| // Copyright 2018 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| use std::fmt::{self, Debug}; |
| use std::sync::{Condvar as StdCondvar, MutexGuard}; |
| |
| /// A Condition Variable. |
| #[derive(Default)] |
| pub struct Condvar { |
| std: StdCondvar, |
| } |
| |
| impl Condvar { |
| /// Creates a new condvar that is ready to be waited on. |
| pub fn new() -> Condvar { |
| Condvar { |
| std: StdCondvar::new(), |
| } |
| } |
| |
| /// Waits on a condvar, blocking the current thread until it is notified. |
| pub fn wait<'a, T>(&self, guard: MutexGuard<'a, T>) -> MutexGuard<'a, T> { |
| match self.std.wait(guard) { |
| Ok(guard) => guard, |
| Err(_) => panic!("condvar is poisoned"), |
| } |
| } |
| |
| /// Notifies one thread blocked by this condvar. |
| pub fn notify_one(&self) { |
| self.std.notify_one(); |
| } |
| |
| /// Notifies all threads blocked by this condvar. |
| pub fn notify_all(&self) { |
| self.std.notify_all(); |
| } |
| } |
| |
| impl Debug for Condvar { |
| fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result { |
| Debug::fmt(&self.std, formatter) |
| } |
| } |