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std:🧵 refine available_parallelism for solaris/illumos.

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Rather than the system-wide available cpus fallback solution, we fetch
the cpus bound to the current process.
This commit is contained in:
David Carlier 2024-03-24 10:57:17 +00:00
parent 548e14b439
commit 4b84df9ea3
1 changed files with 6 additions and 0 deletions
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6
library/std/src/sys/pal/unix/thread.rs
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@ -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`