NAME¶

sched_getcpu - determine CPU on which the calling thread is running

LIBRARY¶

Standard C library (libc, -lc)

SYNOPSIS¶

#include <sched.h>

int sched_getcpu(void);

sched_getcpu():

    Since glibc 2.14:


        _GNU_SOURCE


    Before glibc 2.14:


        _BSD_SOURCE || _SVID_SOURCE


            /* _GNU_SOURCE also suffices */

DESCRIPTION¶

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

RETURN VALUE¶

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

ERRORS¶

ENOSYS

This kernel does not implement getcpu(2).

ATTRIBUTES¶

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

STANDARDS¶

GNU.

HISTORY¶

glibc 2.6.

NOTES¶

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;

SEE ALSO¶

getcpu(2), sched(7)