73 lines
1.7 KiB
C++
73 lines
1.7 KiB
C++
// SPDX-License-Identifier: BSD-2-Clause
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// author: Max Kellermann <max.kellermann@gmail.com>
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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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static_cast<DWORD>(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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