#![cfg(any(target_os = "linux", target_os = "android"))]
+use crate::convert::TryInto;
+use crate::ptr::null;
use crate::sync::atomic::AtomicI32;
use crate::time::Duration;
pub fn futex_wait(futex: &AtomicI32, expected: i32, timeout: Option<Duration>) {
- let timespec;
- let timespec_ptr = match timeout {
- Some(timeout) => {
- timespec = libc::timespec {
- tv_sec: timeout.as_secs() as _,
- tv_nsec: timeout.subsec_nanos() as _,
- };
- ×pec as *const libc::timespec
- }
- None => crate::ptr::null(),
- };
+ let timespec = timeout.and_then(|d| {
+ Some(libc::timespec {
+ // Sleep forever if the timeout is longer than fits in a timespec.
+ tv_sec: d.as_secs().try_into().ok()?,
+ // This conversion never truncates, as subsec_nanos is always <1e9.
+ tv_nsec: d.subsec_nanos() as _,
+ })
+ });
unsafe {
libc::syscall(
libc::SYS_futex,
futex as *const AtomicI32,
libc::FUTEX_WAIT | libc::FUTEX_PRIVATE_FLAG,
expected,
- timespec_ptr,
+ timespec.as_ref().map_or(null(), |d| d as *const libc::timespec),
);
}
}