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/*
* Copyright 2009-2019 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THREAD_WINDOWS_COND_HXX
#define THREAD_WINDOWS_COND_HXX
#include "CriticalSection.hxx"
#include <windef.h> // for HWND (needed by winbase.h)
#include <winbase.h> // for INFINITE
#include <chrono>
#include <mutex>
/**
* Wrapper for a CONDITION_VARIABLE, backend for the Cond class.
*/
class WindowsCond {
CONDITION_VARIABLE cond;
public:
WindowsCond() noexcept {
InitializeConditionVariable(&cond);
}
WindowsCond(const WindowsCond &other) = delete;
WindowsCond &operator=(const WindowsCond &other) = delete;
void notify_one() noexcept {
WakeConditionVariable(&cond);
}
void notify_all() noexcept {
WakeAllConditionVariable(&cond);
}
void wait(std::unique_lock<CriticalSection> &lock) noexcept {
SleepConditionVariableCS(&cond,
&lock.mutex()->critical_section,
INFINITE);
}
template<typename M, typename P>
void wait(std::unique_lock<M> &lock,
P &&predicate) noexcept {
while (!predicate())
wait(lock);
}
bool wait_for(std::unique_lock<CriticalSection> &lock,
std::chrono::steady_clock::duration timeout) noexcept {
auto timeout_ms = std::chrono::duration_cast<std::chrono::milliseconds>(timeout).count();
return SleepConditionVariableCS(&cond,
&lock.mutex()->critical_section,
timeout_ms);
}
template<typename M, typename P>
bool wait_for(std::unique_lock<M> &lock,
std::chrono::steady_clock::duration timeout,
P &&predicate) noexcept {
while (!predicate()) {
// TODO: without wait_until(), this multiplies the timeout
if (!wait_for(lock, timeout))
return predicate();
}
return true;
}
};
#endif
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