Kernel/Mutex: Update a mutex priority when a thread stops waiting on it.
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@ -3,7 +3,6 @@
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// Refer to the license.txt file included.
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#include <algorithm>
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#include <boost/range/algorithm_ext/erase.hpp>
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#include "common/assert.h"
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#include "common/logging/log.h"
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#include "core/hle/config_mem.h"
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@ -34,10 +33,17 @@ void WaitObject::RemoveWaitingThread(Thread* thread) {
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SharedPtr<Thread> WaitObject::GetHighestPriorityReadyThread() {
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// Remove the threads that are ready or already running from our waitlist
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boost::range::remove_erase_if(waiting_threads, [](const SharedPtr<Thread>& thread) {
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return thread->status == THREADSTATUS_RUNNING || thread->status == THREADSTATUS_READY ||
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auto to_remove = waiting_threads.end();
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do {
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to_remove = std::find_if(waiting_threads.begin(), waiting_threads.end(),
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[](const SharedPtr<Thread>& thread) {
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return thread->status == THREADSTATUS_RUNNING ||
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thread->status == THREADSTATUS_READY ||
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thread->status == THREADSTATUS_DEAD;
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});
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// Call RemoveWaitingThread so that child classes can override the behavior.
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RemoveWaitingThread(to_remove->get());
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} while (to_remove != waiting_threads.end());
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Thread* candidate = nullptr;
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s32 candidate_priority = THREADPRIO_LOWEST + 1;
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@ -49,9 +55,10 @@ SharedPtr<Thread> WaitObject::GetHighestPriorityReadyThread() {
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if (ShouldWait(thread.get()))
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continue;
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bool ready_to_run =
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std::none_of(thread->wait_objects.begin(), thread->wait_objects.end(),
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[&thread](const SharedPtr<WaitObject>& object) { return object->ShouldWait(thread.get()); });
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bool ready_to_run = std::none_of(thread->wait_objects.begin(), thread->wait_objects.end(),
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[&thread](const SharedPtr<WaitObject>& object) {
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return object->ShouldWait(thread.get());
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});
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if (ready_to_run) {
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candidate = thread.get();
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candidate_priority = thread->current_priority;
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@ -151,7 +151,7 @@ public:
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* Removes a thread from waiting on this object (e.g. if it was resumed already)
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* @param thread Pointer to thread to remove
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*/
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void RemoveWaitingThread(Thread* thread);
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virtual void RemoveWaitingThread(Thread* thread);
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/**
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* Wake up all threads waiting on this object that can be awoken, in priority order,
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@ -28,6 +28,23 @@ static void UpdateThreadPriority(Thread* thread) {
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thread->SetPriority(best_priority);
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}
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/**
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* Elevate the mutex priority to the best priority
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* among the priorities of all its waiting threads.
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*/
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static void UpdateMutexPriority(Mutex* mutex) {
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s32 best_priority = THREADPRIO_LOWEST;
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for (auto& waiter : mutex->GetWaitingThreads()) {
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if (waiter->current_priority < best_priority)
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best_priority = waiter->current_priority;
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}
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if (best_priority != mutex->priority) {
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mutex->priority = best_priority;
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UpdateThreadPriority(mutex->holding_thread.get());
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}
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}
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void ReleaseThreadMutexes(Thread* thread) {
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for (auto& mtx : thread->held_mutexes) {
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mtx->lock_count = 0;
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@ -93,20 +110,12 @@ void Mutex::Release() {
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void Mutex::AddWaitingThread(SharedPtr<Thread> thread) {
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WaitObject::AddWaitingThread(thread);
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// Elevate the mutex priority to the best priority
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// among the priorities of all its waiting threads.
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s32 best_priority = THREADPRIO_LOWEST;
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for (auto& waiter : GetWaitingThreads()) {
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if (waiter->current_priority < best_priority)
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best_priority = waiter->current_priority;
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UpdateMutexPriority(this);
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}
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if (best_priority != priority) {
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priority = best_priority;
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UpdateThreadPriority(holding_thread.get());
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}
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void Mutex::RemoveWaitingThread(Thread* thread) {
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WaitObject::RemoveWaitingThread(thread);
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UpdateMutexPriority(this);
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}
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} // namespace
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@ -43,6 +43,7 @@ public:
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void Acquire(Thread* thread) override;
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void AddWaitingThread(SharedPtr<Thread> thread) override;
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void RemoveWaitingThread(Thread* thread) override;
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void Release();
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@ -373,8 +373,9 @@ static ResultCode WaitSynchronizationN(s32* out, Kernel::Handle* handles, s32 ha
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return ERR_SYNC_TIMEOUT;
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} else {
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// Find the first object that is acquirable in the provided list of objects
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auto itr = std::find_if(objects.begin(), objects.end(),
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[thread](const ObjectPtr& object) { return !object->ShouldWait(thread); });
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auto itr = std::find_if(objects.begin(), objects.end(), [thread](const ObjectPtr& object) {
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return !object->ShouldWait(thread);
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});
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if (itr != objects.end()) {
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// We found a ready object, acquire it and set the result value
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