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// 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)
}
}
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