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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