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use crate::num::NonZero;
use crate::time::Duration;
use crate::{io, ptr};
pub type Tid = hermit_abi::Tid;
pub struct Thread {
tid: Tid,
}
unsafe impl Send for Thread {}
unsafe impl Sync for Thread {}
pub const DEFAULT_MIN_STACK_SIZE: usize = 1 << 20;
impl Thread {
pub unsafe fn new_with_coreid(
stack: usize,
p: Box<dyn FnOnce()>,
core_id: isize,
) -> io::Result<Thread> {
let p = Box::into_raw(Box::new(p));
let tid = unsafe {
hermit_abi::spawn2(
thread_start,
p.expose_provenance(),
hermit_abi::Priority::into(hermit_abi::NORMAL_PRIO),
stack,
core_id,
)
};
return if tid == 0 {
// The thread failed to start and as a result p was not consumed. Therefore, it is
// safe to reconstruct the box so that it gets deallocated.
unsafe {
drop(Box::from_raw(p));
}
Err(io::const_error!(io::ErrorKind::Uncategorized, "unable to create thread!"))
} else {
Ok(Thread { tid })
};
extern "C" fn thread_start(main: usize) {
unsafe {
// Finally, let's run some code.
Box::from_raw(ptr::with_exposed_provenance::<Box<dyn FnOnce()>>(main).cast_mut())();
// run all destructors
crate::sys::thread_local::destructors::run();
crate::rt::thread_cleanup();
}
}
}
pub unsafe fn new(
stack: usize,
_name: Option<&str>,
p: Box<dyn FnOnce()>,
) -> io::Result<Thread> {
unsafe {
Thread::new_with_coreid(stack, p, -1 /* = no specific core */)
}
}
pub fn join(self) {
unsafe {
let _ = hermit_abi::join(self.tid);
}
}
}
pub fn available_parallelism() -> io::Result<NonZero<usize>> {
unsafe { Ok(NonZero::new_unchecked(hermit_abi::available_parallelism())) }
}
#[inline]
pub fn sleep(dur: Duration) {
let micros = dur.as_micros() + if dur.subsec_nanos() % 1_000 > 0 { 1 } else { 0 };
let micros = u64::try_from(micros).unwrap_or(u64::MAX);
unsafe {
hermit_abi::usleep(micros);
}
}
#[inline]
pub fn yield_now() {
unsafe {
hermit_abi::yield_now();
}
}
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