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Make `std::thread::available_concurrency` support process-limited number of CPUs...
source link: https://github.com/rust-lang/rust/pull/89310
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Use libc::sched_getaffinity and count the number of CPUs in the returned mask. This handles cases where the process doesn't have access to all CPUs, such as when limited via taskset or similar.
This also covers cgroup cpusets.
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