NAME

       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

           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)

COLOPHON

       This  page  is  part of release 5.13 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/.