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// Copyright 2017 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 boxed::FnBox;
use ffi::CStr;
use io;
use sys::{unsupported, Void};
use time::Duration;
pub struct Thread(Void);
pub const DEFAULT_MIN_STACK_SIZE: usize = 4096;
impl Thread {
pub unsafe fn new<'a>(_stack: usize, _p: Box<dyn FnBox() + 'a>)
-> io::Result<Thread>
{
unsupported()
}
pub fn yield_now() {
// do nothing
}
pub fn set_name(_name: &CStr) {
// nope
}
#[cfg(not(target_feature = "atomics"))]
pub fn sleep(_dur: Duration) {
panic!("can't sleep");
}
#[cfg(target_feature = "atomics")]
pub fn sleep(dur: Duration) {
use arch::wasm32::atomic;
use cmp;
// Use an atomic wait to block the current thread artificially with a
// timeout listed. Note that we should never be notified (return value
// of 0) or our comparison should never fail (return value of 1) so we
// should always only resume execution through a timeout (return value
// 2).
let mut nanos = dur.as_nanos();
while nanos > 0 {
let amt = cmp::min(i64::max_value() as u128, nanos);
let mut x = 0;
let val = unsafe { atomic::wait_i32(&mut x, 0, amt as i64) };
debug_assert_eq!(val, 2);
nanos -= amt;
}
}
pub fn join(self) {
match self.0 {}
}
}
pub mod guard {
pub type Guard = !;
pub unsafe fn current() -> Option<Guard> { None }
pub unsafe fn init() -> Option<Guard> { None }
pub unsafe fn deinit() {}
}
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