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Fix WaitForAddress timeout signal race

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A race could occur from the timeout path in `WaitForAddress` taking place at the same time as `SignalToAddress` has been caused, this causes a deadlock due to double-insertion.
This commit is contained in:
PixelyIon 2022-11-26 00:13:01 +05:30 committed by Mark Collins
parent 0f1d97fe2c
commit e8a1bd1aad
1 changed files with 7 additions and 2 deletions
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9
app/src/main/cpp/skyline/kernel/types/KProcess.cpp
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@ -320,13 +320,18 @@ namespace skyline::kernel::type {
std::scoped_lock lock{syncWaiterMutex};
auto queue{syncWaiters.equal_range(address)};
auto iterator{std::find(queue.first, queue.second, SyncWaiters::value_type{address, state.thread})};
if (iterator != queue.second)
if (iterator != queue.second) {
if (syncWaiters.erase(iterator) == queue.second)
// We need to update the boolean flag denoting that there are no more threads waiting on this address
__atomic_store_n(address, false, __ATOMIC_SEQ_CST);
} else {
state.scheduler->WaitSchedule(false);
return {};
}
}
state.scheduler->InsertThread(state.thread);
state.scheduler->WaitSchedule();
state.scheduler->WaitSchedule(false);
return result::TimedOut;
} else {