| // |
| // posix_event.hpp |
| // ~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2008 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_POSIX_EVENT_HPP |
| #define BOOST_ASIO_DETAIL_POSIX_EVENT_HPP |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1200) |
| # pragma once |
| #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) |
| |
| #include <boost/asio/detail/push_options.hpp> |
| |
| #include <boost/asio/detail/push_options.hpp> |
| #include <boost/config.hpp> |
| #include <boost/system/system_error.hpp> |
| #include <boost/asio/detail/pop_options.hpp> |
| |
| #if defined(BOOST_HAS_PTHREADS) |
| |
| #include <boost/asio/detail/push_options.hpp> |
| #include <boost/assert.hpp> |
| #include <boost/throw_exception.hpp> |
| #include <pthread.h> |
| #include <boost/asio/detail/pop_options.hpp> |
| |
| #include <boost/asio/error.hpp> |
| #include <boost/asio/detail/noncopyable.hpp> |
| |
| namespace boost { |
| namespace asio { |
| namespace detail { |
| |
| class posix_event |
| : private noncopyable |
| { |
| public: |
| // Constructor. |
| posix_event() |
| : signalled_(false) |
| { |
| int error = ::pthread_cond_init(&cond_, 0); |
| if (error != 0) |
| { |
| boost::system::system_error e( |
| boost::system::error_code(error, |
| boost::asio::error::get_system_category()), |
| "event"); |
| boost::throw_exception(e); |
| } |
| } |
| |
| // Destructor. |
| ~posix_event() |
| { |
| ::pthread_cond_destroy(&cond_); |
| } |
| |
| // Signal the event. |
| template <typename Lock> |
| void signal(Lock& lock) |
| { |
| BOOST_ASSERT(lock.locked()); |
| (void)lock; |
| signalled_ = true; |
| ::pthread_cond_signal(&cond_); // Ignore EINVAL. |
| } |
| |
| // Reset the event. |
| template <typename Lock> |
| void clear(Lock& lock) |
| { |
| BOOST_ASSERT(lock.locked()); |
| (void)lock; |
| signalled_ = false; |
| } |
| |
| // Wait for the event to become signalled. |
| template <typename Lock> |
| void wait(Lock& lock) |
| { |
| BOOST_ASSERT(lock.locked()); |
| while (!signalled_) |
| ::pthread_cond_wait(&cond_, &lock.mutex().mutex_); // Ignore EINVAL. |
| } |
| |
| private: |
| ::pthread_cond_t cond_; |
| bool signalled_; |
| }; |
| |
| } // namespace detail |
| } // namespace asio |
| } // namespace boost |
| |
| #endif // defined(BOOST_HAS_PTHREADS) |
| |
| #include <boost/asio/detail/pop_options.hpp> |
| |
| #endif // BOOST_ASIO_DETAIL_POSIX_EVENT_HPP |