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sched_getcpu(3) — Linux manual page

NAME \|LIBRARY \|SYNOPSIS \|DESCRIPTION \|RETURN VALUE \|ERRORS \|ATTRIBUTES \|STANDARDS \|HISTORY \|NOTES \|SEE ALSO \|COLOPHON

sched_getcpu(3)          Library Functions Manualsched_getcpu(3)

NAME top

       sched_getcpu - determine CPU on which the calling thread is       running

LIBRARY top

       Standard C library (libc,-lc)

SYNOPSIS top

#include <sched.h>int sched_getcpu(void);   Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):sched_getcpu():           Since glibc 2.14:               _GNU_SOURCE           Before glibc 2.14:               _BSD_SOURCE || _SVID_SOURCE                   /* _GNU_SOURCE also suffices */

DESCRIPTION top

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

RETURN VALUE top

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

ERRORS top

ENOSYSThis kernel does not implementgetcpu(2).

ATTRIBUTES top

       For an explanation of the terms used in this section, seeattributes(7).       ┌──────────────────────────────────────┬───────────────┬─────────┐       │Interface│Attribute│Value│       ├──────────────────────────────────────┼───────────────┼─────────┤       │sched_getcpu()                       │ Thread safety │ MT-Safe │       └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS top

       GNU.

HISTORY top

       glibc 2.6.

NOTES top

       The call           cpu = sched_getcpu();       is equivalent to the followinggetcpu(2) call:           int c, s;           s = getcpu(&c, NULL);           cpu = (s == -1) ? s : c;

COLOPHON top

       This page is part of theman-pages (Linux kernel and C library       user-space interface documentation) project.  Information about       the project can be found at        ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report       for this manual page, see       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.       This page was obtained from the tarball man-pages-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  If you discover any rendering problems in this HTML       version of the page, or you believe there is a better or more up-       to-date source for the page, or you have corrections or       improvements to the information in this COLOPHON (which isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17sched_getcpu(3)

Pages that refer to this page:getcpu(2), sched_setaffinity(2), pthread_setaffinity_np(3), sched(7)

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