn.boost.org/trac/boost/ticket/10034" target="_top">#10034</a>).
</li>
<li class="listitem">
Fixed an off-by-one error in the <code class="computeroutput">signal_set</code> implementation's
signal number check (<a href="https://svn.boost.org/trac/boost/ticket/9324" target="_top">#9324</a>).
</li>
<li class="listitem">
Changed the Windows IOCP backend to not assume that <code class="computeroutput">SO_UPDATE_CONNECT_CONTEXT</code>
is defined (<a href="https://svn.boost.org/trac/boost/ticket/10016" target="_top">#10016</a>).
</li>
<li class="listitem">
Fixed a Windows-specific issue, introduced in Asio 1.10.2, by using <code class="computeroutput">VerifyVersionInfo</code>
rather than <code class="computeroutput">GetVersionEx</code>, as <code class="computeroutput">GetVersionEx</code> has
been deprecated.
</li>
<li class="listitem">
Changed to use SSE2 intrinsics rather than inline assembly, to allow the
Cray compiler to work.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h11"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_10_2"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_10_2">Asio
1.10.2</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Fixed <code class="computeroutput">asio::spawn()</code> to work correctly with new Boost.Coroutine
interface (<a href="https://svn.boost.org/trac/boost/ticket/9442" target="_top">#9442</a>, <a href="https://svn.boost.org/trac/boost/ticket/9928" target="_top">#9928</a>).
</li>
<li class="listitem">
Ensured that incomplete <code class="computeroutput">asio::spawn()</code> coroutines are correctly
unwound when cleaned up by the <code class="computeroutput">io_service</code> destructor (<a href="https://svn.boost.org/trac/boost/ticket/9731" target="_top">#9731</a>).
</li>
<li class="listitem">
Fixed delegation of continuation hook for handlers produced by <code class="computeroutput">io_service::wrap()</code>
and <code class="computeroutput">strand::wrap()</code> (<a href="https://svn.boost.org/trac/boost/ticket/9741" target="_top">#9741</a>).
</li>
<li class="listitem">
Changed the Windows I/O completion port backend to use <code class="computeroutput">ConnectEx</code>,
if available, for connection-oriented IP sockets.
</li>
<li class="listitem">
Changed the <code class="computeroutput">io_service</code> backend for non-Windows (and non-IOCP
Windows) platforms to use a single condition variable per <code class="computeroutput">io_service</code>
instance. This addresses a potential race condition when <code class="computeroutput">run_one()</code>
is used from multiple threads.
</li>
<li class="listitem">
Prevented integer overflow when computing timeouts based on some <code class="computeroutput">boost::chrono</code>
and <code class="computeroutput">std::chrono</code> clocks (<a href="https://svn.boost.org/trac/boost/ticket/9662" target="_top">#9662</a>, <a href="https://svn.boost.org/trac/boost/ticket/9778" target="_top">#9778</a>).
</li>
<li class="listitem">
Made further changes to <code class="computeroutput">EV_CLEAR</code> handling in the kqueue backend,
to address other cases where the <code class="computeroutput">close()</code> system call may hang
on Mac OS X.
</li>
<li class="listitem">
Fixed infinite recursion in implementation of <code class="computeroutput">resolver_query_base::flags::operator~</code>
(<a href="https://svn.boost.org/trac/boost/ticket/9548" target="_top">#9548</a>).
</li>
<li class="listitem">
Made the <code class="computeroutput">select</code> reactor more efficient on Windows for large
numbers of sockets (<a href="https://svn.boost.org/trac/boost/ticket/9528" target="_top">#9528</a>).
</li>
<li class="listitem">
Fixed a Windows-specific type-aliasing issue reported by <code class="literal">gcc</code>
(<a href="https://svn.boost.org/trac/boost/ticket/9550" target="_top">#9550</a>).
</li>
<li class="listitem">
Prevented execution of compile-time-only buffer test to avoid triggering
an address sanitiser warning (<a href="https://svn.boost.org/trac/boost/ticket/8295" target="_top">#8295</a>).
</li>
<li class="listitem">
Disabled the <code class="computeroutput">GetQueuedCompletionStatus</code> timeout workaround
on recent versions of Windows.
</li>
<li class="listitem">
Added support for string-based scope IDs when using link-local multicast
addresses.
</li>
<li class="listitem">
Changed IPv6 multicast group join to use the address's scope ID as the
interface, if an interface is not explicitly specified.
</li>
<li class="listitem">
Fixed multicast test failure on Mac OS X and the BSDs by using a link-local
multicast address.
</li>
<li class="listitem">
Various minor documentation improvements (<a href="https://svn.boost.org/trac/boost/ticket/8295" target="_top">#8295</a>, <a href="https://svn.boost.org/trac/boost/ticket/9605" target="_top">#9605</a>, <a href="https://svn.boost.org/trac/boost/ticket/9771" target="_top">#9771</a>).
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h12"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_10_1___boost_1_55"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_10_1___boost_1_55">Asio
1.10.1 / Boost 1.55</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Implemented a limited port to Windows Runtime. This support requires that
the language extensions be enabled. Due to the restricted facilities exposed
by the Windows Runtime API, the port also comes with the following caveats:
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; ">
<li class="listitem">
The core facilities such as the <code class="computeroutput">io_service</code>, <code class="computeroutput">strand</code>,
buffers, composed operations, timers, etc., should all work as normal.
</li>
<li class="listitem">
For sockets, only client-side TCP is supported.
</li>
<li class="listitem">
Explicit binding of a client-side TCP socket is not supported.
</li>
<li class="listitem">
The <code class="computeroutput">cancel()</code> function is not supported for sockets.
Asynchronous operations may only be cancelled by closing the socket.
</li>
<li class="listitem">
Operations that use <code class="computeroutput">null_buffers</code> are not supported.
</li>
<li class="listitem">
Only <code class="computeroutput">tcp::no_delay</code> and <code class="computeroutput">socket_base::keep_alive</code>
options are supported.
</li>
<li class="listitem">
Resolvers do not support service names, only numbers. I.e. you must
use "80" rather than "http".
</li>
<li class="listitem">
Most resolver query flags have no effect.
</li>
</ul></div>
</li>
<li class="listitem">
Fixed a regression (introduced in Boost 1.54) where, on some platforms,
errors from <code class="computeroutput">async_connect</code> were not correctly propagated through
to the completion handler (<a href="https://svn.boost.org/trac/boost/ticket/8795" target="_top">#8795</a>).
</li>
<li class="listitem">
Fixed a Windows-specific regression (introduced in Boost 1.54) that occurs
when multiple threads are running an <code class="computeroutput">io_service</code>. When the
bug occurs, the result of an asynchronous operation (error and bytes tranferred)
is incorrectly discarded and zero values used instead. For TCP sockets
this results in spurious end-of-file notifications (<a href="https://svn.boost.org/trac/boost/ticket/8933" target="_top">#8933</a>).
</li>
<li class="listitem">
Fixed a bug in handler tracking, where it was not correctly printing out
some handler IDs (<a href="https://svn.boost.org/trac/boost/ticket/8808" target="_top">#8808</a>).
</li>
<li class="listitem">
Fixed the comparison used to test for successful synchronous accept operations
so that it works correctly with unsigned socket descriptors (<a href="https://svn.boost.org/trac/boost/ticket/8752" target="_top">#8752</a>).
</li>
<li class="listitem">
Ensured the signal number is correctly passed to the completion handler
when starting an <code class="computeroutput">async_wait</code> on a signal that is already raised
(<a href="https://svn.boost.org/trac/boost/ticket/8738" target="_top">#8738</a>).
</li>
<li class="listitem">
Suppressed a g++ 4.8+ warning about unused typedefs (<a href="https://svn.boost.org/trac/boost/ticket/8980" target="_top">#8980</a>).
</li>
<li class="listitem">
Enabled the move optimisation for handlers that use the default invocation
hook (<a href="https://svn.boost.org/trac/boost/ticket/8624" target="_top">#8624</a>).
</li>
<li class="listitem">
Clarified that programs must not issue overlapping <code class="computeroutput">async_write_at</code>
operations (<a href="https://svn.boost.org/trac/boost/ticket/8669" target="_top">#8669</a>).
</li>
<li class="listitem">
Changed the Windows <code class="computeroutput">HANDLE</code> backend to treat <code class="computeroutput">ERROR_MORE_DATA</code>
as a non-fatal error when returned by <code class="computeroutput">GetOverlappedResult</code>
for a synchronous read (<a href="https://svn.boost.org/trac/boost/ticket/8722" target="_top">#8722</a>).
