/*---------------------------------------------------------------------------*
  Project:  Horizon
  File:     os_CriticalSection.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: 16750 $
 *---------------------------------------------------------------------------*/

#include <nn/assert.h>
#include <nn/config.h>
#include <nn/os/os_CriticalSection.h>
#include <nn/fnd/fnd_Interlocked.h>
#include <nn/os/os_Timer.h>

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

using namespace nn;
using namespace nn::fnd;
using namespace nn::svc;
using namespace nn::os;
using namespace nn::util;

namespace nn{ namespace os{

void CriticalSection::EnterImpl()
{
    for(;;)
    {
        // At this time,rather than calling TryEnterImpl with a check of the counter
        // Determines whether another thread is entering a critical section quickly.
        if( *m_Counter > 0 )
        {
            if( TryEnterImpl() )
            {
                break;
            }
        }

        // If another thread is invading a critical section
        // Decrement counter and wait.
        m_Counter.DecrementAndWaitIfLessThan(0);
    }
}

}} // namespace nn::os

#include <new>

using namespace nn::os;

extern "C" {

void nnosCriticalSectionInitialize(nnosCriticalSection* p)
{
    new (p) CriticalSection(nn::WithInitialize());
}

bool nnosCriticalSectionTryInitialize(nnosCriticalSection* p)
{
    new (p) CriticalSection(nn::WithInitialize());
    CriticalSection* pCriticalSection = reinterpret_cast<CriticalSection*>(p);
    Result result = pCriticalSection->TryInitialize();
    return result.IsSuccess();
}

void nnosCriticalSectionEnter(nnosCriticalSection* p)
{
    CriticalSection* pCriticalSection = reinterpret_cast<CriticalSection*>(p);
    pCriticalSection->Enter();
}

bool nnosCriticalSectionTryEnter(nnosCriticalSection* p)
{
    CriticalSection* pCriticalSection = reinterpret_cast<CriticalSection*>(p);
    return pCriticalSection->TryEnter();
}

void nnosCriticalSectionLeave(nnosCriticalSection* p)
{
    CriticalSection* pCriticalSection = reinterpret_cast<CriticalSection*>(p);
    pCriticalSection->Leave();
}

void nnosCriticalSectionFinalize(nnosCriticalSection* p)
{
    CriticalSection* pCriticalSection = reinterpret_cast<CriticalSection*>(p);
    pCriticalSection->~CriticalSection();
}

}