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Optimize resched with a running thread.

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Esp. if it would go back to itself.
This commit is contained in:
Unknown W. Brackets 2013-04-07 11:03:16 -07:00
parent e246ffe20c
commit c7020d4872
1 changed files with 26 additions and 15 deletions
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41
Core/HLE/sceKernelThread.cpp
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@ -489,6 +489,20 @@ struct ThreadQueueList
return 0;
}
inline SceUID pop_first_better(u32 priority)
{
Queue *cur = first;
Queue *stop = &queues[priority];
while (cur < stop)
{
if (cur->end - cur->first > 0)
return cur->data[cur->first++];
cur = cur->next;
}
return 0;
}
inline void push_front(u32 priority, const SceUID threadID)
{
Queue *cur = &queues[priority];
@ -1499,15 +1513,23 @@ u32 __KernelDeleteThread(SceUID threadID, int exitStatus, const char *reason, bo
return kernelObjects.Destroy<Thread>(threadID);
}
// Returns NULL if the current thread is fine.
Thread *__KernelNextThread() {
SceUID bestThread;
// If the current thread is running, it's a valid candidate.
Thread *cur = __GetCurrentThread();
if (cur && cur->isRunning())
__KernelChangeReadyState(cur, currentThread, true);
{
bestThread = threadReadyQueue.pop_first_better(cur->nt.currentPriority);
if (bestThread != 0)
__KernelChangeReadyState(cur, currentThread, true);
}
else
bestThread = threadReadyQueue.pop_first();
// Assume threadReadyQueue has not become corrupt.
SceUID bestThread = threadReadyQueue.pop_first();
if (bestThread != -1)
if (bestThread != 0)
return kernelObjects.GetFast<Thread>(bestThread);
else
return 0;
@ -1537,21 +1559,10 @@ void __KernelReSchedule(const char *reason)
return;
}
retry:
Thread *nextThread = __KernelNextThread();
if (nextThread)
{
__KernelSwitchContext(nextThread, reason);
return;
}
else
{
// This shouldn't happen anymore now that we have idle threads.
_dbg_assert_msg_(HLE,0,"No threads available to schedule! There should be at least one idle thread available.");
CoreTiming::Idle();
goto retry;
}
// Otherwise, no need to switch.
}
void __KernelReSchedule(bool doCallbacks, const char *reason)