sched_getcpu(3) — determine CPU on which the calling thread is running

sched_getcpu(3)

Library Functions Manual

sched_getcpu(3)

NAME

sched_getcpu - determine CPU on which the calling thread is running

Standard C library (libc, -lc)

#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.

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
sched_getcpu ()	Thread safety	MT-Safe

GNU.

glibc 2.6.

The call

cpu = sched_getcpu();

is equivalent to the following getcpu(2) call:

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