WriteGuard ReadWriteLock::TryWrite()
{
const u32 lock_key(EXCL_ENCODE(exclusive_write, 0));
const bool success = (atomic_compare_and_swap(&mMutualExclusivityMask, exclusive_none, lock_key) == exclusive_none);
if (success)
mWriteEntryThread = GetCurrentThreadId();
return success ? WriteGuard(this) : WriteGuard(nullptr);
}
WriteGuard ReadWriteLock::Write()
{
const ThreadID threadID = GetCurrentThreadId();
const u32 lock_key(EXCL_ENCODE(exclusive_write, 0));
while (atomic_compare_and_swap(&mMutualExclusivityMask, exclusive_none, lock_key) != exclusive_none)
{
if (threadID == mWriteEntryThread)
{
atomic_increment((u32*)&mReentrancyCount);
break;
}
cond_wait();
}
KS_ASSERT(mWriteEntryThread == 0 || mWriteEntryThread == threadID);
mWriteEntryThread = threadID;
return WriteGuard(this);
}
inline WriteGuard write_guard() {
return WriteGuard(this);
}
