Imported Upstream version 1.49.0upstream/1.49.0

1 files changed, 526 insertions, 0 deletions

diff --git a/boost/asio/detail/impl/kqueue_reactor.ipp b/boost/asio/detail/impl/kqueue_reactor.ipp
new file mode 100644
index 0000000000..a819eb9b74
--- /dev/null
+++ b/boost/asio/detail/impl/kqueue_reactor.ipp
@@ -0,0 +1,526 @@
+//
+// detail/impl/kqueue_reactor.ipp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2012 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2005 Stefan Arentz (stefan at soze dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_ASIO_DETAIL_IMPL_KQUEUE_REACTOR_IPP
+#define BOOST_ASIO_DETAIL_IMPL_KQUEUE_REACTOR_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/config.hpp>
+
+#if defined(BOOST_ASIO_HAS_KQUEUE)
+
+#include <boost/asio/detail/kqueue_reactor.hpp>
+#include <boost/asio/detail/throw_error.hpp>
+#include <boost/asio/error.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+
+#if defined(__NetBSD__)
+# define BOOST_ASIO_KQUEUE_EV_SET(ev, ident, filt, flags, fflags, data, udata) \
+    EV_SET(ev, ident, filt, flags, fflags, data, \
+      reinterpret_cast<intptr_t>(static_cast<void*>(udata)))
+#else
+# define BOOST_ASIO_KQUEUE_EV_SET(ev, ident, filt, flags, fflags, data, udata) \
+    EV_SET(ev, ident, filt, flags, fflags, data, udata)
+#endif
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+kqueue_reactor::kqueue_reactor(boost::asio::io_service& io_service)
+  : boost::asio::detail::service_base<kqueue_reactor>(io_service),
+    io_service_(use_service<io_service_impl>(io_service)),
+    mutex_(),
+    kqueue_fd_(do_kqueue_create()),
+    interrupter_(),
+    shutdown_(false)
+{
+  // The interrupter is put into a permanently readable state. Whenever we want
+  // to interrupt the blocked kevent call we register a read operation against
+  // the descriptor.
+  interrupter_.interrupt();
+}
+
+kqueue_reactor::~kqueue_reactor()
+{
+  close(kqueue_fd_);
+}
+
+void kqueue_reactor::shutdown_service()
+{
+  mutex::scoped_lock lock(mutex_);
+  shutdown_ = true;
+  lock.unlock();
+
+  op_queue<operation> ops;
+
+  while (descriptor_state* state = registered_descriptors_.first())
+  {
+    for (int i = 0; i < max_ops; ++i)
+      ops.push(state->op_queue_[i]);
+    state->shutdown_ = true;
+    registered_descriptors_.free(state);
+  }
+
+  timer_queues_.get_all_timers(ops);
+
+  io_service_.abandon_operations(ops);
+}
+
+void kqueue_reactor::fork_service(boost::asio::io_service::fork_event fork_ev)
+{
+  if (fork_ev == boost::asio::io_service::fork_child)
+  {
+    // The kqueue descriptor is automatically closed in the child.
+    kqueue_fd_ = -1;
+    kqueue_fd_ = do_kqueue_create();
+
+    interrupter_.recreate();
+
+    // Re-register all descriptors with kqueue.
+    mutex::scoped_lock descriptors_lock(registered_descriptors_mutex_);
+    for (descriptor_state* state = registered_descriptors_.first();
+        state != 0; state = state->next_)
+    {
+      struct kevent events[2];
+      int num_events = 0;
+
+      if (!state->op_queue_[read_op].empty())
+        BOOST_ASIO_KQUEUE_EV_SET(&events[num_events++], state->descriptor_,
+            EVFILT_READ, EV_ADD | EV_CLEAR, 0, 0, state);
+      else if (!state->op_queue_[except_op].empty())
+        BOOST_ASIO_KQUEUE_EV_SET(&events[num_events++], state->descriptor_,
+            EVFILT_READ, EV_ADD | EV_CLEAR, EV_OOBAND, 0, state);
+
+      if (!state->op_queue_[write_op].empty())
+        BOOST_ASIO_KQUEUE_EV_SET(&events[num_events++], state->descriptor_,
