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#![deny(unsafe_op_in_unsafe_fn)]
use crate::ffi::CStr;
use crate::io;
use crate::mem;
use crate::num::NonZeroUsize;
use crate::sys::unsupported;
use crate::time::Duration;
pub struct Thread(!);
pub const DEFAULT_MIN_STACK_SIZE: usize = 4096;
impl Thread {
// unsafe: see thread::Builder::spawn_unchecked for safety requirements
pub unsafe fn new(_stack: usize, _p: Box<dyn FnOnce()>) -> io::Result<Thread> {
unsupported()
}
pub fn yield_now() {
let ret = unsafe { wasi::sched_yield() };
debug_assert_eq!(ret, Ok(()));
}
pub fn set_name(_name: &CStr) {
// nope
}
pub fn sleep(dur: Duration) {
let nanos = dur.as_nanos();
assert!(nanos <= u64::MAX as u128);
const USERDATA: wasi::Userdata = 0x0123_45678;
let clock = wasi::SubscriptionClock {
id: wasi::CLOCKID_MONOTONIC,
timeout: nanos as u64,
precision: 0,
flags: 0,
};
let in_ = wasi::Subscription {
userdata: USERDATA,
u: wasi::SubscriptionU { tag: 0, u: wasi::SubscriptionUU { clock } },
};
unsafe {
let mut event: wasi::Event = mem::zeroed();
let res = wasi::poll_oneoff(&in_, &mut event, 1);
match (res, event) {
(
Ok(1),
wasi::Event {
userdata: USERDATA,
error: wasi::ERRNO_SUCCESS,
type_: wasi::EVENTTYPE_CLOCK,
..
},
) => {}
_ => panic!("thread::sleep(): unexpected result of poll_oneoff"),
}
}
}
pub fn join(self) {
self.0
}
}
pub fn available_parallelism() -> io::Result<NonZeroUsize> {
unsupported()
}
pub mod guard {
pub type Guard = !;
pub unsafe fn current() -> Option<Guard> {
None
}
pub unsafe fn init() -> Option<Guard> {
None
}
}
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