Sched_getcpu (3) Linux Manual Page

sched_getcpu – determine CPU on which the calling thread is running

Synopsis

#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 */

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).

Versions

This function is available since glibc 2.6.

Attributes

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

`Interface`	`Attribute`	`Value`
`sched_getcpu`()	Thread safety	MT-Safe

Conforming To

sched_getcpu() is glibc-specific.

Notes

The call int c, s;
s = getcpu(&c, NULL, NULL);
cpu = (s == -1) ? s : c; 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 5.10 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

sched_getcpu (3) Linux Manual Page