/*---------------------------------------------------------------------------*
  Project:  Horizon
  File:     os_InterCoreLightSemaphore.cpp

  Copyright (C)2009 Nintendo Co., Ltd.  All rights reserved.

  These coded instructions, statements, and computer programs contain
  proprietary information of Nintendo of America Inc. and/or Nintendo
  Company Ltd., and are protected by Federal copyright law. They may
  not be disclosed to third parties or copied or duplicated in any form,
  in whole or in part, without the prior written consent of Nintendo.

  $Rev: 33107 $
 *---------------------------------------------------------------------------*/

#include <nn/os/os_InterCoreLightSemaphore.h>

//---------------------------------------------------------------------------

namespace nn {
namespace os {

    s32 InterCoreLightSemaphore::Release(s32 releaseCount /*= 1*/)
    {
        NN_MIN_TASSERT_( releaseCount, 1 );

#if NN_PLATFORM_HAS_16BIT_LL_SC
        LimitedAdd updater;
        updater.max   = m_Max;
        updater.value = releaseCount;

        m_Counter->AtomicUpdateConditional(updater);
        const s32 beforeUpdate = updater.beforeUpdate;
#else
        const s32 beforeUpdate = m_Counter->operator++(0);
#endif
        DataSynchronizationBarrier();

        // If the counter before addition is zero, the thread for the value to be added is woken up.
        if( (beforeUpdate <= 0) || (m_NumWaiting > 0) )
        {
            m_Counter.Signal(releaseCount);
        }

        return beforeUpdate;
    }

}
}

using namespace nn;


// C Function Definitions

#include <new>

using namespace nn::os;

extern "C" {

void nnosInterCoreLightSemaphoreInitialize(nnosInterCoreLightSemaphore* p, s32 initialCount, s32 maxCount)
{
    new (p) InterCoreLightSemaphore();
    InterCoreLightSemaphore* pInterCoreLightSemaphore = reinterpret_cast<InterCoreLightSemaphore*>(p);
    pInterCoreLightSemaphore->Initialize(initialCount, maxCount);
}

#if NN_PLATFORM_HAS_16BIT_LL_SC
s32 nnosInterCoreLightSemaphoreGetMax(nnosInterCoreLightSemaphore* p)
{
    InterCoreLightSemaphore* pInterCoreLightSemaphore = reinterpret_cast<InterCoreLightSemaphore*>(p);
    return pInterCoreLightSemaphore->GetMax();
}
#endif

s32 nnosInterCoreLightSemaphoreGetCount(nnosInterCoreLightSemaphore* p)
{
    InterCoreLightSemaphore* pInterCoreLightSemaphore = reinterpret_cast<InterCoreLightSemaphore*>(p);
    return pInterCoreLightSemaphore->GetCount();
}

s32 nnosInterCoreLightSemaphoreRelease(nnosInterCoreLightSemaphore* p, s32 releaseCount)
{
    InterCoreLightSemaphore* pInterCoreLightSemaphore = reinterpret_cast<InterCoreLightSemaphore*>(p);
    return pInterCoreLightSemaphore->Release(releaseCount);
}

void nnosInterCoreLightSemaphoreAcquire(nnosInterCoreLightSemaphore* p)
{
    InterCoreLightSemaphore* pInterCoreLightSemaphore = reinterpret_cast<InterCoreLightSemaphore*>(p);
    pInterCoreLightSemaphore->Acquire();
}

bool nnosInterCoreLightSemaphoreTryAcquire(nnosInterCoreLightSemaphore* p)
{
    InterCoreLightSemaphore* pInterCoreLightSemaphore = reinterpret_cast<InterCoreLightSemaphore*>(p);
    return pInterCoreLightSemaphore->TryAcquire();
}

void nnosInterCoreLightSemaphoreFinalize(nnosInterCoreLightSemaphore* p)
{
    InterCoreLightSemaphore* pInterCoreLightSemaphore = reinterpret_cast<InterCoreLightSemaphore*>(p);
    pInterCoreLightSemaphore->~InterCoreLightSemaphore();
}

} // extern "C"