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Kernel: Fix Lock racing to the WaitQueue
There was a time window between releasing Lock::m_lock and calling into the lock's WaitQueue where someone else could take m_lock and bring two threads into a deadlock situation. Fix this issue by holding Lock::m_lock until interrupts are disabled by either Thread::wait_on() or WaitQueue::wake_one().
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5 changed files with 13 additions and 10 deletions
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@ -1,5 +1,6 @@
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#pragma once
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#include <AK/Atomic.h>
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#include <AK/SinglyLinkedList.h>
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#include <Kernel/Thread.h>
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@ -9,7 +10,7 @@ public:
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~WaitQueue();
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void enqueue(Thread&);
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void wake_one();
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void wake_one(Atomic<bool>* lock = nullptr);
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void wake_all();
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private:
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