Kernel: Implemented priority inheritance for mutexes.
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@ -56,7 +56,15 @@ SharedPtr<Mutex> Mutex::Create(bool initial_locked, std::string name) {
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}
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bool Mutex::ShouldWait() {
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return lock_count > 0 && holding_thread != GetCurrentThread();;
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auto thread = GetCurrentThread();
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bool wait = lock_count > 0 && holding_thread != thread;
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// If the holding thread of the mutex is lower priority than this thread, that thread should
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// temporarily inherit this thread's priority
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if (wait && thread->current_priority < holding_thread->current_priority)
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holding_thread->BoostPriority(thread->current_priority);
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return wait;
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}
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void Mutex::Acquire() {
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@ -156,9 +156,8 @@ static void PriorityBoostStarvedThreads() {
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u64 delta = current_ticks - thread->last_running_ticks;
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if (thread->status == THREADSTATUS_READY && delta > boost_timeout && !thread->idle) {
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const s32 boost_priority = std::max(ready_queue.get_first()->current_priority - 1, 0);
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ready_queue.move(thread, thread->current_priority, boost_priority);
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thread->current_priority = boost_priority;
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const s32 priority = std::max(ready_queue.get_first()->current_priority - 1, 0);
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thread->BoostPriority(priority);
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}
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}
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}
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@ -435,6 +434,11 @@ void Thread::SetPriority(s32 priority) {
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nominal_priority = current_priority = priority;
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}
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void Thread::BoostPriority(s32 priority) {
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ready_queue.move(this, current_priority, priority);
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current_priority = priority;
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}
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SharedPtr<Thread> SetupIdleThread() {
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// We need to pass a few valid values to get around parameter checking in Thread::Create.
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auto thread = Thread::Create("idle", Memory::KERNEL_MEMORY_VADDR, THREADPRIO_LOWEST, 0,
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@ -89,6 +89,12 @@ public:
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*/
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void SetPriority(s32 priority);
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/**
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* Temporarily boosts the thread's priority until the next time it is scheduled
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* @param priority The new priority
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*/
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void BoostPriority(s32 priority);
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/**
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* Gets the thread's thread ID
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* @return The thread's ID
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