NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

SCHED_GETCPU(3)           Linux Programmer's Manual          SCHED_GETCPU(3)

NAME         top

       sched_getcpu - determine CPU on which the calling thread is running

SYNOPSIS         top

       #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         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 and errno is set to indicate the error.

ERRORS         top

       ENOSYS This kernel does not implement getcpu(2).

VERSIONS         top

       This function is available since glibc 2.6.

ATTRIBUTES         top

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

       ┌───────────────┬───────────────┬─────────┐
       │Interface      Attribute     Value   │
       ├───────────────┼───────────────┼─────────┤
       │sched_getcpu() │ Thread safety │ MT-Safe │
       └───────────────┴───────────────┴─────────┘

CONFORMING TO         top

       sched_getcpu() is glibc-specific.

NOTES         top

       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         top

       getcpu(2), sched(7)

COLOPHON         top

       This page is part of release 4.11 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/.

Linux                            2015-03-02                  SCHED_GETCPU(3)

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