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extern crate time; use std::sync::{Mutex, Condvar, PoisonError, MutexGuard}; pub struct CondVar { pair: (Mutex<bool>, Condvar) } pub type CondVarResult<Guard> = Result<(), PoisonError<Guard>>; enum Notify { One, All, } impl ::CondVar { pub fn new() -> ::CondVar { ::CondVar { pair: (Mutex::new(false), Condvar::new()) } } pub fn notify_one(&self) { self.notify(Notify::One) } pub fn notify_all(&self) { self.notify(Notify::All) } fn notify(&self, notify: Notify) { let &(ref lock, ref cvar) = &self.pair; let mut predicate = lock.lock().unwrap(); *predicate = true; match notify { Notify::One => cvar.notify_one(), Notify::All => cvar.notify_all(), } } pub fn wait(&self) -> CondVarResult<MutexGuard<bool>> { let &(ref lock, ref cvar) = &self.pair; let mut predicate = try!(lock.lock()); while !*predicate { predicate = try!(cvar.wait(predicate)); } Ok(()) } pub fn wait_timeout_ms(&self, timeout_ms: i64) -> CondVarResult<(MutexGuard<bool>,bool)> { let &(ref lock, ref cvar) = &self.pair; let predicate = lock.lock(); match predicate { Err(poison) => return Err(PoisonError::new((poison.into_inner(),false))), _ => () } let mut predicate = predicate.unwrap(); let mut remaining_ms = timeout_ms; while !*predicate && remaining_ms > 0 { let before_ms = time::precise_time_ns()/1000; let (new, _) = try!(cvar.wait_timeout_ms(predicate, remaining_ms as u32)); predicate = new; let after_ms = time::precise_time_ns()/1000; remaining_ms -= (after_ms - before_ms) as i64; } Ok(()) } } #[cfg(test)] mod tests { use std::sync::Arc; use std::thread::{sleep_ms, spawn}; use time::get_time; use ::CondVar; #[test] fn test_wait() { let cvar1 = Arc::new(CondVar::new()); let cvar2 = cvar1.clone(); spawn(move || { cvar2.notify_one(); }); cvar1.wait().unwrap(); } #[test] fn test_wait_timeout_ms() { let cvar1 = Arc::new(CondVar::new()); let cvar2 = cvar1.clone(); spawn(move || { sleep_ms(500); cvar2.notify_one(); }); assert_eq!(cvar1.wait_timeout_ms(1000).unwrap(), ()); } #[test] fn test_wait_timeout_ms_fail() { let cvar1 = Arc::new(CondVar::new()); let cvar2 = cvar1.clone(); spawn(move || { sleep_ms(1000); cvar2.notify_one(); }); let t1 = get_time(); let t1: u64 = (t1.sec as u64)*1000 + (t1.nsec as u64)/1_000_000; cvar1.wait_timeout_ms(500).unwrap(); let t2 = get_time(); let t2: u64 = (t2.sec as u64)*1000 + (t2.nsec as u64)/1_000_000; if t2 - t1 > 1000 { panic!(); } } }