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// Copyright 2016 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.
// *Implementation adapted from `/sys/redox/condvar.rs`
use cell::UnsafeCell;
use intrinsics::atomic_cxchg;
use ptr;
use time::Duration;
use sys::mutex::{self, Mutex};
use libctru::synchronization::{__sync_get_arbiter, LightLock};
use libctru::svc::{svcArbitrateAddress, ArbitrationType};
pub struct Condvar {
lock: UnsafeCell<*mut LightLock>,
}
unsafe impl Send for Condvar {}
unsafe impl Sync for Condvar {}
impl Condvar {
pub const fn new() -> Condvar {
Condvar {
lock: UnsafeCell::new(ptr::null_mut()),
}
}
#[inline]
pub unsafe fn init(&self) {
*self.lock.get() = ptr::null_mut();
}
#[inline]
pub fn notify_one(&self) {
unsafe {
let arbiter = __sync_get_arbiter();
svcArbitrateAddress(arbiter,
*self.lock.get() as u32,
ArbitrationType::ARBITRATION_SIGNAL,
1,
0);
}
}
#[inline]
pub fn notify_all(&self) {
unsafe {
let lock = self.lock.get();
if *lock == ptr::null_mut() {
return;
}
let arbiter = __sync_get_arbiter();
svcArbitrateAddress(arbiter,
*self.lock.get() as u32,
ArbitrationType::ARBITRATION_SIGNAL,
-1,
0);
}
}
#[inline]
pub fn wait(&self, mutex: &Mutex) {
unsafe {
let lock = self.lock.get();
if *lock != mutex::raw(mutex) {
if *lock != ptr::null_mut() {
panic!("Condvar used with more than one Mutex");
}
atomic_cxchg(lock as *mut usize, 0, mutex::raw(mutex) as usize);
}
mutex.unlock();
let arbiter = __sync_get_arbiter();
svcArbitrateAddress(arbiter,
*self.lock.get() as u32,
ArbitrationType::ARBITRATION_WAIT_IF_LESS_THAN,
2,
0);
mutex.lock();
}
}
#[inline]
pub fn wait_timeout(&self, mutex: &Mutex, dur: Duration) -> bool {
use time::Instant;
unsafe {
let lock = self.lock.get();
if *lock != mutex::raw(mutex) {
if *lock != ptr::null_mut() {
panic!("Condvar used with more than one Mutex");
}
atomic_cxchg(lock as *mut usize, 0, mutex::raw(mutex) as usize);
}
let now = Instant::now();
let nanos = dur.as_secs() * 1_000_000_000 + dur.subsec_nanos() as u64;
mutex.unlock();
let arbiter = __sync_get_arbiter();
svcArbitrateAddress(arbiter,
*self.lock.get() as u32,
ArbitrationType::ARBITRATION_WAIT_IF_LESS_THAN_TIMEOUT,
2,
nanos as i64);
mutex.lock();
now.elapsed() < dur
}
}
#[inline]
pub unsafe fn destroy(&self) {
*self.lock.get() = ptr::null_mut();
}
}
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