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Mutex: Properly lock the mutex when a thread enters it
Also resume only the next immediate thread waiting for the mutex when it is released, instead of resuming them all.
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e3c8e4901c
1 changed files with 9 additions and 12 deletions
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@ -27,17 +27,13 @@ public:
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std::vector<Handle> waiting_threads; ///< Threads that are waiting for the mutex
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std::string name; ///< Name of mutex (optional)
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ResultVal<bool> SyncRequest() override {
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// TODO(bunnei): ImplementMe
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locked = true;
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return MakeResult<bool>(false);
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}
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ResultVal<bool> WaitSynchronization() override {
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// TODO(bunnei): ImplementMe
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bool wait = locked;
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if (locked) {
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Kernel::WaitCurrentThread(WAITTYPE_MUTEX, GetHandle());
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} else {
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// Lock the mutex when the first thread accesses it
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locked = true;
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}
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return MakeResult<bool>(wait);
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@ -90,16 +86,17 @@ bool ReleaseMutex(Mutex* mutex) {
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MutexEraseLock(mutex);
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// Find the next waiting thread for the mutex...
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while (!mutex->waiting_threads.empty()) {
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if (mutex->waiting_threads.empty()) {
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// Reset mutex lock thread handle, nothing is waiting
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mutex->locked = false;
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mutex->lock_thread = -1;
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} else {
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// Resume the next waiting thread and re-lock the mutex
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std::vector<Handle>::iterator iter = mutex->waiting_threads.begin();
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ReleaseMutexForThread(mutex, *iter);
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mutex->waiting_threads.erase(iter);
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}
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// Reset mutex lock thread handle, nothing is waiting
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mutex->locked = false;
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mutex->lock_thread = -1;
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return true;
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}
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