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157 lines
3.6 KiB
157 lines
3.6 KiB
//
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// detail/posix_event.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_DETAIL_POSIX_EVENT_HPP
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#define ASIO_DETAIL_POSIX_EVENT_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#if defined(ASIO_HAS_PTHREADS)
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#include <pthread.h>
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#include "asio/detail/assert.hpp"
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#include "asio/detail/noncopyable.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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class posix_event
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: private noncopyable
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{
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public:
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// Constructor.
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ASIO_DECL posix_event();
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// Destructor.
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~posix_event()
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{
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::pthread_cond_destroy(&cond_);
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}
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// Signal the event. (Retained for backward compatibility.)
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template <typename Lock>
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void signal(Lock& lock)
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{
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this->signal_all(lock);
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}
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// Signal all waiters.
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template <typename Lock>
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void signal_all(Lock& lock)
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{
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ASIO_ASSERT(lock.locked());
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(void)lock;
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state_ |= 1;
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::pthread_cond_broadcast(&cond_); // Ignore EINVAL.
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}
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// Unlock the mutex and signal one waiter.
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template <typename Lock>
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void unlock_and_signal_one(Lock& lock)
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{
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ASIO_ASSERT(lock.locked());
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state_ |= 1;
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bool have_waiters = (state_ > 1);
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lock.unlock();
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if (have_waiters)
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::pthread_cond_signal(&cond_); // Ignore EINVAL.
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}
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// If there's a waiter, unlock the mutex and signal it.
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template <typename Lock>
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bool maybe_unlock_and_signal_one(Lock& lock)
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{
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ASIO_ASSERT(lock.locked());
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state_ |= 1;
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if (state_ > 1)
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{
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lock.unlock();
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::pthread_cond_signal(&cond_); // Ignore EINVAL.
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return true;
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}
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return false;
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}
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// Reset the event.
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template <typename Lock>
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void clear(Lock& lock)
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{
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ASIO_ASSERT(lock.locked());
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(void)lock;
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state_ &= ~std::size_t(1);
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}
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// Wait for the event to become signalled.
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template <typename Lock>
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void wait(Lock& lock)
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{
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ASIO_ASSERT(lock.locked());
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while ((state_ & 1) == 0)
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{
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state_ += 2;
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::pthread_cond_wait(&cond_, &lock.mutex().mutex_); // Ignore EINVAL.
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state_ -= 2;
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}
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}
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// Timed wait for the event to become signalled.
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template <typename Lock>
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bool wait_for_usec(Lock& lock, long usec)
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{
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ASIO_ASSERT(lock.locked());
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if ((state_ & 1) == 0)
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{
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state_ += 2;
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timespec ts;
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#if (defined(__MACH__) && defined(__APPLE__))
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ts.tv_sec = usec / 1000000;
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ts.tv_nsec = (usec % 1000000) * 1000;
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::pthread_cond_timedwait_relative_np(
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&cond_, &lock.mutex().mutex_, &ts); // Ignore EINVAL.
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#else // (defined(__MACH__) && defined(__APPLE__))
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if (::clock_gettime(CLOCK_MONOTONIC, &ts) == 0)
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{
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ts.tv_sec += usec / 1000000;
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ts.tv_nsec = (usec % 1000000) * 1000;
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ts.tv_sec += ts.tv_nsec / 1000000000;
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ts.tv_nsec = ts.tv_nsec % 1000000000;
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::pthread_cond_timedwait(&cond_,
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&lock.mutex().mutex_, &ts); // Ignore EINVAL.
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}
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#endif // (defined(__MACH__) && defined(__APPLE__))
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state_ -= 2;
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}
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return (state_ & 1) != 0;
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}
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private:
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::pthread_cond_t cond_;
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std::size_t state_;
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};
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#if defined(ASIO_HEADER_ONLY)
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# include "asio/detail/impl/posix_event.ipp"
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#endif // defined(ASIO_HEADER_ONLY)
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#endif // defined(ASIO_HAS_PTHREADS)
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#endif // ASIO_DETAIL_POSIX_EVENT_HPP
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