</li>
<li class="listitem">
Visual C++ language extensions use <code class="computeroutput">generic</code> as a keyword. Added
a workaround that renames the namespace to <code class="computeroutput">cpp_generic</code> when
those language extensions are in effect.
</li>
<li class="listitem">
Fixed some asynchronous operations that missed out on getting <code class="computeroutput">async_result</code>
support in Boost 1.54. In particular, the buffered stream templates have
been updated so that they adhere to current handler patterns (<a href="https://svn.boost.org/trac/boost/ticket/9000" target="_top">#9000</a>,
<a href="https://svn.boost.org/trac/boost/ticket/9001" target="_top">#9001</a>).
</li>
<li class="listitem">
Enabled move support for Microsoft Visual Studio 2012 (<a href="https://svn.boost.org/trac/boost/ticket/8959" target="_top">#8959</a>).
</li>
<li class="listitem">
Added <code class="computeroutput">use_future</code> support for Microsoft Visual Studio 2012.
</li>
<li class="listitem">
Removed a use of <code class="computeroutput">std::min</code> in the Windows IOCP backend to avoid
a dependency on the <code class="computeroutput"><algorithm></code> header (<a href="https://svn.boost.org/trac/boost/ticket/8758" target="_top">#8758</a>).
</li>
<li class="listitem">
Eliminated some unnecessary handler copies.
</li>
<li class="listitem">
Fixed support for older versions of OpenSSL that do not provide the <code class="computeroutput">SSL_CTX_clear_options</code>
function (<a href="https://svn.boost.org/trac/boost/ticket/9273" target="_top">#9273</a>).
</li>
<li class="listitem">
Fixed various minor and cosmetic issues in code and documentation (including
<a href="https://svn.boost.org/trac/boost/ticket/8347" target="_top">#8347</a>, <a href="https://svn.boost.org/trac/boost/ticket/8950" target="_top">#8950</a>, <a href="https://svn.boost.org/trac/boost/ticket/8953" target="_top">#8953</a>, <a href="https://svn.boost.org/trac/boost/ticket/8965" target="_top">#8965</a>, <a href="https://svn.boost.org/trac/boost/ticket/8997" target="_top">#8997</a>, <a href="https://svn.boost.org/trac/boost/ticket/9230" target="_top">#9230</a>).
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h13"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_10_0___boost_1_54"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_10_0___boost_1_54">Asio
1.10.0 / Boost 1.54</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Added new traits classes, <code class="computeroutput">handler_type</code> and <code class="computeroutput">async_result</code>,
that allow the customisation of the return type of an initiating function.
</li>
<li class="listitem">
Added the <code class="computeroutput">asio::spawn()</code> function, a high-level wrapper for
running stackful coroutines, based on the Boost.Coroutine library. The
<code class="computeroutput">spawn()</code> function enables programs to implement asynchronous
logic in a synchronous manner. For example: <code class="computeroutput">size_t n = my_socket.async_read_some(my_buffer,
yield);</code>. For further information, see <a class="link" href="overview/core/spawn.html" title="Stackful Coroutines">Stackful
Coroutines</a>.
</li>
<li class="listitem">
Added the <code class="computeroutput">asio::use_future</code> special value, which provides first-class
support for returning a C++11 <code class="computeroutput">std::future</code> from an asynchronous
operation's initiating function. For example: <code class="computeroutput">future<size_t>
= my_socket.async_read_some(my_buffer, asio::use_future);</code>. For further
information, see <a class="link" href="overview/cpp2011/futures.html" title="Futures">C++
2011 Support - Futures</a>.
</li>
<li class="listitem">
Promoted the stackless coroutine class and macros to be part of Asio's
documented interface, rather than part of the HTTP server 4 example. For
further information, see <a class="link" href="overview/core/coroutine.html" title="Stackless Coroutines">Stackless
Coroutines</a>.
</li>
<li class="listitem">
Added a new handler hook called <code class="computeroutput">asio_handler_is_continuation</code>.
Asynchronous operations may represent a continuation of the asynchronous
control flow associated with the current executing handler. The <code class="computeroutput">asio_handler_is_continuation</code>
hook can be customised to return <code class="computeroutput">true</code> if this is the case,
and Asio's implementation can use this knowledge to optimise scheduling
of the new handler. To cover common cases, Asio customises the hook for
strands, <code class="computeroutput">spawn()</code> and composed asynchronous operations.
</li>
<li class="listitem">
Added four new generic protocol classes, <code class="computeroutput">generic::datagram_protocol</code>,
<code class="computeroutput">generic::raw_protocol</code>, <code class="computeroutput">generic::seq_packet_protocol</code>
and <code class="computeroutput">generic::stream_protocol</code>, which implement the <code class="computeroutput">Protocol</code>
type requirements, but allow the user to specify the address family (e.g.
<code class="computeroutput">AF_INET</code>) and protocol type (e.g. <code class="computeroutput">IPPROTO_TCP</code>)
at runtime. For further information, see <a class="link" href="overview/networking/other_protocols.html" title="Support for Other Protocols">Support
for Other Protocols</a>.
</li>
<li class="listitem">
Added C++11 move constructors that allow the conversion of a socket (or
acceptor) into a more generic type. For example, an <code class="computeroutput">ip::tcp::socket</code>
can be converted into a <code class="computeroutput">generic::stream_protocol::socket</code> via
move construction. For further information, see <a class="link" href="overview/networking/other_protocols.html" title="Support for Other Protocols">Support
for Other Protocols</a>.
</li>
<li class="listitem">
Extended the <code class="computeroutput">basic_socket_acceptor<></code>'s <code class="computeroutput">accept()</code>
and <code class="computeroutput">async_accept()</code> functions to allow a new connection to
be accepted directly into a socket of a more generic type. For example,
an <code class="computeroutput">ip::tcp::acceptor</code> can be used to accept into a <code class="computeroutput">generic::stream_protocol::socket</code>
object. For further information, see <a class="link" href="overview/networking/other_protocols.html" title="Support for Other Protocols">Support
for Other Protocols</a>.
</li>
<li class="listitem">
Moved existing examples into a C++03-specific directory, and added a new
directory for C++11-specific examples. A limited subset of the C++03 examples
have been converted to their C++11 equivalents.
</li>
<li class="listitem">
Various SSL enhancements. Thanks go to Nick Jones, on whose work these
changes are based.
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; ">
<li class="listitem">
Added support for SSL handshakes with re-use of data already read
from the wire. New overloads of the <code class="computeroutput">ssl::stream<></code>
class's <code class="computeroutput">handshake()</code> and <code class="computeroutput">async_handshake()</code>
functions have been added. These accept a <code class="computeroutput">ConstBufferSequence</code>
to be used as initial input to the ssl engine for the handshake procedure.
</li>
<li class="listitem">
Added support for creation of TLSv1.1 and TLSv1.2 <code class="computeroutput">ssl::context</code>
objects.
</li>
<li class="listitem">
Added a <code class="computeroutput">set_verify_depth()</code> function to the <code class="computeroutput">ssl::context</code>
and <code class="computeroutput">ssl::stream<></code> classes.
</li>
<li class="listitem">
Added the ability to load SSL certificate and key data from memory
buffers. New functions, <code class="computeroutput">add_certificate_authority()</code>,
<code class="computeroutput">use_certificate()</code>, <code class="computeroutput">use_certificate_chain()</code>,
<code class="computeroutput">use_private_key()</code>, <code class="computeroutput">use_rsa_private_key()</code>
and <code class="computeroutput">use_tmp_dh()</code>, have been added to the <code class="computeroutput">ssl::context</code>
class.
</li>
<li class="listitem">
Changed <code class="computeroutput">ssl::context</code> to automatically disable SSL compression
by default. To enable, use the new <code class="computeroutput">ssl::context::clear_options()</code>
function, as in <code class="computeroutput">my_context.clear_options(ssl::context::no_compression)</code>.
</li>
</ul></div>
</li>
<li class="listitem">
Fixed a potential deadlock in <code class="computeroutput">signal_set</code> implementation.
</li>
<li class="listitem">
Fixed an error in acceptor example in documentation <a href="https://svn.boost.org/trac/boost/ticket/8421" target="_top">#8421</a>.
</li>
<li class="listitem">
Fixed copy-paste errors in waitable timer documentation <a href="https://svn.boost.org/trac/boost/ticket/8602" target="_top">#8602</a>.
