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#![cfg(any(
target_os = "linux",
target_os = "android",
all(target_os = "emscripten", target_feature = "atomics")
))]
#[cfg(any(target_os = "linux", target_os = "android"))]
use crate::convert::TryInto;
#[cfg(any(target_os = "linux", target_os = "android"))]
use crate::ptr::null;
use crate::sync::atomic::AtomicI32;
use crate::time::Duration;
#[cfg(any(target_os = "linux", target_os = "android"))]
pub fn futex_wait(futex: &AtomicI32, expected: i32, timeout: Option<Duration>) {
let timespec = timeout.and_then(|d| {
Some(libc::timespec {
tv_sec: d.as_secs().try_into().ok()?,
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.as_ref().map_or(null(), |d| d as *const libc::timespec),
);
}
}
#[cfg(target_os = "emscripten")]
pub fn futex_wait(futex: &AtomicI32, expected: i32, timeout: Option<Duration>) {
extern "C" {
fn emscripten_futex_wait(
addr: *const AtomicI32,
val: libc::c_uint,
max_wait_ms: libc::c_double,
) -> libc::c_int;
}
unsafe {
emscripten_futex_wait(
futex as *const AtomicI32,
expected as libc::c_uint,
timeout.map_or(crate::f64::INFINITY, |d| d.as_secs_f64() * 1000.0),
);
}
}
#[cfg(any(target_os = "linux", target_os = "android"))]
pub fn futex_wake(futex: &AtomicI32) {
unsafe {
libc::syscall(
libc::SYS_futex,
futex as *const AtomicI32,
libc::FUTEX_WAKE | libc::FUTEX_PRIVATE_FLAG,
1,
);
}
}
#[cfg(target_os = "emscripten")]
pub fn futex_wake(futex: &AtomicI32) {
extern "C" {
fn emscripten_futex_wake(addr: *const AtomicI32, count: libc::c_int) -> libc::c_int;
}
unsafe {
emscripten_futex_wake(futex as *const AtomicI32, 1);
}
}