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Code Issues Releases Activity

Kernel/Threads: A thread waking up by timeout from a WaitProcessWideKey may already have an assigned lock owner.

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This situation may happen like so:
Thread 1 with low priority calls WaitProcessWideKey with timeout.
Thread 2 with high priority calls WaitProcessWideKey without timeout.
Thread 3 calls SignalProcessWideKey
- Thread 2 acquires the lock and awakens.
- Thread 1 can't acquire the lock and is put to sleep with the lock owner being Thread 2.
Thread 1's timeout expires, with the lock owner still being set to Thread 2.
This commit is contained in:
Subv 2018-06-02 14:06:35 -05:00
parent bbbe34429e
commit 9cd87a6352
1 changed files with 5 additions and 2 deletions
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7
src/core/hle/kernel/thread.cpp
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@ -133,8 +133,11 @@ static void ThreadWakeupCallback(u64 thread_handle, int cycles_late) {
auto lock_owner = thread->lock_owner;
// Threads waking up by timeout from WaitProcessWideKey do not perform priority inheritance
// and don't have a lock owner.
ASSERT(lock_owner == nullptr);
// and don't have a lock owner unless SignalProcessWideKey was called first and the thread
// wasn't awakened due to the mutex already being acquired.
if (lock_owner) {
lock_owner->RemoveMutexWaiter(thread);
}
}
if (resume)