+            EVFILT_WRITE, EV_ADD | EV_CLEAR, 0, 0, state);
+
+      if (num_events && ::kevent(kqueue_fd_, events, num_events, 0, 0, 0) == -1)
+      {
+        boost::system::error_code error(errno,
+            boost::asio::error::get_system_category());
+        boost::asio::detail::throw_error(error);
+      }
+    }
+  }
+}
+
+void kqueue_reactor::init_task()
+{
+  io_service_.init_task();
+}
+
+int kqueue_reactor::register_descriptor(socket_type descriptor,
+    kqueue_reactor::per_descriptor_data& descriptor_data)
+{
+  descriptor_data = allocate_descriptor_state();
+
+  mutex::scoped_lock lock(descriptor_data->mutex_);
+
+  descriptor_data->descriptor_ = descriptor;
+  descriptor_data->shutdown_ = false;
+
+  return 0;
+}
+
+int kqueue_reactor::register_internal_descriptor(
+    int op_type, socket_type descriptor,
+    kqueue_reactor::per_descriptor_data& descriptor_data, reactor_op* op)
+{
+  descriptor_data = allocate_descriptor_state();
+
+  mutex::scoped_lock lock(descriptor_data->mutex_);
+
+  descriptor_data->descriptor_ = descriptor;
+  descriptor_data->shutdown_ = false;
+  descriptor_data->op_queue_[op_type].push(op);
+
+  struct kevent event;
+  switch (op_type)
+  {
+  case read_op:
+    BOOST_ASIO_KQUEUE_EV_SET(&event, descriptor, EVFILT_READ,
+        EV_ADD | EV_CLEAR, 0, 0, descriptor_data);
+    break;
+  case write_op:
+    BOOST_ASIO_KQUEUE_EV_SET(&event, descriptor, EVFILT_WRITE,
+        EV_ADD | EV_CLEAR, 0, 0, descriptor_data);
+    break;
+  case except_op:
+    BOOST_ASIO_KQUEUE_EV_SET(&event, descriptor, EVFILT_READ,
+        EV_ADD | EV_CLEAR, EV_OOBAND, 0, descriptor_data);
+    break;
+  }
+  ::kevent(kqueue_fd_, &event, 1, 0, 0, 0);
+
+  return 0;
+}
+
+void kqueue_reactor::move_descriptor(socket_type,
+    kqueue_reactor::per_descriptor_data& target_descriptor_data,
+    kqueue_reactor::per_descriptor_data& source_descriptor_data)
+{
+  target_descriptor_data = source_descriptor_data;
+  source_descriptor_data = 0;
+}
+
+void kqueue_reactor::start_op(int op_type, socket_type descriptor,
+    kqueue_reactor::per_descriptor_data& descriptor_data,
+    reactor_op* op, bool allow_speculative)
+{
+  if (!descriptor_data)
+  {
+    op->ec_ = boost::asio::error::bad_descriptor;
+    post_immediate_completion(op);
+    return;
+  }
+
+  mutex::scoped_lock descriptor_lock(descriptor_data->mutex_);
+
+  if (descriptor_data->shutdown_)
+  {
+    post_immediate_completion(op);
+    return;
+  }
+
+  bool first = descriptor_data->op_queue_[op_type].empty();
+  if (first)
+  {
+    if (allow_speculative)
+    {
+      if (op_type != read_op || descriptor_data->op_queue_[except_op].empty())
+      {
+        if (op->perform())
+        {
+          descriptor_lock.unlock();
+          io_service_.post_immediate_completion(op);
+          return;
+        }
+      }
+    }
+  }
+
+  descriptor_data->op_queue_[op_type].push(op);
+  io_service_.work_started();
+
+  if (first)
+  {
+    struct kevent event;
+    switch (op_type)
+    {
+    case read_op:
+      BOOST_ASIO_KQUEUE_EV_SET(&event, descriptor, EVFILT_READ,
+          EV_ADD | EV_CLEAR, 0, 0, descriptor_data);
+      break;
+    case write_op:
+      BOOST_ASIO_KQUEUE_EV_SET(&event, descriptor, EVFILT_WRITE,
+          EV_ADD | EV_CLEAR, 0, 0, descriptor_data);
+      break;
+    case except_op:
+      if (!descriptor_data->op_queue_[read_op].empty())
+        return; // Already registered for read events.
