60 lines
1.2 KiB
C++
60 lines
1.2 KiB
C++
#pragma once
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#if (IL2CPP_THREADS_PTHREAD || IL2CPP_THREADS_WIN32) && !RUNTIME_TINY
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#include "os/Generic/WaitObject.h"
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#include "os/ErrorCodes.h"
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#include "os/WaitStatus.h"
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#include <stdint.h>
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namespace il2cpp
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{
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namespace os
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{
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class SemaphoreImpl : public WaitObject
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{
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public:
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SemaphoreImpl(int32_t initialValue, int32_t maximumValue)
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: WaitObject(kSemaphore)
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, m_MaximumValue(maximumValue)
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{
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m_Count = initialValue;
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}
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~SemaphoreImpl()
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{
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}
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bool Post(int32_t releaseCount, int32_t* previousCount)
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{
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uint32_t oldCount;
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{
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WaitObject::ReleaseOnDestroy lock(m_Mutex);
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oldCount = m_Count;
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// Make sure we stay within range. Account for 32bit overflow.
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if (static_cast<uint64_t>(oldCount) + releaseCount > m_MaximumValue)
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return false;
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m_Count += releaseCount;
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WakeupOneThread();
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}
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if (previousCount)
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*previousCount = oldCount;
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return true;
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}
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protected:
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uint32_t m_MaximumValue;
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};
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}
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}
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#endif
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