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// Only used on NetBSD. If other platforms start using id-based parking, use
// separate modules for each platform.
#![cfg(target_os = "netbsd")]
use libc::{_lwp_self, CLOCK_MONOTONIC, c_long, clockid_t, lwpid_t, time_t, timespec};
use crate::ffi::{c_int, c_void};
use crate::ptr;
use crate::time::Duration;
unsafe extern "C" {
fn ___lwp_park60(
clock_id: clockid_t,
flags: c_int,
ts: *mut timespec,
unpark: lwpid_t,
hint: *const c_void,
unparkhint: *const c_void,
) -> c_int;
fn _lwp_unpark(lwp: lwpid_t, hint: *const c_void) -> c_int;
}
pub type ThreadId = lwpid_t;
#[inline]
pub fn current() -> ThreadId {
unsafe { _lwp_self() }
}
#[inline]
pub fn park(hint: usize) {
unsafe {
___lwp_park60(0, 0, ptr::null_mut(), 0, ptr::without_provenance(hint), ptr::null());
}
}
pub fn park_timeout(dur: Duration, hint: usize) {
let mut timeout = timespec {
// Saturate so that the operation will definitely time out
// (even if it is after the heat death of the universe).
tv_sec: dur.as_secs().try_into().ok().unwrap_or(time_t::MAX),
tv_nsec: dur.subsec_nanos() as c_long,
};
// Timeout needs to be mutable since it is modified on NetBSD 9.0 and
// above.
unsafe {
___lwp_park60(
CLOCK_MONOTONIC,
0,
&mut timeout,
0,
ptr::without_provenance(hint),
ptr::null(),
);
}
}
#[inline]
pub fn unpark(tid: ThreadId, hint: usize) {
unsafe {
_lwp_unpark(tid, ptr::without_provenance(hint));
}
}
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