bool32 OSXDoNextWorkQueueEntry(platform_work_queue* Queue)
{
bool32 WeShouldSleep = false;
uint32 OriginalNextEntryToRead = Queue->NextEntryToRead;
uint32 NewNextEntryToRead = (OriginalNextEntryToRead + 1) % ArrayCount(Queue->Entries);
if(OriginalNextEntryToRead != Queue->NextEntryToWrite)
{
// NOTE(jeff): OSAtomicCompareAndSwapXXX functions return 1 if the swap took place, 0 otherwise!
uint32 SwapOccurred = OSAtomicCompareAndSwapIntBarrier(OriginalNextEntryToRead,
NewNextEntryToRead,
(int volatile*)&Queue->NextEntryToRead);
if (SwapOccurred)
{
platform_work_queue_entry Entry = Queue->Entries[OriginalNextEntryToRead];
Entry.Callback(Queue, Entry.Data);
//InterlockedIncrement((int volatile *)&Queue->CompletionCount);
OSAtomicIncrement32Barrier((int volatile *)&Queue->CompletionCount);
}
else
{
}
}
else
{
WeShouldSleep = true;
}
return(WeShouldSleep);
}
int OSAtomicCompareAndSwapLongBarrier(long oldValue,long newValue,volatile long* target) {
return OSAtomicCompareAndSwapIntBarrier((int)oldValue,(int)newValue,(volatile int*)target);
}
int OSAtomicCompareAndSwap32Barrier(int32_t oldValue,int32_t newValue,volatile int32_t* target) {
return OSAtomicCompareAndSwapIntBarrier((int)oldValue,(int)newValue,(volatile int*)target);
}
int OSAtomicCompareAndSwapPtrBarrier(void* oldValue,void* newValue,void* volatile* target) {
return OSAtomicCompareAndSwapIntBarrier((int)oldValue,(int)newValue,(volatile int*)target);
}