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

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*==LICENSE==*/

#include "hsWindows.h"
#include <process.h>
#pragma hdrstop

#include "hsThread.h"
#include "hsExceptions.h"
#include "hsMemory.h"

struct WinThreadParam
{
    hsThread* fThread;
    HANDLE    fQuitSemaH; // private member of hsThread

    WinThreadParam(hsThread* t, HANDLE quit)
        : fThread(t), fQuitSemaH(quit)
    { }
};

static unsigned int __stdcall gEntryPointBT(void* param)
{
#ifdef USE_VLD
    // Needs to be enabled for each thread except the WinMain
    VLDEnable();
#endif

    WinThreadParam* wtp = (WinThreadParam*)param;
    unsigned int result = wtp->fThread->Run();
    ::ReleaseSemaphore(wtp->fQuitSemaH, 1, nil); // signal that we've quit
    wtp->fThread->OnQuit();
    delete wtp;
    return result;
}

hsThread::hsThread(uint32_t stackSize) : fStackSize(stackSize), fQuit(false), fThreadH(nil), fQuitSemaH(nil)
{
}

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

hsThread::ThreadId hsThread::GetMyThreadId()
{
    return GetCurrentThreadId();
}

void hsThread::Start()
{
    if (fThreadH == nil)
    {
        fQuitSemaH = ::CreateSemaphore(nil, 0, kPosInfinity32, nil);
        if (fQuitSemaH == nil)
            throw hsOSException(-1);
        WinThreadParam* wtp = new WinThreadParam(this, fQuitSemaH);
        fThreadH = (HANDLE)_beginthreadex(nil, fStackSize, gEntryPointBT, wtp, 0, (unsigned int*)&fThreadId);
        if (fThreadH == nil)
            throw hsOSException(-1);
    }
}

void hsThread::Stop()
{
    if (fThreadH != nil)
    {   this->fQuit = true;

        if (fQuitSemaH != nil)
            ::WaitForSingleObject(fQuitSemaH, INFINITE);    // wait for the thread to quit

        ::CloseHandle(fThreadH);
        fThreadH = nil;
        ::CloseHandle(fQuitSemaH);
        fQuitSemaH = nil;
    }
}

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

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

void hsThread::Free(void* p)
{
    HSMemory::Delete(p);
}

void hsThread::ThreadYield()
{
    //  Don't know how to explicitly yield on WIN32
}

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

hsGlobalSemaphore::hsGlobalSemaphore(int initialValue, const char *name)
{
    fSemaH = ::CreateSemaphore(nil, initialValue, kPosInfinity32, name);
    if (fSemaH == nil)
        throw hsOSException(-1);
}

hsGlobalSemaphore::~hsGlobalSemaphore()
{
    ::CloseHandle(fSemaH);
}

bool hsGlobalSemaphore::Wait(hsMilliseconds timeToWait)
{
    if (timeToWait == kPosInfinity32)
        timeToWait = INFINITE;
    
    DWORD result =::WaitForSingleObject(fSemaH, timeToWait);

    if (result == WAIT_OBJECT_0)
        return true;
    else
    {   hsThrowIfFalse(result == WAIT_TIMEOUT);
        return false;
    }
}

void hsGlobalSemaphore::Signal()
{
    ::ReleaseSemaphore(fSemaH, 1, nil);
}

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

void hsSleep::Sleep(uint32_t millis)
{
    ::Sleep(millis);
}