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Check waitThread rather than waitMutex during condvar timeouts

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When a timeout occurs in `ConditionVariableWait`, we used to check `waitMutex` which is cleared by `MutexUnlock` but when we hit the CAS case in `ConditionVariableSignal` then we don't clear `waitMutex`. It's far more reliable to check `waitThread` as an indication for if the thread has already been unlocked as it's cleared at the start of `ConditionVariableWait` and would implicitly stay cleared in the CAS case while being set in `MutexLock` and being unset in `MutexUnlock`.
This commit is contained in:
PixelyIon 2022-11-30 03:13:39 +05:30 committed by Mark Collins
parent 2525bafe06
commit c4b4532222
1 changed files with 3 additions and 2 deletions
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5
app/src/main/cpp/skyline/kernel/types/KProcess.cpp
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@ -221,6 +221,7 @@ namespace skyline::kernel::type {
{
// Update all waiter information
std::unique_lock lock{state.thread->waiterMutex};
state.thread->waitThread = std::shared_ptr<KThread>{nullptr};
state.thread->waitMutex = mutex;
state.thread->waitTag = tag;
state.thread->waitConditionVariable = key;
@ -259,7 +260,7 @@ namespace skyline::kernel::type {
std::unique_lock lock{state.thread->waiterMutex};
if (state.thread->waitSignalled) {
if (state.thread->waitMutex) {
if (state.thread->waitThread) {
auto waitThread{state.thread->waitThread};
std::unique_lock waitLock{waitThread->waiterMutex, std::try_to_lock};
if (!waitLock) {
@ -284,7 +285,7 @@ namespace skyline::kernel::type {
shouldWait = true;
}
} else {
// If the waitMutex is null then we were signalled and are no longer waiting on the associated mutex
// If the waitThread is null then we were signalled and are no longer waiting on the associated mutex
shouldWait = true;
}
} else {