</li>
<li class="listitem">
Added assertions to satisfy some code analysis tools <a href="https://svn.boost.org/trac/boost/ticket/7739" target="_top">#7739</a>.
</li>
<li class="listitem">
Fixed a malformed <code class="computeroutput">#warning</code> directive <a href="https://svn.boost.org/trac/boost/ticket/7939" target="_top">#7939</a>.
</li>
<li class="listitem">
Fixed a potential data race in the Linux <code class="computeroutput">epoll</code> implementation.
</li>
<li class="listitem">
Fixed a Windows-specific bug, where certain operations might generate an
<code class="computeroutput">error_code</code> with an invalid (i.e. <code class="computeroutput">NULL</code>) <code class="computeroutput">error_category</code>
<a href="https://svn.boost.org/trac/boost/ticket/8613" target="_top">#8613</a>.
</li>
<li class="listitem">
Fixed <code class="computeroutput">basic_waitable_timer</code>'s underlying implementation so
that it can handle any <code class="computeroutput">time_point</code> value without overflowing
the intermediate duration objects.
</li>
<li class="listitem">
Fixed a problem with lost thread wakeups that can occur when making concurrent
calls to <code class="computeroutput">run()</code> and <code class="computeroutput">poll()</code> on the same <code class="computeroutput">io_service</code>
object <a href="https://svn.boost.org/trac/boost/ticket/8354" target="_top">#8354</a>.
</li>
<li class="listitem">
Fixed implementation of asynchronous connect operation so that it can cope
with spurious readiness notifications from the reactor <a href="https://svn.boost.org/trac/boost/ticket/7961" target="_top">#7961</a>.
</li>
<li class="listitem">
Fixed a memory leak in the <code class="computeroutput">ssl::rfc2818_verification</code> class.
</li>
<li class="listitem">
Added a mechanism for disabling automatic Winsock initialisation <a href="https://svn.boost.org/trac/boost/ticket/3605" target="_top">#3605</a>.
See the header file <code class="literal">boost/asio/detail/winsock_init.hpp</code>
for details.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h14"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_8_3___boost_1_53"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_8_3___boost_1_53">Asio
1.8.3 / Boost 1.53</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Fixed some 64-to-32-bit conversion warnings (<a href="https://svn.boost.org/trac/boost/ticket/7459" target="_top">#7459</a>).
</li>
<li class="listitem">
Fixed some small errors in documentation and comments (<a href="https://svn.boost.org/trac/boost/ticket/7761" target="_top">#7761</a>).
</li>
<li class="listitem">
Fixed an error in the example embedded in <code class="computeroutput">basic_socket::get_option</code>'s
documentation (<a href="https://svn.boost.org/trac/boost/ticket/7562" target="_top">#7562</a>).
</li>
<li class="listitem">
Changed to use <code class="computeroutput">long</code> rather than <code class="computeroutput">int</code> for SSL_CTX
options, to match OpenSSL (<a href="https://svn.boost.org/trac/boost/ticket/7209" target="_top">#7209</a>).
</li>
<li class="listitem">
Changed to use <code class="computeroutput">_snwprintf</code> to address a compile error due to
the changed <code class="computeroutput">swprintf</code> signature in recent versions of MinGW
(<a href="https://svn.boost.org/trac/boost/ticket/7373" target="_top">#7373</a>).
</li>
<li class="listitem">
Fixed a deadlock that can occur on Windows when shutting down a pool of
<code class="computeroutput">io_service</code> threads due to running out of work (<a href="https://svn.boost.org/trac/boost/ticket/7552" target="_top">#7552</a>).
</li>
<li class="listitem">
Enabled the <code class="computeroutput">noexcept</code> qualifier for error categories (<a href="https://svn.boost.org/trac/boost/ticket/7797" target="_top">#7797</a>).
</li>
<li class="listitem">
Changed UNIX domain socket example to treat errors from <code class="computeroutput">accept</code>
as non-fatal (<a href="https://svn.boost.org/trac/boost/ticket/7488" target="_top">#7488</a>).
</li>
<li class="listitem">
Added a small block recycling optimisation to improve default memory allocation
behaviour.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h15"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_8_2___boost_1_51"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_8_2___boost_1_51">Asio
1.8.2 / Boost 1.51</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Fixed an incompatibility between <code class="computeroutput">ip::tcp::iostream</code> and C++11
(<a href="https://svn.boost.org/trac/boost/ticket/7162" target="_top">#7162</a>).
</li>
<li class="listitem">
Decorated GCC attribute names with underscores to prevent interaction with
user-defined macros (<a href="https://svn.boost.org/trac/boost/ticket/6415" target="_top">#6415</a>).
</li>
<li class="listitem">
Added missing <code class="computeroutput">#include <cctype></code>, needed for some versions
of MinGW.
</li>
<li class="listitem">
Changed to use <code class="literal">gcc</code>'s atomic builtins on ARM CPUs, when
available (<a href="https://svn.boost.org/trac/boost/ticket/7140" target="_top">#7140</a>).
</li>
<li class="listitem">
Changed strand destruction to be a no-op, to allow strand objects to be
destroyed after their associated <code class="computeroutput">io_service</code> has been destroyed.
</li>
<li class="listitem">
Added support for some newer versions of glibc which provide the <code class="computeroutput">epoll_create1()</code>
function but always fail with <code class="computeroutput">ENOSYS</code> (<a href="https://svn.boost.org/trac/boost/ticket/7012" target="_top">#7012</a>).
</li>
<li class="listitem">
Changed the SSL implementation to throw an exception if SSL engine initialisation
fails (<a href="https://svn.boost.org/trac/boost/ticket/6303" target="_top">#6303</a>).
</li>
<li class="listitem">
Fixed another regression in <code class="computeroutput">buffered_write_stream</code> (<a href="https://svn.boost.org/trac/boost/ticket/6310" target="_top">#6310</a>).
</li>
<li class="listitem">
Implemented various minor performance improvements, primarily targeted
at Linux x86 and x86-64 platforms.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h16"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_8_1___boost_1_50"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_8_1___boost_1_50">Asio
1.8.1 / Boost 1.50</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Changed the <code class="computeroutput">epoll_reactor</code> backend to do lazy registration
for <code class="computeroutput">EPOLLOUT</code> events.
</li>
<li class="listitem">
Fixed the <code class="computeroutput">epoll_reactor</code> handling of out-of-band data, which
was broken by an incomplete fix in the last release.
</li>
<li class="listitem">
Changed Asio's SSL wrapper to respect OpenSSL's <code class="computeroutput">OPENSSL_NO_ENGINE</code>
feature test <code class="computeroutput">#define</code> (<a href="https://svn.boost.org/trac/boost/ticket/6432" target="_top">#6432</a>).
</li>
<li class="listitem">
Fixed <code class="computeroutput">windows::object_handle</code> so that it works with Windows
compilers that support C++11 move semantics (such as <code class="literal">g++</code>).
</li>
<li class="listitem">
Improved the performance of strand rescheduling.
</li>
<li class="listitem">
Added support for <code class="literal">g++</code> 4.7 when compiling in C++11 mode
(<a href="https://svn.boost.org/trac/boost/ticket/6620" target="_top">#6620</a>).
</li>
<li class="listitem">
Fixed a problem where <code class="computeroutput">signal_set</code> handlers were not being delivered
when the <code class="computeroutput">io_service</code> was constructed with a <code class="computeroutput">concurrency_hint</code>
of 1 (<a href="https://svn.boost.org/trac/boost/ticket/6657" target="_top">#6657</a>).
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h17"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_8_0___boost_1_49"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_8_0___boost_1_49">Asio
1.8.0 / Boost 1.49</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Added a new class template <code class="computeroutput">basic_waitable_timer</code> based around
the C++11 clock type requirements. It may be used with the clocks from
the C++11 <code class="computeroutput"><chrono></code> library facility or, if those are
not available, Boost.Chrono. The typedefs <code class="computeroutput">high_resolution_timer</code>,
<code class="computeroutput">steady_timer</code> and <code class="computeroutput">system_timer</code> may be used to
create timer objects for the standard clock types.
</li>
<li class="listitem">
Added a new <code class="computeroutput">windows::object_handle</code> class for performing waits
on Windows kernel objects. Thanks go to Boris Schaeling for contributing
substantially to the development of this feature.
</li>
<li class="listitem">
On Linux, <code class="computeroutput">connect()</code> can return EAGAIN in certain circumstances.
