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Fix KProcess/SetThreadPriority PI CAS

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The condition for exiting the CAS loops is incorrect in several places which leads to additional loops, while this doesn't make the behavior incorrect it does lead to redundant iterations. 

Co-authored-by: Billy Laws <blaws05@gmail.com>
This commit is contained in:
PixelyIon 2022-08-04 15:54:37 +05:30
parent 8fc3cc7a16
commit 68615703c1
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2 changed files with 3 additions and 3 deletions
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2
app/src/main/cpp/skyline/kernel/svc.cpp
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@ -365,7 +365,7 @@ namespace skyline::kernel::svc {
// If the new priority is equivalent to the current priority then we don't need to CAS
newPriority = thread->priority.load();
newPriority = std::min(newPriority, priority);
} while (newPriority != priority && thread->priority.compare_exchange_strong(newPriority, priority));
} while (newPriority != priority && !thread->priority.compare_exchange_strong(newPriority, priority));
state.scheduler->UpdatePriority(thread);
thread->UpdatePriorityInheritance();
}

4
app/src/main/cpp/skyline/kernel/types/KProcess.cpp
View File

@ -181,7 +181,7 @@ namespace skyline::kernel::type {
do {
basePriority = state.thread->basePriority.load();
newPriority = std::min(basePriority, highestPriorityThread->priority.load());
} while (basePriority != newPriority && state.thread->priority.compare_exchange_strong(basePriority, newPriority));
} while (basePriority != newPriority && !state.thread->priority.compare_exchange_strong(basePriority, newPriority));
state.scheduler->UpdatePriority(state.thread);
} else {
i8 priority, basePriority;
@ -199,7 +199,7 @@ namespace skyline::kernel::type {
do {
ownerPriority = nextOwner->priority.load();
priority = std::min(ownerPriority, nextWaiter->priority.load());
} while (ownerPriority != priority && nextOwner->priority.compare_exchange_strong(ownerPriority, priority));
} while (ownerPriority != priority && !nextOwner->priority.compare_exchange_strong(ownerPriority, priority));
__atomic_store_n(mutex, nextOwner->waitTag | HandleWaitersBit, __ATOMIC_SEQ_CST);
} else {