84 lines
2.3 KiB
Rust
84 lines
2.3 KiB
Rust
use crate::ffi::CStr;
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use crate::io;
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use crate::mem;
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use crate::sys_common::thread::start_thread;
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use crate::sys::{cvt, syscall};
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use crate::time::Duration;
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pub const DEFAULT_MIN_STACK_SIZE: usize = 2 * 1024 * 1024;
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pub struct Thread {
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id: usize,
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}
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// Some platforms may have pthread_t as a pointer in which case we still want
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// a thread to be Send/Sync
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unsafe impl Send for Thread {}
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unsafe impl Sync for Thread {}
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impl Thread {
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// unsafe: see thread::Builder::spawn_unchecked for safety requirements
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pub unsafe fn new(_stack: usize, p: Box<dyn FnOnce()>) -> io::Result<Thread> {
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let p = box p;
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let id = cvt(syscall::clone(syscall::CLONE_VM | syscall::CLONE_FS | syscall::CLONE_FILES))?;
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if id == 0 {
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start_thread(&*p as *const _ as *mut _);
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let _ = syscall::exit(0);
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panic!("thread failed to exit");
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} else {
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mem::forget(p);
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Ok(Thread { id })
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}
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}
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pub fn yield_now() {
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let ret = syscall::sched_yield().expect("failed to sched_yield");
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debug_assert_eq!(ret, 0);
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}
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pub fn set_name(_name: &CStr) {
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}
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pub fn sleep(dur: Duration) {
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let mut secs = dur.as_secs();
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let mut nsecs = dur.subsec_nanos() as i32;
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// If we're awoken with a signal then the return value will be -1 and
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// nanosleep will fill in `ts` with the remaining time.
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while secs > 0 || nsecs > 0 {
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let req = syscall::TimeSpec {
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tv_sec: secs as i64,
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tv_nsec: nsecs,
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};
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secs -= req.tv_sec as u64;
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let mut rem = syscall::TimeSpec::default();
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if syscall::nanosleep(&req, &mut rem).is_err() {
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secs += rem.tv_sec as u64;
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nsecs = rem.tv_nsec;
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} else {
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nsecs = 0;
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}
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}
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}
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pub fn join(self) {
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let mut status = 0;
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syscall::waitpid(self.id, &mut status, 0).unwrap();
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}
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pub fn id(&self) -> usize { self.id }
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pub fn into_id(self) -> usize {
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let id = self.id;
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mem::forget(self);
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id
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}
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}
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pub mod guard {
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pub type Guard = !;
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pub unsafe fn current() -> Option<Guard> { None }
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pub unsafe fn init() -> Option<Guard> { None }
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}
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