129 lines
2.9 KiB
C++
129 lines
2.9 KiB
C++
|
//
|
||
|
|
// detail/posix_event.hpp
|
||
|
|
// ~~~~~~~~~~~~~~~~~~~~~~
|
||
|
|
//
|
||
|
|
// Copyright (c) 2003-2016 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/config.hpp>
|
||
|
|
|
||
|
|
#if defined(BOOST_ASIO_HAS_PTHREADS)
|
||
|
|
|
||
|
|
#include <pthread.h>
|
||
|
|
#include <boost/asio/detail/assert.hpp>
|
||
|
|
#include <boost/asio/detail/noncopyable.hpp>
|
||
|
|
|
||
|
|
#include <boost/asio/detail/push_options.hpp>
|
||
|
|
|
||
|
|
namespace boost {
|
||
|
|
namespace asio {
|
||
|
|
namespace detail {
|
||
|
|
|
||
|
|
class posix_event
|
||
|
|
: private noncopyable
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
// Constructor.
|
||
|
|
BOOST_ASIO_DECL posix_event();
|
||
|
|
|
||
|
|
// Destructor.
|
||
|
|
~posix_event()
|
||
|
|
{
|
||
|
|
::pthread_cond_destroy(&cond_);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Signal the event. (Retained for backward compatibility.)
|
||
|
|
template <typename Lock>
|
||
|
|
void signal(Lock& lock)
|
||
|
|
{
|
||
|
|
this->signal_all(lock);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Signal all waiters.
|
||
|
|
template <typename Lock>
|
||
|
|
void signal_all(Lock& lock)
|
||
|
|
{
|
||
|
|
BOOST_ASIO_ASSERT(lock.locked());
|
||
|
|
(void)lock;
|
||
|
|
state_ |= 1;
|
||
|
|
::pthread_cond_broadcast(&cond_); // Ignore EINVAL.
|
||
|
|
}
|
||
|
|
|
||
|
|
// Unlock the mutex and signal one waiter.
|
||
|
|
template <typename Lock>
|
||
|
|
void unlock_and_signal_one(Lock& lock)
|
||
|
|
{
|
||
|
|
BOOST_ASIO_ASSERT(lock.locked());
|
||
|
|
state_ |= 1;
|
||
|
|
bool have_waiters = (state_ > 1);
|
||
|
|
lock.unlock();
|
||
|
|
if (have_waiters)
|
||
|
|
::pthread_cond_signal(&cond_); // Ignore EINVAL.
|
||
|
|
}
|
||
|
|
|
||
|
|
// If there's a waiter, unlock the mutex and signal it.
|
||
|
|
template <typename Lock>
|
||
|
|
bool maybe_unlock_and_signal_one(Lock& lock)
|
||
|
|
{
|
||
|
|
BOOST_ASIO_ASSERT(lock.locked());
|
||
|
|
state_ |= 1;
|
||
|
|
if (state_ > 1)
|
||
|
|
{
|
||
|
|
lock.unlock();
|
||
|
|
::pthread_cond_signal(&cond_); // Ignore EINVAL.
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Reset the event.
|
||
|
|
template <typename Lock>
|
||
|
|
void clear(Lock& lock)
|
||
|
|
{
|
||
|
|
BOOST_ASIO_ASSERT(lock.locked());
|
||
|
|
(void)lock;
|
||
|
|
state_ &= ~std::size_t(1);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Wait for the event to become signalled.
|
||
|
|
template <typename Lock>
|
||
|
|
void wait(Lock& lock)
|
||
|
|
{
|
||
|
|
BOOST_ASIO_ASSERT(lock.locked());
|
||
|
|
while ((state_ & 1) == 0)
|
||
|
|
{
|
||
|
|
state_ += 2;
|
||
|
|
::pthread_cond_wait(&cond_, &lock.mutex().mutex_); // Ignore EINVAL.
|
||
|
|
state_ -= 2;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
::pthread_cond_t cond_;
|
||
|
|
std::size_t state_;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace detail
|
||
|
|
} // namespace asio
|
||
|
|
} // namespace boost
|
||
|
|
|
||
|
|
#include <boost/asio/detail/pop_options.hpp>
|
||
|
|
|
||
|
|
#if defined(BOOST_ASIO_HEADER_ONLY)
|
||
|
|
# include <boost/asio/detail/impl/posix_event.ipp>
|
||
|
|
#endif // defined(BOOST_ASIO_HEADER_ONLY)
|
||
|
|
|
||
|
|
#endif // defined(BOOST_ASIO_HAS_PTHREADS)
|
||
|
|
|
||
|
|
#endif // BOOST_ASIO_DETAIL_POSIX_EVENT_HPP
|