c61b4598e8
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85 lines
2.2 KiB
C++
85 lines
2.2 KiB
C++
// Copyright (C) 2015 Jérôme Leclercq
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// This file is part of the "Nazara Engine - Core module"
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// For conditions of distribution and use, see copyright notice in Config.hpp
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// Source: http://www.cs.wustl.edu/~schmidt/win32-cv-1.html
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#include <Nazara/Core/Win32/ConditionVariableImpl.hpp>
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#include <Nazara/Core/Win32/MutexImpl.hpp>
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#include <Nazara/Core/Debug.hpp>
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namespace Nz
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{
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ConditionVariableImpl::ConditionVariableImpl()
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{
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#if NAZARA_CORE_WINDOWS_NT6
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InitializeConditionVariable(&m_cv);
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#else
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m_count = 0;
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m_events[BROADCAST] = CreateEvent(nullptr, true, false, nullptr); // manual-reset event
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m_events[SIGNAL] = CreateEvent(nullptr, false, false, nullptr); // auto-reset event
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#endif
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}
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#if !NAZARA_CORE_WINDOWS_NT6
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ConditionVariableImpl::~ConditionVariableImpl()
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{
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CloseHandle(m_events[BROADCAST]);
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CloseHandle(m_events[SIGNAL]);
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}
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#endif
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void ConditionVariableImpl::Signal()
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{
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#if NAZARA_CORE_WINDOWS_NT6
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WakeConditionVariable(&m_cv);
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#else
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if (m_count > 0)
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SetEvent(m_events[SIGNAL]);
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#endif
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}
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void ConditionVariableImpl::SignalAll()
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{
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#if NAZARA_CORE_WINDOWS_NT6
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WakeAllConditionVariable(&m_cv);
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#else
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if (m_count > 0)
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SetEvent(m_events[BROADCAST]);
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#endif
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}
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void ConditionVariableImpl::Wait(MutexImpl* mutex)
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{
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Wait(mutex, INFINITE);
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}
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bool ConditionVariableImpl::Wait(MutexImpl* mutex, UInt32 timeout)
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{
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#if NAZARA_CORE_WINDOWS_NT6
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return SleepConditionVariableCS(&m_cv, &mutex->m_criticalSection, timeout) == TRUE;
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#else
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m_count++;
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// It's ok to release the mutex here since Win32
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// manual-reset events maintain state when used with SetEvent.
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// This avoids the "lost wakeup" bug...
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LeaveCriticalSection(&mutex->m_criticalSection);
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// Wait for either event to become signaled due to Signal being called or SignalAll being called.
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int result = WaitForMultipleObjects(2, m_events, false, timeout);
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// Some thread called SignalAll
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if (--m_count == 0 && result == WAIT_OBJECT_0 + BROADCAST)
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// We're the last waiter to be notified or to stop waiting, so reset the manual event.
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ResetEvent(m_events[BROADCAST]);
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// Reacquire the mutex.
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EnterCriticalSection(&mutex->m_criticalSection);
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return result != WAIT_TIMEOUT;
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#endif
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}
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}
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