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libcortex_a9: added `try_lock` for mutex.

This commit is contained in:
pca006132 2020-07-15 16:41:28 +08:00
parent 191abf6b8f
commit 074438c3c7
1 changed files with 9 additions and 0 deletions
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9
libcortex_a9/src/mutex.rs
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@ -48,6 +48,15 @@ impl<T> Mutex<T> {
MutexGuard { mutex: self } MutexGuard { mutex: self }
} }
pub fn try_lock(&self) -> Option<MutexGuard<T>> {
if self.locked.compare_and_swap(UNLOCKED, LOCKED, Ordering::Acquire) != UNLOCKED {
None
} else {
dmb();
Some(MutexGuard { mutex: self })
}
}
fn unlock(&self) { fn unlock(&self) {
dmb(); dmb();
self.locked.store(UNLOCKED, Ordering::Release); self.locked.store(UNLOCKED, Ordering::Release);