match thread.inner.state.compare_exchange(EMPTY, PARKED, SeqCst, SeqCst) {
Ok(_) => {}
Err(NOTIFIED) => {
- thread.inner.state.store(EMPTY, SeqCst);
+ thread.inner.state.swap(EMPTY, SeqCst);
return;
} // should consume this notification, so prohibit spurious wakeups in next park.
Err(_) => panic!("inconsistent park state"),
match thread.inner.state.compare_exchange(EMPTY, PARKED, SeqCst, SeqCst) {
Ok(_) => {}
Err(NOTIFIED) => {
- thread.inner.state.store(EMPTY, SeqCst);
+ thread.inner.state.swap(EMPTY, SeqCst);
return;
} // should consume this notification, so prohibit spurious wakeups in next park.
Err(_) => panic!("inconsistent park_timeout state"),
/// [park]: fn.park.html
#[stable(feature = "rust1", since = "1.0.0")]
pub fn unpark(&self) {
- loop {
- match self.inner.state.compare_exchange(EMPTY, NOTIFIED, SeqCst, SeqCst) {
- Ok(_) => return, // no one was waiting
- Err(NOTIFIED) => return, // already unparked
- Err(PARKED) => {} // gotta go wake someone up
- _ => panic!("inconsistent state in unpark"),
- }
-
- // Coordinate wakeup through the mutex and a condvar notification
- let _lock = self.inner.lock.lock().unwrap();
- match self.inner.state.compare_exchange(PARKED, NOTIFIED, SeqCst, SeqCst) {
- Ok(_) => return self.inner.cvar.notify_one(),
- Err(NOTIFIED) => return, // a different thread unparked
- Err(EMPTY) => {} // parked thread went away, try again
- _ => panic!("inconsistent state in unpark"),
- }
+ match self.inner.state.swap(NOTIFIED, SeqCst) {
+ EMPTY => return, // no one was waiting
+ NOTIFIED => return, // already unparked
+ PARKED => {} // gotta go wake someone up
+ _ => panic!("inconsistent state in unpark"),
}
+
+ // Coordinate wakeup through the mutex and a condvar notification
+ let _lock = self.inner.lock.lock().unwrap();
+ self.inner.cvar.notify_one()
}
/// Gets the thread's unique identifier.