sched_getcpu

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

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
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       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                             2017-09-15                   SCHED_GETCPU(3)
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