pub fn try_pop(&self) -> Option<T> {
        let txn = self.available.sub();
        let permit = self.pop_semaphore.try_acquire().ok()?;
        let item = Some(self.queue.pop().unwrap());
        txn.commit();
        permit.forget();
        self.push_semaphore.add_permits(1);
        item
    }
/// Try to get an item from the queue. If the queue is currently
/// empty return None instead.
Try to get an item from the queue. If the queue is currently
empty return None instead.
Try to get an item from the queue . If the queue is currently empty return None instead .
pub fn try_pop(&self) -> Option<T> {
        let txn = self.available.sub();
        let permit = self.pop_semaphore.try_acquire().ok()?;
        let item = Some(self.queue.pop().unwrap());
        txn.commit();
        permit.forget();
        self.push_semaphore.add_permits(1);
        item
    }
pub fn try_pop ( & self ) -> Option < T > { let txn = self . available . sub ( ) ; let permit = self . pop_semaphore . try_acquire ( ) . ok ( ) ? ; let item = Some ( self . queue . pop ( ) . unwrap ( ) ) ; txn . commit ( ) ; permit . forget ( ) ; self . push_semaphore . add_permits ( 1 ) ; item }
Try to get an item from the queue.
Try to get an item from the queue .
&self
&self