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** Copyright (C) 2008-2012 NVIDIA Corporation.
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
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** This file is part of Qt 3D Studio.
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#include "foundation/windows/Qt3DSWindowsInclude.h"
#include "foundation/Qt3DSSemaphore.h"
#include "foundation/Qt3DSAllocator.h"

namespace qt3ds {
namespace foundation {

    class SemaphoreImpl
    {
    public:
        SemaphoreImpl(NVAllocatorCallback &alloc)
            : mAllocator(alloc)
        {
        }
        NVAllocatorCallback &mAllocator;
        HANDLE handle;
    };

    Semaphore::Semaphore(NVAllocatorCallback &alloc, QT3DSU32 initialCount, QT3DSU32 maxCount)
    {
        mImpl = QT3DS_NEW(alloc, SemaphoreImpl)(alloc);
        mImpl->handle = CreateSemaphore(0, initialCount, maxCount, (LPCTSTR)NULL);
    }

    Semaphore::~Semaphore()
    {
        CloseHandle(mImpl->handle);
        QT3DS_FREE(mImpl->mAllocator, mImpl);
    }

    bool Semaphore::wait(QT3DSU32 milliseconds)
    {
        if (milliseconds == -1)
            milliseconds = INFINITE;

        return WaitForSingleObject(mImpl->handle, milliseconds) == WAIT_OBJECT_0 ? true : false;
    }

    void Semaphore::post() { ReleaseSemaphore(mImpl->handle, 1, (LPLONG)NULL); }

} // namespace foundation
} // namespace qt3ds