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use super::unsupported;
use crate::ffi::CStr;
use crate::io;
use crate::num::NonZeroUsize;
use crate::ptr::NonNull;
use crate::time::Duration;
pub struct Thread(!);
pub const DEFAULT_MIN_STACK_SIZE: usize = 4096;
impl Thread {
// unsafe: see thread::Builder::spawn_unchecked for safety requirements
pub unsafe fn new(_stack: usize, _p: Box<dyn FnOnce()>) -> io::Result<Thread> {
unsupported()
}
pub fn yield_now() {
// do nothing
}
pub fn set_name(_name: &CStr) {
// nope
}
pub fn sleep(dur: Duration) {
let boot_services: NonNull<r_efi::efi::BootServices> =
crate::os::uefi::env::boot_services().expect("can't sleep").cast();
let mut dur_ms = dur.as_micros();
// ceil up to the nearest microsecond
if dur.subsec_nanos() % 1000 > 0 {
dur_ms += 1;
}
while dur_ms > 0 {
let ms = crate::cmp::min(dur_ms, usize::MAX as u128);
let _ = unsafe { ((*boot_services.as_ptr()).stall)(ms as usize) };
dur_ms -= ms;
}
}
pub fn join(self) {
self.0
}
}
pub fn available_parallelism() -> io::Result<NonZeroUsize> {
// UEFI is single threaded
Ok(NonZeroUsize::new(1).unwrap())
}
pub mod guard {
pub type Guard = !;
pub unsafe fn current() -> Option<Guard> {
None
}
pub unsafe fn init() -> Option<Guard> {
None
}
}
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