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)