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std::thread::available_parallelism() vxworks libc symbol usage. #147870

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Oct 20, 2025
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std::thread::available_parallelism() vxworks libc symbol usage. #147870

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5 changes: 1 addition & 4 deletions library/std/src/sys/thread/unix.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -314,13 +314,10 @@ pub fn available_parallelism() -> io::Result<NonZero<usize>> {
target_os = "vxworks" => {
// Note: there is also `vxCpuConfiguredGet`, closer to _SC_NPROCESSORS_CONF
// expectations than the actual cores availability.
unsafe extern "C" {
fn vxCpuEnabledGet() -> libc::cpuset_t;
}

// SAFETY: `vxCpuEnabledGet` always fetches a mask with at least one bit set
unsafe{
let set = vxCpuEnabledGet();
let set = libc::vxCpuEnabledGet();
Ok(NonZero::new_unchecked(set.count_ones() as usize))
}
}
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