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coreinit: Add reschedule special case to avoid a deadlock

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Fixes Just Dance 2019 locking up on boot
This commit is contained in:
Exzap 2024-05-06 09:15:36 +02:00
parent 7d6d417354
commit 065fb7eb58
1 changed files with 5 additions and 0 deletions
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src/Cafe/OS/libs/coreinit/coreinit_Thread.cpp
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@ -763,6 +763,11 @@ namespace coreinit
uint32 coreIndex = OSGetCoreId(); uint32 coreIndex = OSGetCoreId();
if (!newThread->context.hasCoreAffinitySet(coreIndex)) if (!newThread->context.hasCoreAffinitySet(coreIndex))
return false; return false;
// special case: if current and new thread are running only on the same core then reschedule even if priority is equal
// this resolves a deadlock in Just Dance 2019 where one thread would always reacquire the same mutex within it's timeslice, blocking another thread on the same core from acquiring it
if ((1<<coreIndex) == newThread->context.affinity && currentThread->context.affinity == newThread->context.affinity && currentThread->effectivePriority == newThread->effectivePriority)
return true;
// otherwise reschedule if new thread has higher priority
return newThread->effectivePriority < currentThread->effectivePriority; return newThread->effectivePriority < currentThread->effectivePriority;
} }