sched_getcpu (3)

#include <sched.h>

int sched_getcpu(void);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

sched_getcpu():

Since glibc 2.14:

_GNU_SOURCE

Before glibc 2.14:

_BSD_SOURCE || _SVID_SOURCE

    /* _GNU_SOURCE also suffices */

sched_getcpu() returns the number of the CPU on which the calling thread is currently executing.

On success, sched_getcpu() returns a nonnegative CPU number. On error, -1 is returned and errno is set to indicate the error.

ENOSYS

This kernel does not implement getcpu(2).

This function is available since glibc 2.6.

Multithreading (see pthreads(7))

The sched_getcpu() function is thread-safe.

sched_getcpu() is glibc-specific.

The call

cpu = sched_getcpu();

is equivalent to the following getcpu(2) call:

int c, s;
s = getcpu(&c, NULL, NULL);
cpu = (s == -1) ? s : c;

getcpu(2), sched(7)

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