Remapped this to another error so that it doesn't look like a non-blocking
operation (<a href="https://svn.boost.org/trac/boost/ticket/6048" target="_top">#6048</a>).
</li>
<li class="listitem">
Fixed a compile error on NetBSD (<a href="https://svn.boost.org/trac/boost/ticket/6098" target="_top">#6098</a>).
</li>
<li class="listitem">
Fixed deadlock on Mac OS X (<a href="https://svn.boost.org/trac/boost/ticket/6275" target="_top">#6275</a>).
</li>
<li class="listitem">
Fixed a regression in <code class="computeroutput">buffered_write_stream</code> (<a href="https://svn.boost.org/trac/boost/ticket/6310" target="_top">#6310</a>).
</li>
<li class="listitem">
Fixed a non-paged pool "leak" on Windows when an <code class="computeroutput">io_service</code>
is repeatedly run without anything to do (<a href="https://svn.boost.org/trac/boost/ticket/6321" target="_top">#6321</a>).
</li>
<li class="listitem">
Reverted earlier change to allow some speculative operations to be performed
without holding the lock, as it introduced a race condition in some multithreaded
scenarios.
</li>
<li class="listitem">
Fixed a bug where the second buffer in an array of two buffers may be ignored
if the first buffer is empty.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h18"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_6_1___boost_1_48"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_6_1___boost_1_48">Asio
1.6.1 / Boost 1.48</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Implemented various performance improvements, including:
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: circle; ">
<li class="listitem">
Using thread-local operation queues in single-threaded use cases
(i.e. when <code class="computeroutput">concurrency_hint</code> is 1) to eliminate a lock/unlock
pair.
</li>
<li class="listitem">
Allowing some <code class="computeroutput">epoll_reactor</code> speculative operations to
be performed without holding the lock.
</li>
<li class="listitem">
Improving locality of reference by performing an <code class="computeroutput">epoll_reactor</code>'s
I/O operation immediately before the corresponding handler is called.
This also improves scalability across CPUs when multiple threads
are running the <code class="computeroutput">io_service</code>.
</li>
<li class="listitem">
Specialising asynchronous read and write operations for buffer sequences
that are arrays (<code class="computeroutput">boost::array</code> or <code class="computeroutput">std::array</code>)
of exactly two buffers.
</li>
</ul></div>
</li>
<li class="listitem">
Fixed a compile error in the regex overload of <code class="computeroutput">async_read_until</code>
(<a href="https://svn.boost.org/trac/boost/ticket/5688" target="_top">#5688</a>).
</li>
<li class="listitem">
Fixed a Windows-specific compile error by explicitly specifying the <code class="computeroutput">signal()</code>
function from the global namespace (<a href="https://svn.boost.org/trac/boost/ticket/5722" target="_top">#5722</a>).
</li>
<li class="listitem">
Changed the <code class="computeroutput">deadline_timer</code> implementation so that it does
not read the clock unless the timer heap is non-empty.
</li>
<li class="listitem">
Changed the SSL stream's buffers' sizes so that they are large enough to
hold a complete TLS record (<a href="https://svn.boost.org/trac/boost/ticket/5854" target="_top">#5854</a>).
</li>
<li class="listitem">
Fixed the behaviour of the synchronous <code class="computeroutput">null_buffers</code> operations
so that they obey the user's non-blocking setting (<a href="https://svn.boost.org/trac/boost/ticket/5756" target="_top">#5756</a>).
</li>
<li class="listitem">
Changed to set the size of the select <code class="computeroutput">fd_set</code> at runtime when
using Windows.
</li>
<li class="listitem">
Disabled an MSVC warning due to const qualifier being applied to function
type.
</li>
<li class="listitem">
Fixed a crash that occurs when using the Intel C++ compiler (<a href="https://svn.boost.org/trac/boost/ticket/5763" target="_top">#5763</a>).
</li>
<li class="listitem">
Changed the initialisation of the OpenSSL library so that it supports all
available algorithms.
</li>
<li class="listitem">
Fixed the SSL error mapping used when the session is gracefully shut down.
</li>
<li class="listitem">
Added some latency test programs.
</li>
<li class="listitem">
Clarified that a read operation ends when the buffer is full (<a href="https://svn.boost.org/trac/boost/ticket/5999" target="_top">#5999</a>).
</li>
<li class="listitem">
Fixed an exception safety issue in <code class="computeroutput">epoll_reactor</code> initialisation
(<a href="https://svn.boost.org/trac/boost/ticket/6006" target="_top">#6006</a>).
</li>
<li class="listitem">
Made the number of strand implementations configurable by defining <code class="computeroutput">BOOST_ASIO_STRAND_IMPLEMENTATIONS</code>
to the desired number.
</li>
<li class="listitem">
Added support for a new <code class="computeroutput">BOOST_ASIO_ENABLE_SEQUENTIAL_STRAND_ALLOCATION</code>
flag which switches the allocation of strand implementations to use a round-robin
approach rather than hashing.
</li>
<li class="listitem">
Fixed potential strand starvation issue that can occur when <code class="computeroutput">strand.post()</code>
is used.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h19"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_6_0___boost_1_47"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_6_0___boost_1_47">Asio
1.6.0 / Boost 1.47</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Added support for signal handling, using a new class called <code class="computeroutput">signal_set</code>.
Programs may add one or more signals to the set, and then perform an <code class="computeroutput">async_wait()</code>
operation. The specified handler will be called when one of the signals
occurs. The same signal number may be registered with multiple <code class="computeroutput">signal_set</code>
objects, however the signal number must be used only with Asio. Addresses
<a href="https://svn.boost.org/trac/boost/ticket/2879" target="_top">#2879</a>.
</li>
<li class="listitem">
Added handler tracking, a new debugging aid. When enabled by defining
<code class="computeroutput">BOOST_ASIO_ENABLE_HANDLER_TRACKING</code>, Asio writes debugging
output to the standard error stream. The output records asynchronous operations
and the relationships between their handlers. It may be post-processed
using the included <code class="literal">handlerviz.pl</code> tool to create a visual
representation of the handlers (requires GraphViz).
</li>
<li class="listitem">
Added support for timeouts on socket iostreams, such as <code class="computeroutput">ip::tcp::iostream</code>.
A timeout is set by calling <code class="computeroutput">expires_at()</code> or <code class="computeroutput">expires_from_now()</code>
to establish a deadline. Any socket operations which occur past the deadline
will put the iostream into a bad state.
</li>
<li class="listitem">
Added a new <code class="computeroutput">error()</code> member function to socket iostreams, for
retrieving the error code from the most recent system call.
</li>
<li class="listitem">
Added a new <code class="computeroutput">basic_deadline_timer::cancel_one()</code> function. This
function lets you cancel a single waiting handler on a timer. Handlers
are cancelled in FIFO order.
</li>
<li class="listitem">
Added a new <code class="computeroutput">transfer_exactly()</code> completion condition. This
can be used to send or receive a specified number of bytes even if the
total size of the buffer (or buffer sequence) is larger.
</li>
<li class="listitem">
Added new free functions <code class="computeroutput">connect()</code> and <code class="computeroutput">async_connect()</code>.
These operations try each endpoint in a list until the socket is successfully
connected, and are useful for creating TCP clients that work with both
IPv4 and IPv6.
</li>
<li class="listitem">
Extended the <code class="computeroutput">buffer_size()</code> function so that it works for buffer
sequences in addition to individual buffers.
</li>
<li class="listitem">
Added a new <code class="computeroutput">buffer_copy()</code> function that can be used to copy
the raw bytes between individual buffers and buffer sequences.
</li>
<li class="listitem">
Added new non-throwing overloads of <code class="computeroutput">read()</code>, <code class="computeroutput">read_at()</code>,
<code class="computeroutput">write()</code> and <code class="computeroutput">write_at()</code> that do not require a
completion condition.
</li>
<li class="listitem">
Added friendlier compiler errors for when a completion handler does not
meet the necessary type requirements. When C++0x is available (currently
supported for <code class="literal">g++</code> 4.5 or later, and MSVC 10), <code class="computeroutput">static_assert</code>
is also used to generate an informative error message. This checking may
be disabled by defining <code class="computeroutput">BOOST_ASIO_DISABLE_HANDLER_TYPE_REQUIREMENTS</code>.
</li>
<li class="listitem">
Added a new, completely rewritten SSL implementation. The new implementation
compiles faster, shows substantially improved performance, and supports
custom memory allocation and handler invocation. It includes new API features
such as certificate verification callbacks and has improved error reporting.
