sourceturner
112 lines
3.3 KiB
Rust
112 lines
3.3 KiB
Rust
//! `semaphore.h` implementation.
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//!
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//! See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/semaphore.h.html>.
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use crate::{
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header::time::{CLOCK_MONOTONIC, CLOCK_REALTIME, timespec},
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platform::types::{c_char, c_int, c_long, c_uint, clockid_t},
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};
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/semaphore.h.html>.
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// TODO: Statically verify size and align
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#[repr(C)]
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#[derive(Clone, Copy)]
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pub union sem_t {
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pub size: [c_char; 4],
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pub align: c_long,
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}
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pub type RlctSempahore = crate::sync::Semaphore;
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/sem_close.html>.
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// #[unsafe(no_mangle)]
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pub unsafe extern "C" fn sem_close(sem: *mut sem_t) -> c_int {
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todo!("named semaphores")
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}
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/sem_destroy.html>.
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn sem_destroy(sem: *mut sem_t) -> c_int {
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unsafe { core::ptr::drop_in_place(sem.cast::<RlctSempahore>()) };
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0
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}
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/sem_getvalue.html>.
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn sem_getvalue(sem: *mut sem_t, sval: *mut c_int) -> c_int {
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unsafe { sval.write(get(sem).value() as c_int) };
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0
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}
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/sem_init.html>.
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn sem_init(sem: *mut sem_t, _pshared: c_int, value: c_uint) -> c_int {
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unsafe { sem.cast::<RlctSempahore>().write(RlctSempahore::new(value)) };
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0
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}
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/sem_open.html>.
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// TODO: va_list
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// #[unsafe(no_mangle)]
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pub unsafe extern "C" fn sem_open(
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name: *const c_char,
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oflag: c_int, /* (va_list) value: c_uint */
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) -> *mut sem_t {
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todo!("named semaphores")
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}
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/sem_post.html>.
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn sem_post(sem: *mut sem_t) -> c_int {
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unsafe { get(sem) }.post(1);
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0
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}
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/sem_trywait.html>.
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn sem_trywait(sem: *mut sem_t) -> c_int {
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unsafe { get(sem) }.try_wait();
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0
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}
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/sem_unlink.html>.
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// #[unsafe(no_mangle)]
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pub unsafe extern "C" fn sem_unlink(name: *const c_char) -> c_int {
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todo!("named semaphores")
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}
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/sem_trywait.html>.
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn sem_wait(sem: *mut sem_t) -> c_int {
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unsafe { get(sem) }.wait(None, CLOCK_MONOTONIC);
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0
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}
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/sem_clockwait.html>.
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn sem_clockwait(
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sem: *mut sem_t,
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clock_id: clockid_t,
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abstime: *const timespec,
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) -> c_int {
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unsafe { get(sem) }.wait(Some(&unsafe { *abstime }), clock_id);
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0
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}
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/sem_timedwait.html>.
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn sem_timedwait(sem: *mut sem_t, abstime: *const timespec) -> c_int {
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unsafe { get(sem) }.wait(Some(&unsafe { *abstime }), CLOCK_REALTIME);
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0
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}
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unsafe fn get<'any>(sem: *mut sem_t) -> &'any RlctSempahore {
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unsafe { &*sem.cast() }
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}
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