121 lines
2.9 KiB
C++
121 lines
2.9 KiB
C++
//
|
|
// detail/conditionally_enabled_event.hpp
|
|
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
//
|
|
// Copyright (c) 2003-2023 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 ASIO_DETAIL_CONDITIONALLY_ENABLED_EVENT_HPP
|
|
#define ASIO_DETAIL_CONDITIONALLY_ENABLED_EVENT_HPP
|
|
|
|
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
|
|
# pragma once
|
|
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
|
|
|
|
#include "asio/detail/config.hpp"
|
|
#include "asio/detail/conditionally_enabled_mutex.hpp"
|
|
#include "asio/detail/event.hpp"
|
|
#include "asio/detail/noncopyable.hpp"
|
|
#include "asio/detail/null_event.hpp"
|
|
#include "asio/detail/scoped_lock.hpp"
|
|
|
|
#include "asio/detail/push_options.hpp"
|
|
|
|
namespace asio {
|
|
namespace detail {
|
|
|
|
// Mutex adapter used to conditionally enable or disable locking.
|
|
class conditionally_enabled_event
|
|
: private noncopyable
|
|
{
|
|
public:
|
|
// Constructor.
|
|
conditionally_enabled_event()
|
|
{
|
|
}
|
|
|
|
// Destructor.
|
|
~conditionally_enabled_event()
|
|
{
|
|
}
|
|
|
|
// Signal the event. (Retained for backward compatibility.)
|
|
void signal(conditionally_enabled_mutex::scoped_lock& lock)
|
|
{
|
|
if (lock.mutex_.enabled_)
|
|
event_.signal(lock);
|
|
}
|
|
|
|
// Signal all waiters.
|
|
void signal_all(conditionally_enabled_mutex::scoped_lock& lock)
|
|
{
|
|
if (lock.mutex_.enabled_)
|
|
event_.signal_all(lock);
|
|
}
|
|
|
|
// Unlock the mutex and signal one waiter.
|
|
void unlock_and_signal_one(
|
|
conditionally_enabled_mutex::scoped_lock& lock)
|
|
{
|
|
if (lock.mutex_.enabled_)
|
|
event_.unlock_and_signal_one(lock);
|
|
}
|
|
|
|
// Unlock the mutex and signal one waiter who may destroy us.
|
|
void unlock_and_signal_one_for_destruction(
|
|
conditionally_enabled_mutex::scoped_lock& lock)
|
|
{
|
|
if (lock.mutex_.enabled_)
|
|
event_.unlock_and_signal_one(lock);
|
|
}
|
|
|
|
// If there's a waiter, unlock the mutex and signal it.
|
|
bool maybe_unlock_and_signal_one(
|
|
conditionally_enabled_mutex::scoped_lock& lock)
|
|
{
|
|
if (lock.mutex_.enabled_)
|
|
return event_.maybe_unlock_and_signal_one(lock);
|
|
else
|
|
return false;
|
|
}
|
|
|
|
// Reset the event.
|
|
void clear(conditionally_enabled_mutex::scoped_lock& lock)
|
|
{
|
|
if (lock.mutex_.enabled_)
|
|
event_.clear(lock);
|
|
}
|
|
|
|
// Wait for the event to become signalled.
|
|
void wait(conditionally_enabled_mutex::scoped_lock& lock)
|
|
{
|
|
if (lock.mutex_.enabled_)
|
|
event_.wait(lock);
|
|
else
|
|
null_event().wait(lock);
|
|
}
|
|
|
|
// Timed wait for the event to become signalled.
|
|
bool wait_for_usec(
|
|
conditionally_enabled_mutex::scoped_lock& lock, long usec)
|
|
{
|
|
if (lock.mutex_.enabled_)
|
|
return event_.wait_for_usec(lock, usec);
|
|
else
|
|
return null_event().wait_for_usec(lock, usec);
|
|
}
|
|
|
|
private:
|
|
asio::detail::event event_;
|
|
};
|
|
|
|
} // namespace detail
|
|
} // namespace asio
|
|
|
|
#include "asio/detail/pop_options.hpp"
|
|
|
|
#endif // ASIO_DETAIL_CONDITIONALLY_ENABLED_EVENT_HPP
|