sched_getcpu man page

sched_getcpu — determine CPU on which the calling thread is running


#include <sched.h>

int sched_getcpu(void);

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


Since glibc 2.14:


Before glibc 2.14:

   /* _GNU_SOURCE also suffices */


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.



This kernel does not implement getcpu(2).


This function is available since glibc 2.6.


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.


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;

See Also

getcpu(2), sched(7)


This page is part of release 4.15 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

Referenced By

getcpu(2), procenv(1), pthread_setaffinity_np(3), sched(7), sched_setaffinity(2).

2017-09-15 Linux Programmer's Manual