[Zion] Update FIXME in threading.
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78624d5291
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@ -69,7 +69,7 @@ void Thread::Exit() {
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#endif
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#endif
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state_ = FINISHED;
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state_ = FINISHED;
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process_.CheckState();
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process_.CheckState();
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while (!blocked_threads_.size() == 0) {
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while (blocked_threads_.size() != 0) {
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auto thread = blocked_threads_.PopFront();
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auto thread = blocked_threads_.PopFront();
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thread->SetState(Thread::RUNNABLE);
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thread->SetState(Thread::RUNNABLE);
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gScheduler->Enqueue(thread);
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gScheduler->Enqueue(thread);
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@ -78,7 +78,16 @@ void Thread::Exit() {
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}
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}
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void Thread::Wait() {
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void Thread::Wait() {
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// FIXME: We need synchronization code here.
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// TODO: We need synchronization code here.
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// Race condition is for A waiting on B.
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// 1. A checks if B is finished.
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// 2. Context Switch A -> B
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// 3. B finishes.
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// 4. Context Switch B -> A
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// 5. A forever blocks on B.
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if (state_ == Thread::FINISHED) {
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return;
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}
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auto thread = gScheduler->CurrentThread();
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auto thread = gScheduler->CurrentThread();
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thread->SetState(Thread::BLOCKED);
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thread->SetState(Thread::BLOCKED);
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blocked_threads_.PushBack(thread);
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blocked_threads_.PushBack(thread);
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