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thread::available_parallelism for wasm32-wasip1-threads #133496

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Merged
merged 2 commits into from
Nov 30, 2024
Merged

thread::available_parallelism for wasm32-wasip1-threads #133496

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f0b7008
thread::available_parallelism for wasm32-wasip1-threads
surban Nov 26, 2024
4342ec0
Implement code review
surban Nov 27, 2024
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16 changes: 13 additions & 3 deletions library/std/src/sys/pal/wasi/thread.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,6 @@

use crate::ffi::CStr;
use crate::num::NonZero;
use crate::sys::unsupported;
use crate::time::Duration;
use crate::{io, mem};

Expand Down Expand Up @@ -34,6 +33,8 @@ cfg_if::cfg_if! {
#[allow(non_camel_case_types)]
pub type pthread_t = *mut ffi::c_void;

pub const _SC_NPROCESSORS_ONLN: ffi::c_int = 84;

extern "C" {
pub fn pthread_create(
native: *mut pthread_t,
Expand Down Expand Up @@ -121,7 +122,7 @@ impl Thread {
}
} else {
pub unsafe fn new(_stack: usize, _p: Box<dyn FnOnce()>) -> io::Result<Thread> {
unsupported()
crate::sys::unsupported()
}
}
}
Expand Down Expand Up @@ -187,5 +188,14 @@ impl Thread {
}

pub fn available_parallelism() -> io::Result<NonZero<usize>> {
unsupported()
cfg_if::cfg_if! {
if #[cfg(target_feature = "atomics")] {
match unsafe { libc::sysconf(libc::_SC_NPROCESSORS_ONLN) } {
-1 => Err(io::Error::last_os_error()),
cpus => NonZero::new(cpus as usize).ok_or(io::Error::UNKNOWN_THREAD_COUNT),
}
} else {
crate::sys::unsupported()
}
}
}
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