sched_getcpu(3)            Library Functions Manual            sched_getcpu(3)

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)

Linux man-pages 6.7               2024-01-01                   sched_getcpu(3)