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Diffstat (limited to 'boost/asio/detail/thread_info_base.hpp')
-rw-r--r-- | boost/asio/detail/thread_info_base.hpp | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/boost/asio/detail/thread_info_base.hpp b/boost/asio/detail/thread_info_base.hpp new file mode 100644 index 0000000000..9a12e254b3 --- /dev/null +++ b/boost/asio/detail/thread_info_base.hpp @@ -0,0 +1,93 @@ +// +// detail/thread_info_base.hpp +// ~~~~~~~~~~~~~~~~~~~~~~~~~~~ +// +// Copyright (c) 2003-2014 Christopher M. Kohlhoff (chris at kohlhoff 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_THREAD_INFO_BASE_HPP +#define BOOST_ASIO_DETAIL_THREAD_INFO_BASE_HPP + +#if defined(_MSC_VER) && (_MSC_VER >= 1200) +# pragma once +#endif // defined(_MSC_VER) && (_MSC_VER >= 1200) + +#include <climits> +#include <cstddef> +#include <boost/asio/detail/noncopyable.hpp> + +#include <boost/asio/detail/push_options.hpp> + +namespace boost { +namespace asio { +namespace detail { + +class thread_info_base + : private noncopyable +{ +public: + thread_info_base() + : reusable_memory_(0) + { + } + + ~thread_info_base() + { + if (reusable_memory_) + ::operator delete(reusable_memory_); + } + + static void* allocate(thread_info_base* this_thread, std::size_t size) + { + if (this_thread && this_thread->reusable_memory_) + { + void* const pointer = this_thread->reusable_memory_; + this_thread->reusable_memory_ = 0; + + unsigned char* const mem = static_cast<unsigned char*>(pointer); + if (static_cast<std::size_t>(mem[0]) >= size) + { + mem[size] = mem[0]; + return pointer; + } + + ::operator delete(pointer); + } + + void* const pointer = ::operator new(size + 1); + unsigned char* const mem = static_cast<unsigned char*>(pointer); + mem[size] = (size <= UCHAR_MAX) ? static_cast<unsigned char>(size) : 0; + return pointer; + } + + static void deallocate(thread_info_base* this_thread, + void* pointer, std::size_t size) + { + if (size <= UCHAR_MAX) + { + if (this_thread && this_thread->reusable_memory_ == 0) + { + unsigned char* const mem = static_cast<unsigned char*>(pointer); + mem[0] = mem[size]; + this_thread->reusable_memory_ = pointer; + return; + } + } + + ::operator delete(pointer); + } + +private: + void* reusable_memory_; +}; + +} // namespace detail +} // namespace asio +} // namespace boost + +#include <boost/asio/detail/pop_options.hpp> + +#endif // BOOST_ASIO_DETAIL_THREAD_INFO_BASE_HPP |