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std::thread: refine available_parallelism for solaris/illumos. #122992

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Mar 24, 2024
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std::thread: refine available_parallelism for solaris/illumos. #122992

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4b84df9
std::thread: refine available_parallelism for solaris/illumos.
devnexen Mar 24, 2024
1871ea5
fix build.
devnexen Mar 24, 2024
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6 changes: 6 additions & 0 deletions library/std/src/sys/pal/unix/thread.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -483,6 +483,12 @@ pub fn available_parallelism() -> io::Result<NonZero<usize>> {
.ok_or(io::const_io_error!(io::ErrorKind::NotFound, "The number of hardware threads is not known for the target platform"))
}
}
} else if #[cfg(any(target_os = "solaris", target_os = "illumos"))] {
let mut cpus = 0u32;
if unsafe { libc::pset_info(libc::PS_MYID, core::ptr::null_mut(), &mut cpus, core::ptr::null_mut()) } == 0 {
NonZero::new(cpus as usize)
.ok_or(io::const_io_error!(io::ErrorKind::NotFound, "The number of hardware threads is not known for the target platform"))
}
} else if #[cfg(target_os = "haiku")] {
// system_info cpu_count field gets the static data set at boot time with `smp_set_num_cpus`
// `get_system_info` calls then `smp_get_num_cpus`
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