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Kernel/Mutex: Don't duplicate threads in the mutex waiter list.
Exit from AddMutexWaiter early if the thread is already waiting for a mutex owned by the owner thread. This accounts for the possibility of a thread that is waiting on a condition variable being awakened twice in a row. Also added more validation asserts. This should fix one of the random crashes in Breath Of The Wild.
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5926fbd3d7
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5224cc49c4
2 changed files with 22 additions and 2 deletions
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@ -706,8 +706,7 @@ static ResultCode SignalProcessWideKey(VAddr condition_variable_addr, s32 target
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Handle owner_handle = static_cast<Handle>(mutex_val & Mutex::MutexOwnerMask);
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auto owner = g_handle_table.Get<Thread>(owner_handle);
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ASSERT(owner);
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ASSERT(thread->status != ThreadStatus::Running);
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thread->status = ThreadStatus::WaitMutex;
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ASSERT(thread->status == ThreadStatus::WaitMutex);
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thread->wakeup_callback = nullptr;
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owner->AddMutexWaiter(thread);
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@ -419,12 +419,33 @@ VAddr Thread::GetCommandBufferAddress() const {
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}
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void Thread::AddMutexWaiter(SharedPtr<Thread> thread) {
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if (thread->lock_owner == this) {
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// If the thread is already waiting for this thread to release the mutex, ensure that the
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// waiters list is consistent and return without doing anything.
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auto itr = std::find(wait_mutex_threads.begin(), wait_mutex_threads.end(), thread);
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ASSERT(itr != wait_mutex_threads.end());
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return;
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}
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// A thread can't wait on two different mutexes at the same time.
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ASSERT(thread->lock_owner == nullptr);
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// Ensure that the thread is not already in the list of mutex waiters
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auto itr = std::find(wait_mutex_threads.begin(), wait_mutex_threads.end(), thread);
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ASSERT(itr == wait_mutex_threads.end());
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thread->lock_owner = this;
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wait_mutex_threads.emplace_back(std::move(thread));
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UpdatePriority();
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}
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void Thread::RemoveMutexWaiter(SharedPtr<Thread> thread) {
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ASSERT(thread->lock_owner == this);
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// Ensure that the thread is in the list of mutex waiters
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auto itr = std::find(wait_mutex_threads.begin(), wait_mutex_threads.end(), thread);
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ASSERT(itr != wait_mutex_threads.end());
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boost::remove_erase(wait_mutex_threads, thread);
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thread->lock_owner = nullptr;
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UpdatePriority();
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