bjoernager/rust
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panic when encountering an illegal cpumask

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The 8472 2023-09-18 21:51:34 +02:00
parent b1575cb72e
commit a6d87246f6
1 changed files with 4 additions and 2 deletions
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6
library/std/src/sys/unix/thread.rs
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@ -324,8 +324,10 @@ pub fn available_parallelism() -> io::Result<NonZeroUsize> {
if libc::sched_getaffinity(0, mem::size_of::<libc::cpu_set_t>(), &mut set) == 0 { if libc::sched_getaffinity(0, mem::size_of::<libc::cpu_set_t>(), &mut set) == 0 {
let count = libc::CPU_COUNT(&set) as usize; let count = libc::CPU_COUNT(&set) as usize;
let count = count.min(quota); let count = count.min(quota);
// SAFETY: affinity mask can't be empty and the quota gets clamped to a minimum of 1 // reported to occur on MIPS kernels older than our minimum supported kernel version for those targets
return Ok(NonZeroUsize::new_unchecked(count)); let count = NonZeroUsize::new(count)
.expect("CPU count must be > 0. This may be a bug in sched_getaffinity(); try upgrading the kernel.");
return Ok(count);
} }
} }
} }