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Code Issues Releases Activity

kern: KConditionVariable::SignalToAddress now emits dmb before userspace write

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This commit is contained in:
Michael Scire 2023-02-21 10:42:24 -07:00
parent 709e1969bb
commit 819f7edc70
1 changed files with 19 additions and 18 deletions
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37
libraries/libmesosphere/source/kern_k_condition_variable.cpp
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@ -78,7 +78,7 @@ namespace ams::kern {
/* Remove waiter thread. */
s32 num_waiters;
KThread *next_owner_thread = owner_thread->RemoveWaiterByKey(std::addressof(num_waiters), addr);
KThread * const next_owner_thread = owner_thread->RemoveWaiterByKey(std::addressof(num_waiters), addr);
/* Determine the next tag. */
u32 next_value = 0;
@ -87,24 +87,25 @@ namespace ams::kern {
if (num_waiters > 1) {
next_value |= ams::svc::HandleWaitMask;
}
/* Write the value to userspace. */
Result result;
if (AMS_LIKELY(WriteToUser(addr, std::addressof(next_value)))) {
result = ResultSuccess();
} else {
result = svc::ResultInvalidCurrentMemory();
}
/* Signal the next owner thread. */
next_owner_thread->EndWait(result);
R_RETURN(result);
} else {
/* Just write the value to userspace. */
R_UNLESS(WriteToUser(addr, std::addressof(next_value)), svc::ResultInvalidCurrentMemory());
R_SUCCEED();
}
/* Synchronize memory before proceeding. */
cpu::DataMemoryBarrierInnerShareable();
/* Write the value to userspace. */
Result result;
if (AMS_LIKELY(WriteToUser(addr, std::addressof(next_value)))) {
result = ResultSuccess();
} else {
result = svc::ResultInvalidCurrentMemory();
}
/* If necessary, signal the next owner thread. */
if (next_owner_thread != nullptr) {
next_owner_thread->EndWait(result);
}
R_RETURN(result);
}
}