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use crate::ffi::CStr;
use crate::io;
use crate::num::NonZero;
use crate::sys::unsupported;
use crate::time::{Duration, Instant};
pub struct Thread(!);
pub const DEFAULT_MIN_STACK_SIZE: usize = 1024 * 1024;
impl Thread {
// unsafe: see thread::Builder::spawn_unchecked for safety requirements
pub unsafe fn new(
_stack: usize,
_name: Option<&str>,
_p: Box<dyn FnOnce()>,
) -> io::Result<Thread> {
unsupported()
}
pub fn yield_now() {}
pub fn set_name(_name: &CStr) {}
pub fn sleep(dur: Duration) {
#[cfg(target_arch = "wasm32")]
use core::arch::wasm32 as wasm;
#[cfg(target_arch = "wasm64")]
use core::arch::wasm64 as wasm;
use crate::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 as u128, nanos);
let mut x = 0;
let val = unsafe { wasm::memory_atomic_wait32(&mut x, 0, amt as i64) };
debug_assert_eq!(val, 2);
nanos -= amt;
}
}
pub fn sleep_until(deadline: Instant) {
let now = Instant::now();
if let Some(delay) = deadline.checked_duration_since(now) {
Self::sleep(delay);
}
}
pub fn join(self) {}
}
pub(crate) fn current_os_id() -> Option<u64> {
None
}
pub fn available_parallelism() -> io::Result<NonZero<usize>> {
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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