// // 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