The new implementation is source-compatible with the old for most uses.
However, if necessary, the old implementation may still be used by defining
<code class="computeroutput">BOOST_ASIO_ENABLE_OLD_SSL</code>. Addresses <a href="https://svn.boost.org/trac/boost/ticket/3702" target="_top">#3702</a>,
<a href="https://svn.boost.org/trac/boost/ticket/3958" target="_top">#3958</a>.
</li>
<li class="listitem">
Changed the separate compilation support such that, to use Asio's SSL capabilities,
you should also include <code class="computeroutput">boost/asio/ssl/impl/src.hpp</code> in one
source file in your program.
</li>
<li class="listitem">
Changed the SSL implementation to support build environments where SSL
v2 is explicitly disabled (<a href="https://svn.boost.org/trac/boost/ticket/5453" target="_top">#5453</a>).
</li>
<li class="listitem">
Made the <code class="computeroutput">is_loopback()</code>, <code class="computeroutput">is_unspecified()</code> and
<code class="computeroutput">is_multicast()</code> functions consistently available across the
<code class="computeroutput">ip::address</code>, <code class="computeroutput">ip::address_v4</code> and <code class="computeroutput">ip::address_v6</code>
classes (<a href="https://svn.boost.org/trac/boost/ticket/3939" target="_top">#3939</a>).
</li>
<li class="listitem">
Added new <code class="computeroutput">non_blocking()</code> functions for managing the non-blocking
behaviour of a socket or descriptor. The <code class="computeroutput">io_control()</code> commands
named <code class="computeroutput">non_blocking_io</code> are now deprecated in favour of these
new functions.
</li>
<li class="listitem">
Added new <code class="computeroutput">native_non_blocking()</code> functions for managing the
non-blocking mode of the underlying socket or descriptor. These functions
are intended to allow the encapsulation of arbitrary non-blocking system
calls as asynchronous operations, in a way that is transparent to the user
of the socket object. The functions have no effect on the behaviour of
the synchronous operations of the socket or descriptor.
</li>
<li class="listitem">
Added the <code class="computeroutput">io_control()</code> member function for socket acceptors
(<a href="https://svn.boost.org/trac/boost/ticket/3297" target="_top">#3297</a>).
</li>
<li class="listitem">
Added a <code class="computeroutput">release()</code> member function to posix descriptors. This
function releases ownership of the underlying native descriptor to the
caller. Addresses <a href="https://svn.boost.org/trac/boost/ticket/3900" target="_top">#3900</a>.
</li>
<li class="listitem">
Added support for sequenced packet sockets (<code class="computeroutput">SOCK_SEQPACKET</code>).
</li>
<li class="listitem">
Added a new <code class="computeroutput">io_service::stopped()</code> function that can be used
to determine whether the <code class="computeroutput">io_service</code> has stopped (i.e. a <code class="computeroutput">reset()</code>
call is needed prior to any further calls to <code class="computeroutput">run()</code>, <code class="computeroutput">run_one()</code>,
<code class="computeroutput">poll()</code> or <code class="computeroutput">poll_one()</code>).
</li>
<li class="listitem">
For consistency with the C++0x standard library, deprecated the <code class="computeroutput">native_type</code>
typedefs in favour of <code class="computeroutput">native_handle_type</code>, and the <code class="computeroutput">native()</code>
member functions in favour of <code class="computeroutput">native_handle()</code>.
</li>
<li class="listitem">
Added support for C++0x move construction and assignment to sockets, serial
ports, POSIX descriptors and Windows handles.
</li>
<li class="listitem">
Reduced the copying of handler function objects.
</li>
<li class="listitem">
Added support for C++0x move construction to further reduce (and in some
cases eliminate) copying of handler objects.
</li>
<li class="listitem">
Added support for the <code class="computeroutput">fork()</code> system call. Programs that use
<code class="computeroutput">fork()</code> must call <code class="computeroutput">io_service.notify_fork()</code> at
the appropriate times. Two new examples have been added showing how to
use this feature. Addresses <a href="https://svn.boost.org/trac/boost/ticket/3238" target="_top">#3238</a>,
<a href="https://svn.boost.org/trac/boost/ticket/4162" target="_top">#4162</a>.
</li>
<li class="listitem">
Cleaned up the handling of errors reported by the <code class="computeroutput">close()</code>
system call. In particular, assume that most operating systems won't have
<code class="computeroutput">close()</code> fail with <code class="computeroutput">EWOULDBLOCK</code>, but if it does
then set the blocking mode and restart the call. If any other error occurs,
assume the descriptor is closed. Addresses <a href="https://svn.boost.org/trac/boost/ticket/3307" target="_top">#3307</a>.
</li>
<li class="listitem">
Added new <code class="computeroutput">asio::buffer()</code> overloads for <code class="computeroutput">std::array</code>,
when available.
</li>
<li class="listitem">
Changed the implementation to use the C++0x standard library templates
<code class="computeroutput">array</code>, <code class="computeroutput">shared_ptr</code>, <code class="computeroutput">weak_ptr</code> and
<code class="computeroutput">atomic</code> when they are available, rather than the Boost equivalents.
</li>
<li class="listitem">
Use C++0x variadic templates when available, rather than generating function
overloads using Boost.Preprocessor.
</li>
<li class="listitem">
Changed exception reporting to include the function name in exception
<code class="computeroutput">what()</code> messages.
</li>
<li class="listitem">
Fixed insufficient initialisers warning with MinGW.
</li>
<li class="listitem">
Changed the <code class="computeroutput">shutdown_service()</code> member functions to be private.
</li>
<li class="listitem">
Added archetypes for testing socket option functions.
</li>
<li class="listitem">
Changed the Boost.Asio examples so that they don't use Boost.Thread's convenience
header. Use the header file that is specifically for the boost::thread
class instead.
</li>
<li class="listitem">
Removed the dependency on OS-provided macros for the well-known IPv4 and
IPv6 addresses. This should eliminate annoying "missing braces around
initializer" warnings (<a href="https://svn.boost.org/trac/boost/ticket/3741" target="_top">#3741</a>).
</li>
<li class="listitem">
Reduced the size of <code class="computeroutput">ip::basic_endpoint<></code> objects (such
as <code class="computeroutput">ip::tcp::endpoint</code> and <code class="computeroutput">ip::udp::endpoint</code>).
</li>
<li class="listitem">
Changed the reactor backends to assume that any descriptors or sockets
added using <code class="computeroutput">assign()</code> may have been <code class="computeroutput">dup()</code>-ed,
and so require explicit deregistration from the reactor (<a href="https://svn.boost.org/trac/boost/ticket/4971" target="_top">#4971</a>).
</li>
<li class="listitem">
Removed the deprecated member functions named <code class="computeroutput">io_service()</code>.
The <code class="computeroutput">get_io_service()</code> member functions should be used instead.
</li>
<li class="listitem">
Removed the deprecated typedefs <code class="computeroutput">resolver_query</code> and <code class="computeroutput">resolver_iterator</code>
from the <code class="computeroutput">ip::tcp</code>, <code class="computeroutput">ip::udp</code> and <code class="computeroutput">ip::icmp</code>
classes.
</li>
<li class="listitem">
Modified the <code class="computeroutput">buffers_iterator<></code> and <code class="computeroutput">ip::basic_resolver_iterator</code>
classes so that the value_type typedefs are non-const byte types.
</li>
<li class="listitem">
Fixed warnings reported by g++'s <code class="literal">-Wshadow</code> compiler option
(<a href="https://svn.boost.org/trac/boost/ticket/3905" target="_top">#3905</a>).
</li>
<li class="listitem">
Added an explicit cast to convert the <code class="computeroutput">FIONBIO</code> constant to
int, to suppress a compiler warning on some platforms (<a href="https://svn.boost.org/trac/boost/ticket/5128" target="_top">#5128</a>).
</li>
<li class="listitem">
Changed most examples to treat a failure by an accept operation as non-fatal
(<a href="https://svn.boost.org/trac/boost/ticket/5124" target="_top">#5124</a>).
</li>
<li class="listitem">
Fixed an error in the <code class="literal">tick_count_timer</code> example by making
the duration type signed. Previously, a wait on an already-passed deadline
would not return for a very long time (<a href="https://svn.boost.org/trac/boost/ticket/5418" target="_top">#5418</a>).
