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Read address atomically in WaitForAddress

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We didn't read the values for arbitration atomically in all cases as we should have, this consolidates the reading of the value and uses the value across all cases.
This commit is contained in:
PixelyIon 2022-11-26 00:16:52 +05:30 committed by Mark Collins
parent e8a1bd1aad
commit d0c56235f4
1 changed files with 3 additions and 3 deletions
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6
app/src/main/cpp/skyline/kernel/types/KProcess.cpp
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@ -288,14 +288,14 @@ namespace skyline::kernel::type {
{
std::scoped_lock lock{syncWaiterMutex};
u32 userValue{__atomic_load_n(address, __ATOMIC_SEQ_CST)};
switch (type) {
case ArbitrationType::WaitIfLessThan:
if (*address >= value) [[unlikely]]
if (userValue >= value) [[unlikely]]
return result::InvalidState;
break;
case ArbitrationType::DecrementAndWaitIfLessThan: {
u32 userValue{__atomic_load_n(address, __ATOMIC_SEQ_CST)};
do {
if (value <= userValue) [[unlikely]] // We want to explicitly decrement **after** the check
return result::InvalidState;
@ -304,7 +304,7 @@ namespace skyline::kernel::type {
}
case ArbitrationType::WaitIfEqual:
if (*address != value) [[unlikely]]
if (userValue != value) [[unlikely]]
return result::InvalidState;
break;
}