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#[cfg_attr(test, macro_use)]
extern crate may;
use std::sync::atomic::Ordering;
use std::time::Duration;
use std::{fmt, io};
use may::coroutine;
use may::sync::{AtomicOption, Blocker};
mod waiter_map;
pub struct Waiter<T> {
blocker: Blocker,
rsp: AtomicOption<T>,
}
impl<T> Waiter<T> {
pub fn new() -> Self {
Waiter {
blocker: Blocker::new(false),
rsp: AtomicOption::none(),
}
}
pub fn set_rsp(&self, rsp: T) {
self.rsp.swap(rsp, Ordering::Release);
self.blocker.unpark();
}
pub fn cancel_wait(&self) {
self.blocker.unpark()
}
pub fn wait_rsp<D: Into<Option<Duration>>>(&self, timeout: D) -> io::Result<T> {
use coroutine::ParkError;
use io::{Error, ErrorKind};
match self.blocker.park(timeout.into()) {
Ok(_) => self
.rsp
.take(Ordering::Acquire)
.ok_or_else(|| Error::new(io::ErrorKind::NotFound, "wait rsp cancelled")),
Err(ParkError::Timeout) => Err(Error::new(ErrorKind::TimedOut, "wait rsp timeout")),
Err(ParkError::Canceled) => {
coroutine::trigger_cancel_panic();
}
}
}
}
impl<T> fmt::Debug for Waiter<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "Waiter{{ ... }}")
}
}
impl<T> Default for Waiter<T> {
fn default() -> Self {
Waiter::new()
}
}
pub use waiter_map::{WaiterGuard, WaiterMap};