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h20"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_4_9___boost_1_46_1"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_4_9___boost_1_46_1">Asio
1.4.9 / Boost 1.46.1</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<code class="computeroutput">EV_ONESHOT</code> seems to cause problems on some versions of Mac
OS X, with the <code class="computeroutput">io_service</code> destructor getting stuck inside
the <code class="computeroutput">close()</code> system call. Changed the kqueue backend to use
<code class="computeroutput">EV_CLEAR</code> instead (<a href="https://svn.boost.org/trac/boost/ticket/5021" target="_top">#5021</a>).
</li>
<li class="listitem">
Fixed compile failures with some versions of <code class="literal">g++</code> due
to the use of anonymous enums (<a href="https://svn.boost.org/trac/boost/ticket/4883" target="_top">#4883</a>).
</li>
<li class="listitem">
Fixed a bug on kqueue-based platforms, where some system calls that repeatedly
fail with <code class="computeroutput">EWOULDBLOCK</code> are not correctly re-registered with
kqueue.
</li>
<li class="listitem">
Changed <code class="computeroutput">asio::streambuf</code> to ensure that its internal pointers
are updated correctly after the data has been modified using <code class="computeroutput">std::streambuf</code>
member functions.
</li>
<li class="listitem">
Fixed a bug that prevented the linger socket option from working on platforms
other than Windows.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h21"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_4_8___boost_1_46"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_4_8___boost_1_46">Asio
1.4.8 / Boost 1.46</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Fixed an integer overflow problem that occurs when <code class="computeroutput">ip::address_v4::broadcast()</code>
is used on 64-bit platforms.
</li>
<li class="listitem">
Fixed a problem on older Linux kernels (where epoll is used without timerfd
support) that prevents timely delivery of deadline_timer handlers, after
the program has been running for some time (<a href="https://svn.boost.org/trac/boost/ticket/5045" target="_top">#5045</a>).
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h22"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_4_7___boost_1_45"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_4_7___boost_1_45">Asio
1.4.7 / Boost 1.45</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Fixed a problem on kqueue-based platforms where a <code class="computeroutput">deadline_timer</code>
may never fire if the <code class="computeroutput">io_service</code> is running in a background
thread (<a href="https://svn.boost.org/trac/boost/ticket/4568" target="_top">#4568</a>).
</li>
<li class="listitem">
Fixed a const-correctness issue that prevented valid uses of <code class="computeroutput">has_service<></code>
from compiling (<a href="https://svn.boost.org/trac/boost/ticket/4638" target="_top">#4638</a>).
</li>
<li class="listitem">
Fixed MinGW cross-compilation (<a href="https://svn.boost.org/trac/boost/ticket/4491" target="_top">#4491</a>).
</li>
<li class="listitem">
Removed dependency on deprecated Boost.System functions (<a href="https://svn.boost.org/trac/boost/ticket/4672" target="_top">#4672</a>).
</li>
<li class="listitem">
Ensured <code class="computeroutput">close()</code>/<code class="computeroutput">closesocket()</code> failures are correctly
propagated (<a href="https://svn.boost.org/trac/boost/ticket/4573" target="_top">#4573</a>).
</li>
<li class="listitem">
Added a check for errors returned by <code class="computeroutput">InitializeCriticalSectionAndSpinCount</code>
(<a href="https://svn.boost.org/trac/boost/ticket/4574" target="_top">#4574</a>).
</li>
<li class="listitem">
Added support for hardware flow control on QNX (<a href="https://svn.boost.org/trac/boost/ticket/4625" target="_top">#4625</a>).
</li>
<li class="listitem">
Always use <code class="computeroutput">pselect()</code> on HP-UX, if it is available (<a href="https://svn.boost.org/trac/boost/ticket/4578" target="_top">#4578</a>).
</li>
<li class="listitem">
Ensured handler arguments are passed as lvalues (<a href="https://svn.boost.org/trac/boost/ticket/4744" target="_top">#4744</a>).
</li>
<li class="listitem">
Fixed Windows build when thread support is disabled (<a href="https://svn.boost.org/trac/boost/ticket/4680" target="_top">#4680</a>).
</li>
<li class="listitem">
Fixed a Windows-specific problem where <code class="computeroutput">deadline_timer</code> objects
with expiry times set more than 5 minutes in the future may never expire
(<a href="https://svn.boost.org/trac/boost/ticket/4745" target="_top">#4745</a>).
</li>
<li class="listitem">
Fixed the <code class="computeroutput">resolver</code> backend on BSD platforms so that an empty
service name resolves to port number <code class="computeroutput">0</code>, as per the documentation
(<a href="https://svn.boost.org/trac/boost/ticket/4690" target="_top">#4690</a>).
</li>
<li class="listitem">
Fixed read operations so that they do not accept buffer sequences of type
<code class="computeroutput">const_buffers_1</code> (<a href="https://svn.boost.org/trac/boost/ticket/4746" target="_top">#4746</a>).
</li>
<li class="listitem">
Redefined <code class="computeroutput">Protocol</code> and <code class="computeroutput">id</code> to avoid clashing with
Objective-C++ keywords (<a href="https://svn.boost.org/trac/boost/ticket/4191" target="_top">#4191</a>).
</li>
<li class="listitem">
Fixed a <code class="computeroutput">vector</code> reallocation performance issue that can occur
when there are many active <code class="computeroutput">deadline_timer</code> objects (<a href="https://svn.boost.org/trac/boost/ticket/4780" target="_top">#4780</a>).
</li>
<li class="listitem">
Fixed the kqueue backend so that it compiles on NetBSD (<a href="https://svn.boost.org/trac/boost/ticket/4662" target="_top">#4662</a>).
</li>
<li class="listitem">
Fixed the socket <code class="computeroutput">io_control()</code> implementation on 64-bit Mac
OS X and BSD platforms (<a href="https://svn.boost.org/trac/boost/ticket/4782" target="_top">#4782</a>).
</li>
<li class="listitem">
Fixed a Windows-specific problem where failures from <code class="computeroutput">accept()</code>
are incorrectly treated as successes (<a href="https://svn.boost.org/trac/boost/ticket/4859" target="_top">#4859</a>).
</li>
<li class="listitem">
Deprecated the separate compilation header <code class="computeroutput"><boost/asio/impl/src.cpp></code>
in favour of <code class="computeroutput"><boost/asio/impl/src.hpp></code> (<a href="https://svn.boost.org/trac/boost/ticket/4560" target="_top">#4560</a>).
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h23"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_4_6___boost_1_44"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_4_6___boost_1_44">Asio
1.4.6 / Boost 1.44</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Reduced compile times. (Note that some programs may need to add additional
<code class="computeroutput">#include</code>s, e.g. if the program uses <code class="computeroutput">boost::array</code>
but does not explicitly include <code class="computeroutput"><boost/array.hpp></code>.)
</li>
<li class="listitem">
Reduced the size of generated code.
</li>
<li class="listitem">
Refactored <code class="computeroutput">deadline_timer</code> implementation to improve performance.
</li>
<li class="listitem">
Improved multiprocessor scalability on Windows by using a dedicated hidden
thread to wait for timers.
</li>
<li class="listitem">
Improved performance of <code class="computeroutput">asio::streambuf</code> with <code class="computeroutput">async_read()</code>
and <code class="computeroutput">async_read_until()</code>. These read operations now use the
existing capacity of the <code class="computeroutput">streambuf</code> when reading, rather than
limiting the read to 512 bytes.
</li>
<li class="listitem">
Added optional separate compilation. To enable, add <code class="computeroutput">#include <boost/asio/impl/src.cpp></code>
to one source file in a program, then build the program with <code class="computeroutput">BOOST_ASIO_SEPARATE_COMPILATION</code>
defined in the project/compiler settings. Alternatively, <code class="computeroutput">BOOST_ASIO_DYN_LINK</code>
may be defined to build a separately-compiled Asio as part of a shared
library.
</li>
<li class="listitem">
Added new macro <code class="computeroutput">BOOST_ASIO_DISABLE_FENCED_BLOCK</code> to permit
the disabling of memory fences around completion handlers, even if thread
support is enabled.
</li>
<li class="listitem">
Reworked timeout examples to better illustrate typical use cases.
</li>
<li class="listitem">
Ensured that handler arguments are passed as <code class="computeroutput">const</code> types.
</li>
<li class="listitem">
Fixed incorrect parameter order in <code class="computeroutput">null_buffers</code> variant of
<code class="computeroutput">async_send_to</code> (<a href="https://svn.boost.org/trac/boost/ticket/4170" target="_top">#4170</a>).
