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// 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 cell::UnsafeCell;
use libc;
use sys::mutex::{mod, Mutex};
use sys::sync as ffi;
use time::Duration;
pub struct Condvar { inner: UnsafeCell<ffi::pthread_cond_t> }
pub const CONDVAR_INIT: Condvar = Condvar {
inner: UnsafeCell { value: ffi::PTHREAD_COND_INITIALIZER },
};
impl Condvar {
#[inline]
pub unsafe fn new() -> Condvar {
// Might be moved and address is changing it is better to avoid
// initialization of potentially opaque OS data before it landed
Condvar { inner: UnsafeCell::new(ffi::PTHREAD_COND_INITIALIZER) }
}
#[inline]
pub unsafe fn notify_one(&self) {
let r = ffi::pthread_cond_signal(self.inner.get());
debug_assert_eq!(r, 0);
}
#[inline]
pub unsafe fn notify_all(&self) {
let r = ffi::pthread_cond_broadcast(self.inner.get());
debug_assert_eq!(r, 0);
}
#[inline]
pub unsafe fn wait(&self, mutex: &Mutex) {
let r = ffi::pthread_cond_wait(self.inner.get(), mutex::raw(mutex));
debug_assert_eq!(r, 0);
}
pub unsafe fn wait_timeout(&self, mutex: &Mutex, dur: Duration) -> bool {
assert!(dur >= Duration::nanoseconds(0));
// First, figure out what time it currently is
let mut tv = libc::timeval { tv_sec: 0, tv_usec: 0 };
let r = ffi::gettimeofday(&mut tv, 0 as *mut _);
debug_assert_eq!(r, 0);
// Offset that time with the specified duration
let abs = Duration::seconds(tv.tv_sec as i64) +
Duration::microseconds(tv.tv_usec as i64) +
dur;
let ns = abs.num_nanoseconds().unwrap() as u64;
let timeout = libc::timespec {
tv_sec: (ns / 1000000000) as libc::time_t,
tv_nsec: (ns % 1000000000) as libc::c_long,
};
// And wait!
let r = ffi::pthread_cond_timedwait(self.inner.get(), mutex::raw(mutex),
&timeout);
if r != 0 {
debug_assert_eq!(r as int, libc::ETIMEDOUT as int);
false
} else {
true
}
}
#[inline]
pub unsafe fn destroy(&self) {
let r = ffi::pthread_cond_destroy(self.inner.get());
debug_assert_eq!(r, 0);
}
}
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