sched_getcpu(3) — Linux manual page

sched_getcpu(3)         Library Functions Manual         sched_getcpu(3)

NAME

       sched_getcpu - determine CPU on which the calling thread is
       running

LIBRARY

       Standard C library (libc, -lc)

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).

ATTRIBUTES

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

STANDARDS

       GNU.

HISTORY

       glibc 2.6.

NOTES

       The call

           cpu = sched_getcpu();

       is equivalent to the following getcpu(2) call:

           int c, s;
           s = getcpu(&c, NULL);
           cpu = (s == -1) ? s : c;

SEE ALSO

       getcpu(2), sched(7)

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Linux man-pages 6.9.1          2024-05-02                sched_getcpu(3)

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

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