CWE-ou-minkata/Sources/Plasma/CoreLib/hsThread_Mac.cpp

/*==LICENSE==*

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*==LICENSE==*/
#include "hsThread.h"
#include "hsExceptions.h"

extern "C" {
    static OSStatus gEntryPoint(void* param)
    {
        return ((hsThread*)param)->Run();
    }
}

hsThread::hsThread(uint32_t stackSize) : fTaskId(0), fStackSize(stackSize), fQuit(false)
{
    if (MPLibraryIsLoaded() == false)
        throw "MPLibraryIsLoaded() returned false";
}

hsThread::~hsThread()
{
    this->Stop();
}

void hsThread::Start()
{
    if (fTaskId == 0)
    {   OSStatus    status = ::MPCreateQueue(&fNotifyQ);
        hsThrowIfOSErr(status);

        status = ::MPCreateTask(gEntryPoint, this, fStackSize, fNotifyQ, nil, nil, 0, &fTaskId);
        if (status)
        {   ::MPDeleteQueue(fNotifyQ);
            throw hsOSException(status);
        }
    }
    else
        hsDebugMessage("Calling hsThread::Start() more than once", 0);
}

void hsThread::Stop()
{
    if (fTaskId)
    {   this->fQuit = true;

        OSStatus    status = ::MPTerminateTask(fTaskId, 0);
        hsThrowIfOSErr(status);
        
        //  Wait for the task to tell us that its actually quit
        status = ::MPWaitOnQueue(fNotifyQ, nil, nil, nil, kDurationForever);
        hsThrowIfOSErr(status);

        status = ::MPDeleteQueue(fNotifyQ);
        hsThrowIfOSErr(status);
        
        fTaskId = 0;
    }
}

//////////////////////////////////////////////////////////////////////////////

void* hsThread::Alloc(size_t size)
{
    return ::MPAllocate(size);
}

void hsThread::Free(void* p)
{
    if (p)
        ::MPFree(p);
}

void hsThread::ThreadYield()
{
    ::MPYield();
}

//////////////////////////////////////////////////////////////////////////////

hsMutex::hsMutex()
{
    OSStatus status = ::MPCreateCriticalRegion(&fCriticalRegion);
    hsThrowIfOSErr(status);
}

hsMutex::~hsMutex()
{
    OSStatus    status = ::MPDeleteCriticalRegion(fCriticalRegion);
    hsThrowIfOSErr(status);
}

void hsMutex::Lock()
{
    OSStatus    status = ::MPEnterCriticalRegion(fCriticalRegion, kDurationForever);
    hsThrowIfOSErr(status);
}

void hsMutex::Unlock()
{
    OSStatus    status = ::MPExitCriticalRegion(fCriticalRegion);
    hsThrowIfOSErr(status);
}

//////////////////////////////////////////////////////////////////////////////

hsSemaphore::hsSemaphore(int initialValue)
{
    OSStatus    status = MPCreateSemaphore(kPosInfinity32, initialValue, &fSemaId);
    hsThrowIfOSErr(status);
}

hsSemaphore::~hsSemaphore()
{
    OSStatus    status = MPDeleteSemaphore(fSemaId);
    hsThrowIfOSErr(status);
}

bool hsSemaphore::Wait(hsMilliseconds timeToWait)
{
    Duration    duration;

    if (timeToWait == kPosInfinity32)
        duration = kDurationForever;
    else
        duration = 0;   // THEY DON'T IMPLEMENT delay times yet !!!

    OSStatus    status = MPWaitOnSemaphore(fSemaId, duration);
/*
    if (status == kMPTimeoutErr)
        return false;
*/
    hsThrowIfOSErr(status);
    return true;
}

void hsSemaphore::Signal()
{
    OSStatus    status = MPSignalSemaphore(fSemaId);
    hsThrowIfOSErr(status);
}