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[xboxkrnl] ExAcquireReadWriteLockExclusive fixes. 

[xboxkrnl] ExAcquireReadWriteLockExclusive fixes:
- Don't unnecessarily double-load lock count.
- Don't release spin lock before we're done with the lock.
This commit is contained in:
gibbed 2022-01-07 09:12:54 -06:00 committed by Rick Gibbed
parent fa774f1d86
commit b4f35635c5
1 changed files with 8 additions and 6 deletions
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14
src/xenia/kernel/xboxkrnl/xboxkrnl_threading.cc
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@ -1184,18 +1184,20 @@ DECLARE_XBOXKRNL_EXPORT1(ExInitializeReadWriteLock, kThreading, kImplemented);
void ExAcquireReadWriteLockExclusive(pointer_t<X_ERWLOCK> lock_ptr) {
auto old_irql = xeKeKfAcquireSpinLock(&lock_ptr->spin_lock);
lock_ptr->lock_count++;
xeKeKfReleaseSpinLock(&lock_ptr->spin_lock, old_irql);
if (!lock_ptr->lock_count) {
int32_t lock_count = ++lock_ptr->lock_count;
if (!lock_count) {
xeKeKfReleaseSpinLock(&lock_ptr->spin_lock, old_irql);
return;
}
lock_ptr->writers_waiting_count++;
xeKeWaitForSingleObject(&lock_ptr->writer_event, 0, 0, 0, nullptr);
xeKeKfReleaseSpinLock(&lock_ptr->spin_lock, old_irql);
xeKeWaitForSingleObject(&lock_ptr->writer_event, 7, 0, 0, nullptr);
}
DECLARE_XBOXKRNL_EXPORT3(ExAcquireReadWriteLockExclusive, kThreading,
kImplemented, kBlocking, kSketchy);
DECLARE_XBOXKRNL_EXPORT2(ExAcquireReadWriteLockExclusive, kThreading,
kImplemented, kBlocking);
void ExReleaseReadWriteLock(pointer_t<X_ERWLOCK> lock_ptr) {
auto old_irql = xeKeKfAcquireSpinLock(&lock_ptr->spin_lock);