Boolean VNonVirtualCriticalSection::Lock()
{
VTaskID currentTaskID = VTask::GetCurrentID();
do {
VTaskID owner = (VTaskID) VInterlocked::CompareExchange((sLONG*) &fOwner, (sLONG) NULL_TASK_ID, (sLONG) currentTaskID);
if (owner == NULL_TASK_ID)
{
assert(fUseCount == 0);
fUseCount = 1;
}
else if (fOwner == currentTaskID)
{
++fUseCount;
}
else
{
sLONG unlockCount = sUnlockCount;
VSyncEvent* event = VInterlocked::ExchangePtr( &fEvent);
if (event != NULL)
{
event->Retain();
if (VInterlocked::CompareExchangePtr((void **)&fEvent, NULL, event) != NULL)
{
event->Unlock();
event->Release();
VTask::YieldNow();
}
else
{
while (VInterlocked::CompareExchange(&sUnlockCount, sUnlockCount, sUnlockCount) != sUnlockCount)
VTask::YieldNow();
if (sUnlockCount == unlockCount)
event->Lock( 100);
else
VTask::YieldNow();
}
event->Release();
}
else
{
event = new VSyncEvent;
if (VInterlocked::CompareExchangePtr((void **)&fEvent, NULL, event) != NULL)
{
event->Unlock();
event->Release();
VTask::YieldNow();
}
}
}
} while(fOwner != currentTaskID);
return true;
}
Boolean VSmallCriticalSection::Lock()
{
sWORD currentTaskID = (sWORD)VTask::GetCurrentID();
LongAsDoubleWord doubleWord;
doubleWord.first = (sWORD)currentTaskID;
doubleWord.second = 0;
do {
sLONG owner = VInterlocked::CompareExchange((sLONG*) &fOwner, (sLONG) 0, *((sLONG*) &doubleWord));
if (owner == 0)
{
assert(fUseCount == 0);
fUseCount = 1;
}
else if (fOwner == currentTaskID)
{
++fUseCount;
}
else
{
sLONG unlockCount = sUnlockCount;
VSyncEvent* event = VInterlocked::ExchangePtr(&fEvent);
if (event != NULL)
{
event->Retain();
if (VInterlocked::CompareExchangePtr((void**)&fEvent, NULL, event) != NULL)
{
event->Unlock();
VTask::YieldNow();
}
else
{
if (sUnlockCount == unlockCount)
event->Lock(100);
else
VTask::YieldNow();
}
event->Release();
}
else
{
event = new VSyncEvent;
if (VInterlocked::CompareExchangePtr((void**)&fEvent, NULL, event) != NULL)
{
event->Release();
VTask::YieldNow();
}
}
}
} while (fOwner != currentTaskID);
return true;
}
Boolean VSmallCriticalSection::Unlock()
{
//assert((fOwner == (sWORD)VTask::GetCurrentID()) && (fUseCount > 0) && (fUseCount < 32000L));
assert(fUseCount > 0);
VSyncEvent* event = NULL;
VInterlocked::Increment(&sUnlockCount);
// Unlock or another successfull lock can only be called from same thead (so no contention can occur on fUseCount)
if (--fUseCount == 0)
{
// capture currently set event
event = VInterlocked::ExchangePtr(&fEvent);
VTaskID owner = VInterlocked::Exchange((sLONG*) &fOwner, (sLONG) 0);
//assert(owner == VTask::GetCurrentID());
if (event != NULL)
{
event->Unlock();
event->Release();
}
}
return true;
}
Boolean VDBFlushMgr::NeedsBytes( VSize inNeededBytes)
{
Boolean isOK = false;
if (VTask::GetCurrent() != fFlushTask)
{
sLONG lastStamp = StartFlushStamp;
VTaskLock lock(&StartFlushMutex);
if (lastStamp == StartFlushStamp)
{
{
VSyncEvent* wait = NewFlushEnoughMemEvent(inNeededBytes);
Flush( false);
fNbWaitingClients++;
wait->Lock();
fNbWaitingClients--;
isOK = true;
StartFlushStamp++;
wait->Release();
}
}
else
isOK = true; // si le stamp a change, cela veut dire qu'une autre tache a deja demande au flush de liberer sur disk de l'espace
}
return isOK;
}
VError VJSContextPool::Clear()
{
VError err = VE_OK;
bool savedEnabledState = fEnabled; // save the enabled state
fEnabled = false;
VSyncEvent *syncEvent = WaitForNumberOfUsedContextEqualZero();
if (syncEvent != NULL)
{
syncEvent->Lock();
syncEvent->Release();
}
if (fPoolMutex.Lock())
{
for (MapOfJSContext_iter iter = fUnusedContexts.begin() ; iter != fUnusedContexts.end() ; ++iter)
{
xbox_assert(iter->second->IsReusable());
VJSGlobalObject *globalObject = iter->second->GetGlobalObject();
if (globalObject != NULL)
globalObject->GarbageCollect();
_ReleaseContext( iter->first);
delete iter->second;
--fReusableContextCount;
}
xbox_assert(fReusableContextCount == 0);
fUnusedContexts.clear();
fPoolMutex.Unlock();
}
fEnabled = savedEnabledState; // restore the enabled state
return err;
}
Boolean VNonVirtualCriticalSection::Unlock()
{
assert((fOwner == VTask::GetCurrentID()) && (fUseCount > 0) && (fUseCount < 32000L));
//assert(fUseCount > 0);
VSyncEvent* event = NULL;
VInterlocked::Increment(&sUnlockCount);
if (--fUseCount == 0)
{
event = VInterlocked::ExchangePtr(&fEvent);
VTaskID owner = VInterlocked::Exchange((sLONG*) &fOwner, (sLONG) NULL_TASK_ID);
//assert(owner == VTask::GetCurrentID());
if (event != NULL)
{
event->Unlock();
event->Release();
}
}
return true;
}
void VDBFlushMgr::Flush( Boolean inSynchronous, Boolean onlyForAllWritten)
{
#if debuglr == 101
if (fFlushProgress != nil && !fFlushProgress->IsManagerValid())
{
sLONG xdebug = 1; // put a break here
}
#endif
if (fFlushTask != nil)
{
if (inSynchronous)
{
#if trackClose
trackDebugMsg("call flush synchronous\n");
#endif
sLONG lastStamp = StartFlushStamp;
VSyncEvent* wait = nil;
{
{
VTaskLock lock(&StartFlushMutex);
if (lastStamp == StartFlushStamp)
{
if (onlyForAllWritten)
wait = NewFlushAllWrittenEvent();
else
wait = NewFlushEndEvent();
#if trackClose
trackDebugMsg("call flush synchronous after mutex\n");
#endif
Flush( false);
}
}
if (wait != nil)
{
wait->Lock();
wait->Release();
{
VTaskLock lock(&StartFlushMutex);
StartFlushStamp++;
}
}
#if trackClose
trackDebugMsg("end of call flush synchronous\n");
#endif
}
}
else // pas synchrone
{
#if trackClose
trackDebugMsg("call flush asynchronous\n");
#endif
if (StartFlushMutex.TryToLock())
{
#if trackClose
trackDebugMsg("call flush asynchronous after mutex\n");
#endif
{
VTaskLock lock(&DirtyMutext);
fIsAskingFlush = true;
//fFlushTask->WakeUp();
}
WakeUp();
StartFlushMutex.Unlock();
#if trackClose
trackDebugMsg("release mutext for call flush asynchronous\n");
#endif
}
}
}
}