You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
70 lines
2.7 KiB
70 lines
2.7 KiB
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT |
|
// file at the top-level directory of this distribution and at |
|
// http://rust-lang.org/COPYRIGHT. |
|
// |
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
|
// option. This file may not be copied, modified, or distributed |
|
// except according to those terms. |
|
|
|
use time::Duration; |
|
use sys_common::mutex::{self, Mutex}; |
|
use sys::condvar as imp; |
|
|
|
/// An OS-based condition variable. |
|
/// |
|
/// This structure is the lowest layer possible on top of the OS-provided |
|
/// condition variables. It is consequently entirely unsafe to use. It is |
|
/// recommended to use the safer types at the top level of this crate instead of |
|
/// this type. |
|
pub struct Condvar(imp::Condvar); |
|
|
|
impl Condvar { |
|
/// Creates a new condition variable for use. |
|
/// |
|
/// Behavior is undefined if the condition variable is moved after it is |
|
/// first used with any of the functions below. |
|
pub const fn new() -> Condvar { Condvar(imp::Condvar::new()) } |
|
|
|
/// Prepares the condition variable for use. |
|
/// |
|
/// This should be called once the condition variable is at a stable memory |
|
/// address. |
|
#[inline] |
|
pub unsafe fn init(&mut self) { self.0.init() } |
|
|
|
/// Signals one waiter on this condition variable to wake up. |
|
#[inline] |
|
pub unsafe fn notify_one(&self) { self.0.notify_one() } |
|
|
|
/// Awakens all current waiters on this condition variable. |
|
#[inline] |
|
pub unsafe fn notify_all(&self) { self.0.notify_all() } |
|
|
|
/// Waits for a signal on the specified mutex. |
|
/// |
|
/// Behavior is undefined if the mutex is not locked by the current thread. |
|
/// Behavior is also undefined if more than one mutex is used concurrently |
|
/// on this condition variable. |
|
#[inline] |
|
pub unsafe fn wait(&self, mutex: &Mutex) { self.0.wait(mutex::raw(mutex)) } |
|
|
|
/// Waits for a signal on the specified mutex with a timeout duration |
|
/// specified by `dur` (a relative time into the future). |
|
/// |
|
/// Behavior is undefined if the mutex is not locked by the current thread. |
|
/// Behavior is also undefined if more than one mutex is used concurrently |
|
/// on this condition variable. |
|
#[inline] |
|
pub unsafe fn wait_timeout(&self, mutex: &Mutex, dur: Duration) -> bool { |
|
self.0.wait_timeout(mutex::raw(mutex), dur) |
|
} |
|
|
|
/// Deallocates all resources associated with this condition variable. |
|
/// |
|
/// Behavior is undefined if there are current or will be future users of |
|
/// this condition variable. |
|
#[inline] |
|
pub unsafe fn destroy(&self) { self.0.destroy() } |
|
}
|
|
|