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