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
       This page is part of release 5.04 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                             2017-09-15                   SCHED_GETCPU(3)