+      BOOST_ASIO_KQUEUE_EV_SET(&event, descriptor, EVFILT_READ,
+          EV_ADD | EV_CLEAR, EV_OOBAND, 0, descriptor_data);
+      break;
+    }
+
+    if (::kevent(kqueue_fd_, &event, 1, 0, 0, 0) == -1)
+    {
+      op->ec_ = boost::system::error_code(errno,
+          boost::asio::error::get_system_category());
+      descriptor_data->op_queue_[op_type].pop();
+      io_service_.post_deferred_completion(op);
+    }
+  }
+}
+
+void kqueue_reactor::cancel_ops(socket_type,
+    kqueue_reactor::per_descriptor_data& descriptor_data)
+{
+  if (!descriptor_data)
+    return;
+
+  mutex::scoped_lock descriptor_lock(descriptor_data->mutex_);
+
+  op_queue<operation> ops;
+  for (int i = 0; i < max_ops; ++i)
+  {
+    while (reactor_op* op = descriptor_data->op_queue_[i].front())
+    {
+      op->ec_ = boost::asio::error::operation_aborted;
+      descriptor_data->op_queue_[i].pop();
+      ops.push(op);
+    }
+  }
+
+  descriptor_lock.unlock();
+
+  io_service_.post_deferred_completions(ops);
+}
+
+void kqueue_reactor::deregister_descriptor(socket_type descriptor,
+    kqueue_reactor::per_descriptor_data& descriptor_data, bool closing)
+{
+  if (!descriptor_data)
+    return;
+
+  mutex::scoped_lock descriptor_lock(descriptor_data->mutex_);
+
+  if (!descriptor_data->shutdown_)
+  {
+    if (closing)
+    {
+      // The descriptor will be automatically removed from the kqueue when it
+      // is closed.
+    }
+    else
+    {
+      struct kevent events[2];
+      BOOST_ASIO_KQUEUE_EV_SET(&events[0], descriptor,
+          EVFILT_READ, EV_DELETE, 0, 0, 0);
+      BOOST_ASIO_KQUEUE_EV_SET(&events[1], descriptor,
+          EVFILT_WRITE, EV_DELETE, 0, 0, 0);
+      ::kevent(kqueue_fd_, events, 2, 0, 0, 0);
+    }
+
+    op_queue<operation> ops;
+    for (int i = 0; i < max_ops; ++i)
+    {
+      while (reactor_op* op = descriptor_data->op_queue_[i].front())
+      {
+        op->ec_ = boost::asio::error::operation_aborted;
+        descriptor_data->op_queue_[i].pop();
+        ops.push(op);
+      }
+    }
+
+    descriptor_data->descriptor_ = -1;
+    descriptor_data->shutdown_ = true;
+
+    descriptor_lock.unlock();
+
+    free_descriptor_state(descriptor_data);
+    descriptor_data = 0;
+
+    io_service_.post_deferred_completions(ops);
+  }
+}
+
+void kqueue_reactor::deregister_internal_descriptor(socket_type descriptor,
+    kqueue_reactor::per_descriptor_data& descriptor_data)
+{
+  if (!descriptor_data)
+    return;
+
+  mutex::scoped_lock descriptor_lock(descriptor_data->mutex_);
+
+  if (!descriptor_data->shutdown_)
+  {
+    struct kevent events[2];
+    BOOST_ASIO_KQUEUE_EV_SET(&events[0], descriptor,
+        EVFILT_READ, EV_DELETE, 0, 0, 0);
+    BOOST_ASIO_KQUEUE_EV_SET(&events[1], descriptor,
+        EVFILT_WRITE, EV_DELETE, 0, 0, 0);
+    ::kevent(kqueue_fd_, events, 2, 0, 0, 0);
+
+    op_queue<operation> ops;
+    for (int i = 0; i < max_ops; ++i)
+      ops.push(descriptor_data->op_queue_[i]);
+
+    descriptor_data->descriptor_ = -1;
+    descriptor_data->shutdown_ = true;
+
+    descriptor_lock.unlock();
+
+    free_descriptor_state(descriptor_data);
+    descriptor_data = 0;
+  }
+}
+
+void kqueue_reactor::run(bool block, op_queue<operation>& ops)
+{
+  mutex::scoped_lock lock(mutex_);
+
+  // Determine how long to block while waiting for events.
+  timespec timeout_buf = { 0, 0 };
+  timespec* timeout = block ? get_timeout(timeout_buf) : &timeout_buf;
+
+  lock.unlock();
+
+  // Block on the kqueue descriptor.
+  struct kevent events[128];
+  int num_events = kevent(kqueue_fd_, 0, 0, events, 128, timeout);
+
+  // Dispatch the waiting events.
+  for (int i = 0; i < num_events; ++i)
+  {
+    int descriptor = events[i].ident;
+    void* ptr = reinterpret_cast<void*>(events[i].udata);
+    if (ptr == &interrupter_)
+    {
+      // No need to reset the interrupter since we're leaving the descriptor
+      // in a ready-to-read state and relying on edge-triggered notifications.
+    }
+    else
+    {
+      descriptor_state* descriptor_data = static_cast<descriptor_state*>(ptr);
+      mutex::scoped_lock descriptor_lock(descriptor_data->mutex_);
+
+      // Exception operations must be processed first to ensure that any
+      // out-of-band data is read before normal data.
