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[xboxkrnl] Implement ExAcquireRWLShared. 

[xboxkrnl] Implement ExAcquireReadWriteLockShared.
This commit is contained in:
gibbed 2022-01-07 09:19:47 -06:00 committed by Rick Gibbed
parent 3162a6435c
commit 1f9c434b5e
1 changed files with 19 additions and 0 deletions
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19
src/xenia/kernel/xboxkrnl/xboxkrnl_threading.cc
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@ -1217,6 +1217,25 @@ dword_result_t ExTryToAcquireReadWriteLockExclusive(
DECLARE_XBOXKRNL_EXPORT1(ExTryToAcquireReadWriteLockExclusive, kThreading,
kImplemented);
void ExAcquireReadWriteLockShared(pointer_t<X_ERWLOCK> lock_ptr) {
auto old_irql = xeKeKfAcquireSpinLock(&lock_ptr->spin_lock);
int32_t lock_count = ++lock_ptr->lock_count;
if (!lock_count ||
(lock_ptr->readers_entry_count && !lock_ptr->writers_waiting_count)) {
lock_ptr->readers_entry_count++;
xeKeKfReleaseSpinLock(&lock_ptr->spin_lock, old_irql);
return;
}
lock_ptr->readers_waiting_count++;
xeKeKfReleaseSpinLock(&lock_ptr->spin_lock, old_irql);
xeKeWaitForSingleObject(&lock_ptr->reader_semaphore, 7, 0, 0, nullptr);
}
DECLARE_XBOXKRNL_EXPORT2(ExAcquireReadWriteLockShared, kThreading, kImplemented,
kBlocking);
void ExReleaseReadWriteLock(pointer_t<X_ERWLOCK> lock_ptr) {
auto old_irql = xeKeKfAcquireSpinLock(&lock_ptr->spin_lock);