</li>
<li class="listitem">
Ensured <code class="computeroutput">unsigned char</code> is used with <code class="computeroutput">isdigit</code> in
<code class="computeroutput">getaddrinfo</code> emulation (<a href="https://svn.boost.org/trac/boost/ticket/4201" target="_top">#4201</a>).
</li>
<li class="listitem">
Fixed handling of very small but non-zero timeouts (<a href="https://svn.boost.org/trac/boost/ticket/4205" target="_top">#4205</a>).
</li>
<li class="listitem">
Fixed crash that occurred when an empty buffer sequence was passed to a
composed read or write operation.
</li>
<li class="listitem">
Added missing <code class="computeroutput">operator+</code> overload in <code class="computeroutput">buffers_iterator</code>
(<a href="https://svn.boost.org/trac/boost/ticket/4382" target="_top">#4382</a>).
</li>
<li class="listitem">
Implemented cancellation of <code class="computeroutput">null_buffers</code> operations on Windows.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h24"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_4_5___boost_1_43"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_4_5___boost_1_43">Asio
1.4.5 / Boost 1.43</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Improved performance.
</li>
<li class="listitem">
Reduced compile times.
</li>
<li class="listitem">
Reduced the size of generated code.
</li>
<li class="listitem">
Extended the guarantee that background threads don't call user code to
all asynchronous operations (<a href="https://svn.boost.org/trac/boost/ticket/3923" target="_top">#3923</a>).
</li>
<li class="listitem">
Changed to use edge-triggered epoll on Linux.
</li>
<li class="listitem">
Changed to use <code class="computeroutput">timerfd</code> for dispatching timers on Linux, when
available.
</li>
<li class="listitem">
Changed to use one-shot notifications with kqueue on Mac OS X and BSD platforms.
</li>
<li class="listitem">
Added a bitmask type <code class="computeroutput">ip::resolver_query_base::flags</code> as per
the TR2 proposal. This type prevents implicit conversion from <code class="computeroutput">int</code>
to <code class="computeroutput">flags</code>, allowing the compiler to catch cases where users
incorrectly pass a numeric port number as the service name.
</li>
<li class="listitem">
Added <code class="computeroutput">#define NOMINMAX</code> for all Windows compilers. Users can
define <code class="computeroutput">BOOST_ASIO_NO_NOMINMAX</code> to suppress this definition
(<a href="https://svn.boost.org/trac/boost/ticket/3901" target="_top">#3901</a>).
</li>
<li class="listitem">
Fixed a bug where 0-byte asynchronous reads were incorrectly passing an
<code class="computeroutput">error::eof</code> result to the completion handler (<a href="https://svn.boost.org/trac/boost/ticket/4023" target="_top">#4023</a>).
</li>
<li class="listitem">
Changed the <code class="computeroutput">io_control()</code> member functions to always call
<code class="computeroutput">ioctl</code> on the underlying descriptor when modifying blocking
mode (<a href="https://svn.boost.org/trac/boost/ticket/3307" target="_top">#3307</a>).
</li>
<li class="listitem">
Changed the resolver implementation to longer require the typedefs <code class="computeroutput">InternetProtocol::resolver_query</code>
and <code class="computeroutput">InternetProtocol::resolver_iterator</code>, as neither typedef
is part of the documented <code class="computeroutput">InternetProtocol</code> requirements. The
corresponding typedefs in the <code class="computeroutput">ip::tcp</code>, <code class="computeroutput">ip::udp</code>
and <code class="computeroutput">ip::icmp</code> classes have been deprecated.
</li>
<li class="listitem">
Fixed out-of-band handling for reactors not based on <code class="computeroutput">select()</code>.
</li>
<li class="listitem">
Added new <code class="computeroutput">BOOST_ASIO_DISABLE_THREADS</code> macro that allows Asio's
threading support to be independently disabled.
</li>
<li class="listitem">
Minor documentation improvements.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h25"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_4_4___boost_1_42"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_4_4___boost_1_42">Asio
1.4.4 / Boost 1.42</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Added a new HTTP Server 4 example illustrating the use of stackless coroutines
with Asio.
</li>
<li class="listitem">
Changed handler allocation and invocation to use <code class="computeroutput">boost::addressof</code>
to get the address of handler objects, rather than applying <code class="computeroutput">operator&</code>
directly (<a href="https://svn.boost.org/trac/boost/ticket/2977" target="_top">#2977</a>).
</li>
<li class="listitem">
Restricted MSVC buffer debugging workaround to 2008, as it causes a crash
with 2010 beta 2 (<a href="https://svn.boost.org/trac/boost/ticket/3796" target="_top">#3796</a>,
<a href="https://svn.boost.org/trac/boost/ticket/3822" target="_top">#3822</a>).
</li>
<li class="listitem">
Fixed a problem with the lifetime of handler memory, where Windows needs
the <code class="computeroutput">OVERLAPPED</code> structure to be valid until both the initiating
function call has returned and the completion packet has been delivered.
</li>
<li class="listitem">
Don't block signals while performing system calls, but instead restart
the calls if they are interrupted.
</li>
<li class="listitem">
Documented the guarantee made by strand objects with respect to order of
handler invocation.
</li>
<li class="listitem">
Changed strands to use a pool of implementations, to make copying of strands
cheaper.
</li>
<li class="listitem">
Ensured that kqueue support is enabled for BSD platforms (<a href="https://svn.boost.org/trac/boost/ticket/3626" target="_top">#3626</a>).
</li>
<li class="listitem">
Added a <code class="computeroutput">boost_</code> prefix to the <code class="computeroutput">extern "C"</code>
thread entry point function (<a href="https://svn.boost.org/trac/boost/ticket/3809" target="_top">#3809</a>).
</li>
<li class="listitem">
In <code class="computeroutput">getaddrinfo</code> emulation, only check the socket type (<code class="computeroutput">SOCK_STREAM</code>
or <code class="computeroutput">SOCK_DGRAM</code>) if a service name has been specified. This
should allow the emulation to work with raw sockets.
</li>
<li class="listitem">
Added a workaround for some broken Windows firewalls that make a socket
appear bound to 0.0.0.0 when it is in fact bound to 127.0.0.1.
</li>
<li class="listitem">
Applied a fix for reported excessive CPU usage under Solaris (<a href="https://svn.boost.org/trac/boost/ticket/3670" target="_top">#3670</a>).
</li>
<li class="listitem">
Added some support for platforms that use older compilers such as g++ 2.95
(<a href="https://svn.boost.org/trac/boost/ticket/3743" target="_top">#3743</a>).
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h26"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_4_3___boost_1_40"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_4_3___boost_1_40">Asio
1.4.3 / Boost 1.40</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Added a new ping example to illustrate the use of ICMP sockets.
</li>
<li class="listitem">
Changed the <code class="computeroutput">buffered*_stream<></code> templates to treat 0-byte
reads and writes as no-ops, to comply with the documented type requirements
for <code class="computeroutput">SyncReadStream</code>, <code class="computeroutput">AsyncReadStream</code>, <code class="computeroutput">SyncWriteStream</code>
and <code class="computeroutput">AsyncWriteStream</code>.
</li>
<li class="listitem">
Changed some instances of the <code class="computeroutput">throw</code> keyword to <code class="computeroutput">boost::throw_exception()</code>
to allow Asio to be used when exception support is disabled. Note that
the SSL wrappers still require exception support (<a href="https://svn.boost.org/trac/boost/ticket/2754" target="_top">#2754</a>).
</li>
<li class="listitem">
Made Asio compatible with the OpenSSL 1.0 beta (<a href="https://svn.boost.org/trac/boost/ticket/3256" target="_top">#3256</a>).
</li>
<li class="listitem">
Eliminated a redundant system call in the Solaris <code class="literal">/dev/poll</code>
backend.
</li>
<li class="listitem">
Fixed a bug in resizing of the bucket array in the internal hash maps (<a href="https://svn.boost.org/trac/boost/ticket/3095" target="_top">#3095</a>).
</li>
<li class="listitem">
Ensured correct propagation of the error code when a synchronous accept
fails (<a href="https://svn.boost.org/trac/boost/ticket/3216" target="_top">#3216</a>).
</li>
<li class="listitem">
Ensured correct propagation of the error code when a synchronous read or
write on a Windows HANDLE fails.
</li>
<li class="listitem">
Fixed failures reported when <code class="computeroutput">_GLIBCXX_DEBUG</code> is defined (<a href="https://svn.boost.org/trac/boost/ticket/3098" target="_top">#3098</a>).
