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Rollup merge of #128026 - devnexen:available_parallelism_vxworks, r=Mark-Simulacrum

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std:🧵 available_parallelism implementation for vxWorks proposal.
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Matthias Krüger 2024-08-05 08:22:21 +02:00 committed by GitHub
commit 02c3837d8b
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1 changed files with 11 additions and 1 deletions
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12
library/std/src/sys/pal/unix/thread.rs
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@ -455,8 +455,18 @@ pub fn available_parallelism() -> io::Result<NonZero<usize>> {
Ok(NonZero::new_unchecked(sinfo.cpu_count as usize)) Ok(NonZero::new_unchecked(sinfo.cpu_count as usize))
} }
} else if #[cfg(target_os = "vxworks")] {
// Note: there is also `vxCpuConfiguredGet`, closer to _SC_NPROCESSORS_CONF
// expectations than the actual cores availability.
extern "C" {
fn vxCpuEnabledGet() -> libc::cpuset_t;
}
// always fetches a valid bitmask
let set = unsafe { vxCpuEnabledGet() };
Ok(NonZero::new_unchecked(set.count_ones() as usize))
} else { } else {
// FIXME: implement on vxWorks, Redox, l4re // FIXME: implement on Redox, l4re
Err(io::const_io_error!(io::ErrorKind::Unsupported, "Getting the number of hardware threads is not supported on the target platform")) Err(io::const_io_error!(io::ErrorKind::Unsupported, "Getting the number of hardware threads is not supported on the target platform"))
} }
} }