| use crate::cmp; |
| use crate::time::Duration; |
| |
| 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 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; |
| } |
| } |
