SCHED_GETCPU

Section: Linux Programmer's Manual (3)
Updated: 2008-07-03
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NAME

sched_getcpu - determine CPU on which the calling thread is running

SYNOPSIS

#define _GNU_SOURCE
#include <utmpx.h>

int sched_getcpu(void);

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

sched_getcpu(): _BSD_SOURCE || _SVID_SOURCE

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 non-negative CPU number. On error, -1 is returned and errno is set to indicate the error.

ERRORS

ENOSYS: This kernel does not implement getcpu(2).

VERSIONS

This function is available since glibc 2.6.

CONFORMING TO

sched_getcpu() is glibc specific.

NOTES

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;

COLOPHON

This page is part of release 3.22 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.