</li>
<li class="listitem">
Fixed custom memory allocation support for timers (<a href="https://svn.boost.org/trac/boost/ticket/3107" target="_top">#3107</a>).
</li>
<li class="listitem">
Tidied up various warnings reported by g++ (<a href="https://svn.boost.org/trac/boost/ticket/1341" target="_top">#1341</a>,
<a href="https://svn.boost.org/trac/boost/ticket/2618" target="_top">#2618</a>).
</li>
<li class="listitem">
Various documentation improvements, including more obvious hyperlinks to
function overloads, header file information, examples for the handler type
requirements, and adding enum values to the index (<a href="https://svn.boost.org/trac/boost/ticket/3157" target="_top">#3157</a>,
<a href="https://svn.boost.org/trac/boost/ticket/2620" target="_top">#2620</a>).
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h27"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_4_2___boost_1_39"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_4_2___boost_1_39">Asio
1.4.2 / Boost 1.39</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Implement automatic resizing of the bucket array in the internal hash maps.
This is to improve performance for very large numbers of asynchronous operations
and also to reduce memory usage for very small numbers. A new macro <code class="computeroutput">BOOST_ASIO_HASH_MAP_BUCKETS</code>
may be used to tweak the sizes used for the bucket arrays. (N.B. this feature
introduced a bug which was fixed in Asio 1.4.3 / Boost 1.40.)
</li>
<li class="listitem">
Add performance optimisation for the Windows IOCP backend for when no timers
are used.
</li>
<li class="listitem">
Prevent locale settings from affecting formatting of TCP and UDP endpoints
(<a href="https://svn.boost.org/trac/boost/ticket/2682" target="_top">#2682</a>).
</li>
<li class="listitem">
Fix a memory leak that occurred when an asynchronous SSL operation's completion
handler threw an exception (<a href="https://svn.boost.org/trac/boost/ticket/2910" target="_top">#2910</a>).
</li>
<li class="listitem">
Fix the implementation of <code class="computeroutput">io_control()</code> so that it adheres
to the documented type requirements for IoControlCommand (<a href="https://svn.boost.org/trac/boost/ticket/2820" target="_top">#2820</a>).
</li>
<li class="listitem">
Fix incompatibility between Asio and ncurses.h (<a href="https://svn.boost.org/trac/boost/ticket/2156" target="_top">#2156</a>).
</li>
<li class="listitem">
On Windows, specifically handle the case when an overlapped <code class="computeroutput">ReadFile</code>
call fails with <code class="computeroutput">ERROR_MORE_DATA</code>. This enables a hack where
a <code class="computeroutput">windows::stream_handle</code> can be used with a message-oriented
named pipe (<a href="https://svn.boost.org/trac/boost/ticket/2936" target="_top">#2936</a>).
</li>
<li class="listitem">
Fix system call wrappers to always clear the error on success, as POSIX
allows successful system calls to modify errno (<a href="https://svn.boost.org/trac/boost/ticket/2953" target="_top">#2953</a>).
</li>
<li class="listitem">
Don't include termios.h if <code class="computeroutput">BOOST_ASIO_DISABLE_SERIAL_PORT</code>
is defined (<a href="https://svn.boost.org/trac/boost/ticket/2917" target="_top">#2917</a>).
</li>
<li class="listitem">
Cleaned up some more MSVC level 4 warnings (<a href="https://svn.boost.org/trac/boost/ticket/2828" target="_top">#2828</a>).
</li>
<li class="listitem">
Various documentation fixes (<a href="https://svn.boost.org/trac/boost/ticket/2871" target="_top">#2871</a>).
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h28"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_4_1___boost_1_38"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_4_1___boost_1_38">Asio
1.4.1 / Boost 1.38</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Improved compatibility with some Windows firewall software.
</li>
<li class="listitem">
Ensured arguments to <code class="computeroutput">windows::overlapped_ptr::complete()</code> are
correctly passed to the completion handler (<a href="https://svn.boost.org/trac/boost/ticket/2614" target="_top">#2614</a>).
</li>
<li class="listitem">
Fixed a link problem and multicast failure on QNX (<a href="https://svn.boost.org/trac/boost/ticket/2504" target="_top">#2504</a>,
<a href="https://svn.boost.org/trac/boost/ticket/2530" target="_top">#2530</a>).
</li>
<li class="listitem">
Fixed a compile error in SSL support on MinGW / g++ 3.4.5.
</li>
<li class="listitem">
Drop back to using a pipe for notification if eventfd is not available
at runtime on Linux (<a href="https://svn.boost.org/trac/boost/ticket/2683" target="_top">#2683</a>).
</li>
<li class="listitem">
Various minor bug and documentation fixes (<a href="https://svn.boost.org/trac/boost/ticket/2534" target="_top">#2534</a>,
<a href="https://svn.boost.org/trac/boost/ticket/2541" target="_top">#2541</a>,
<a href="https://svn.boost.org/trac/boost/ticket/2607" target="_top">#2607</a>,
<a href="https://svn.boost.org/trac/boost/ticket/2617" target="_top">#2617</a>,
<a href="https://svn.boost.org/trac/boost/ticket/2619" target="_top">#2619</a>).
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h29"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_4_0___boost_1_37"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_4_0___boost_1_37">Asio
1.4.0 / Boost 1.37</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Enhanced CompletionCondition concept with the signature <code class="computeroutput">size_t CompletionCondition(error_code
ec, size_t total)</code>, where the return value indicates the maximum
number of bytes to be transferred on the next read or write operation.
(The old CompletionCondition signature is still supported for backwards
compatibility).
</li>
<li class="listitem">
New windows::overlapped_ptr class to allow arbitrary overlapped I/O functions
(such as TransmitFile) to be used with Asio.
</li>
<li class="listitem">
On recent versions of Linux, an eventfd descriptor is now used (rather
than a pipe) to interrupt a blocked select/epoll reactor.
</li>
<li class="listitem">
Added const overloads of lowest_layer().
</li>
<li class="listitem">
Synchronous read, write, accept and connect operations are now thread safe
(meaning that it is now permitted to perform concurrent synchronous operations
on an individual socket, if supported by the OS).
</li>
<li class="listitem">
Reactor-based io_service implementations now use lazy initialisation to
reduce the memory usage of an io_service object used only as a message
queue.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h30"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_2_0___boost_1_36"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_2_0___boost_1_36">Asio
1.2.0 / Boost 1.36</a>
</h4>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
Added support for serial ports.
</li>
<li class="listitem">
Added support for UNIX domain sockets.
</li>
<li class="listitem">
Added support for raw sockets and ICMP.
</li>
<li class="listitem">
Added wrappers for POSIX stream-oriented file descriptors (excluding regular
files).
</li>
<li class="listitem">
Added wrappers for Windows stream-oriented <code class="computeroutput">HANDLE</code>s such as
named pipes (requires <code class="computeroutput">HANDLE</code>s that work with I/O completion
ports).
</li>
<li class="listitem">
Added wrappers for Windows random-access <code class="computeroutput">HANDLE</code>s such as files
(requires <code class="computeroutput">HANDLE</code>s that work with I/O completion ports).
</li>
<li class="listitem">
Added support for reactor-style operations (i.e. they report readiness
but perform no I/O) using a new <code class="computeroutput">null_buffers</code> type.
</li>
<li class="listitem">
Added an iterator type for bytewise traversal of buffer sequences.
</li>
<li class="listitem">
Added new <code class="computeroutput">read_until()</code> and <code class="computeroutput">async_read_until()</code>
overloads that take a user-defined function object for locating message
boundaries.
</li>
<li class="listitem">
Added an experimental two-lock queue (enabled by defining <code class="computeroutput">BOOST_ASIO_ENABLE_TWO_LOCK_QUEUE</code>)
that may provide better <code class="computeroutput">io_service</code> scalability across many
processors.
</li>
<li class="listitem">
Various fixes, performance improvements, and more complete coverage of
the custom memory allocation support.
</li>
</ul></div>
<h4>
<a name="boost_asio.history.h31"></a>
<span class="phrase"><a name="boost_asio.history.asio_1_0_0___boost_1_35"></a></span><a class="link" href="history.html#boost_asio.history.asio_1_0_0___boost_1_35">Asio
1.0.0 / Boost 1.35</a>
</h4>
<p>
First release of Asio as part of Boost.
</p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2003-2018 Christopher M. Kohlhoff<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
</p>
</div></td>
</tr></table>
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