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Merge pull request #2410 from Subv/sleepthread
Don't yield execution in SleepThread(0) if there are no available threads to run
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commit
b5eac78b43
@ -508,6 +508,10 @@ SharedPtr<Thread> SetupMainThread(u32 entry_point, s32 priority) {
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return thread;
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return thread;
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}
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}
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bool HaveReadyThreads() {
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return ready_queue.get_first() != nullptr;
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}
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void Reschedule() {
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void Reschedule() {
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Thread* cur = GetCurrentThread();
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Thread* cur = GetCurrentThread();
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Thread* next = PopNextReadyThread();
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Thread* next = PopNextReadyThread();
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@ -218,6 +218,11 @@ private:
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*/
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*/
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SharedPtr<Thread> SetupMainThread(u32 entry_point, s32 priority);
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SharedPtr<Thread> SetupMainThread(u32 entry_point, s32 priority);
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/**
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* Returns whether there are any threads that are ready to run.
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*/
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bool HaveReadyThreads();
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/**
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/**
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* Reschedules to the next available thread (call after current thread is suspended)
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* Reschedules to the next available thread (call after current thread is suspended)
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*/
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*/
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@ -849,6 +849,11 @@ static ResultCode CancelTimer(Kernel::Handle handle) {
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static void SleepThread(s64 nanoseconds) {
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static void SleepThread(s64 nanoseconds) {
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LOG_TRACE(Kernel_SVC, "called nanoseconds=%lld", nanoseconds);
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LOG_TRACE(Kernel_SVC, "called nanoseconds=%lld", nanoseconds);
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// Don't attempt to yield execution if there are no available threads to run,
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// this way we avoid a useless reschedule to the idle thread.
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if (nanoseconds == 0 && !Kernel::HaveReadyThreads())
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return;
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// Sleep current thread and check for next thread to schedule
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// Sleep current thread and check for next thread to schedule
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Kernel::WaitCurrentThread_Sleep();
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Kernel::WaitCurrentThread_Sleep();
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