sched_getaffinity (nr 204)

Linux Signature

int sched_getaffinity(pid_t pid, size_t cpusetsize, cpu_set_t *mask);

Description

Get a thread’s CPU affinity mask.

Current Implementation

Zeroes the user-provided mask buffer, then sets bit 0 (CPU 0 only). Returns cpusetsize (the number of bytes written). ostoo is a single-CPU kernel.

Rust’s standard library calls sched_getaffinity during runtime init to determine available parallelism.

Source: osl/src/syscalls/misc.rs — sys_sched_getaffinity

Errors