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use crate::cell::UnsafeCell;
use crate::sys::c;
use crate::sys::locks::{mutex, Mutex};
use crate::sys::os;
use crate::time::Duration;
pub struct Condvar {
inner: UnsafeCell<c::CONDITION_VARIABLE>,
}
unsafe impl Send for Condvar {}
unsafe impl Sync for Condvar {}
impl Condvar {
#[inline]
pub const fn new() -> Condvar {
Condvar { inner: UnsafeCell::new(c::CONDITION_VARIABLE_INIT) }
}
#[inline]
pub unsafe fn wait(&self, mutex: &Mutex) {
let r = c::SleepConditionVariableSRW(self.inner.get(), mutex::raw(mutex), c::INFINITE, 0);
debug_assert!(r != 0);
}
pub unsafe fn wait_timeout(&self, mutex: &Mutex, dur: Duration) -> bool {
let r = c::SleepConditionVariableSRW(
self.inner.get(),
mutex::raw(mutex),
crate::sys::windows::dur2timeout(dur),
0,
);
if r == 0 {
debug_assert_eq!(os::errno() as usize, c::ERROR_TIMEOUT as usize);
false
} else {
true
}
}
#[inline]
pub fn notify_one(&self) {
unsafe { c::WakeConditionVariable(self.inner.get()) }
}
#[inline]
pub fn notify_all(&self) {
unsafe { c::WakeAllConditionVariable(self.inner.get()) }
}
}
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