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

NAME
       schedgetcpu - determine CPU on which the calling thread is running

SYNOPSIS
       #include 

       int schedgetcpu(void);

   Feature Test Macro Requirements for glibc (see featuretestmacros(7)):

       schedgetcpu():
           Since glibc 2.14:
               GNUSOURCE
           Before glibc 2.14:
               BSDSOURCE || SVIDSOURCE
                   /* GNUSOURCE also suffices */

DESCRIPTION
       schedgetcpu()  returns  the  number  of  the  CPU on which the calling
       thread is currently executing.

RETURN VALUE
       On success, schedgetcpu() 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   │
       ├───────────────┼───────────────┼─────────┤
       │schedgetcpu() │ Thread safety │ MT-Safe │
       └───────────────┴───────────────┴─────────┘
CONFORMING TO
       schedgetcpu() is glibc specific.

NOTES
       The call

           cpu = schedgetcpu();

       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)

COLOPHON
       This page is part of release 3.53 of the Linux  man-pages  project.   A
       description  of  the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.



Linux                             2013-04-17                   SCHEDGETCPU(3)