+#if defined(__NetBSD__)
+      static const unsigned int filter[max_ops] =
+#else
+      static const int filter[max_ops] =
+#endif
+        { EVFILT_READ, EVFILT_WRITE, EVFILT_READ };
+      for (int j = max_ops - 1; j >= 0; --j)
+      {
+        if (events[i].filter == filter[j])
+        {
+          if (j != except_op || events[i].flags & EV_OOBAND)
+          {
+            while (reactor_op* op = descriptor_data->op_queue_[j].front())
+            {
+              if (events[i].flags & EV_ERROR)
+              {
+                op->ec_ = boost::system::error_code(events[i].data,
+                    boost::asio::error::get_system_category());
+                descriptor_data->op_queue_[j].pop();
+                ops.push(op);
+              }
+              if (op->perform())
+              {
+                descriptor_data->op_queue_[j].pop();
+                ops.push(op);
+              }
+              else
+                break;
+            }
+          }
+        }
+      }
+
+      // Renew registration for event notifications.
+      struct kevent event;
+      switch (events[i].filter)
+      {
+      case EVFILT_READ:
+        if (!descriptor_data->op_queue_[read_op].empty())
+          BOOST_ASIO_KQUEUE_EV_SET(&event, descriptor, EVFILT_READ,
+              EV_ADD | EV_CLEAR, 0, 0, descriptor_data);
+        else if (!descriptor_data->op_queue_[except_op].empty())
+          BOOST_ASIO_KQUEUE_EV_SET(&event, descriptor, EVFILT_READ,
+              EV_ADD | EV_CLEAR, EV_OOBAND, 0, descriptor_data);
+        else
+          continue;
+        break;
+      case EVFILT_WRITE:
+        if (!descriptor_data->op_queue_[write_op].empty())
+          BOOST_ASIO_KQUEUE_EV_SET(&event, descriptor, EVFILT_WRITE,
+              EV_ADD | EV_CLEAR, 0, 0, descriptor_data);
+        else
+          continue;
+        break;
+      default:
+        break;
+      }
+      if (::kevent(kqueue_fd_, &event, 1, 0, 0, 0) == -1)
+      {
+        boost::system::error_code error(errno,
+            boost::asio::error::get_system_category());
+        for (int j = 0; j < max_ops; ++j)
+        {
+          while (reactor_op* op = descriptor_data->op_queue_[j].front())
+          {
+            op->ec_ = error;
+            descriptor_data->op_queue_[j].pop();
+            ops.push(op);
+          }
+        }
+      }
+    }
+  }
+
+  lock.lock();
+  timer_queues_.get_ready_timers(ops);
+}
+
+void kqueue_reactor::interrupt()
+{
+  struct kevent event;
+  BOOST_ASIO_KQUEUE_EV_SET(&event, interrupter_.read_descriptor(),
+      EVFILT_READ, EV_ADD | EV_CLEAR, 0, 0, &interrupter_);
+  ::kevent(kqueue_fd_, &event, 1, 0, 0, 0);
+}
+
+int kqueue_reactor::do_kqueue_create()
+{
+  int fd = ::kqueue();
+  if (fd == -1)
+  {
+    boost::system::error_code ec(errno,
+        boost::asio::error::get_system_category());
+    boost::asio::detail::throw_error(ec, "kqueue");
+  }
+  return fd;
+}
+
+kqueue_reactor::descriptor_state* kqueue_reactor::allocate_descriptor_state()
+{
+  mutex::scoped_lock descriptors_lock(registered_descriptors_mutex_);
+  return registered_descriptors_.alloc();
+}
+
+void kqueue_reactor::free_descriptor_state(kqueue_reactor::descriptor_state* s)
+{
+  mutex::scoped_lock descriptors_lock(registered_descriptors_mutex_);
+  registered_descriptors_.free(s);
+}
+
+void kqueue_reactor::do_add_timer_queue(timer_queue_base& queue)
+{
+  mutex::scoped_lock lock(mutex_);
+  timer_queues_.insert(&queue);
+}
+
+void kqueue_reactor::do_remove_timer_queue(timer_queue_base& queue)
+{
+  mutex::scoped_lock lock(mutex_);
+  timer_queues_.erase(&queue);
+}
+
+timespec* kqueue_reactor::get_timeout(timespec& ts)
+{
+  // By default we will wait no longer than 5 minutes. This will ensure that
+  // any changes to the system clock are detected after no longer than this.
+  long usec = timer_queues_.wait_duration_usec(5 * 60 * 1000 * 1000);
+  ts.tv_sec = usec / 1000000;
+  ts.tv_nsec = (usec % 1000000) * 1000;
+  return &ts;
+}
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#undef BOOST_ASIO_KQUEUE_EV_SET
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // defined(BOOST_ASIO_HAS_KQUEUE)
+
+#endif // BOOST_ASIO_DETAIL_IMPL_KQUEUE_REACTOR_IPP