sched_getcpu

(3)

determine CPU on which the calling thread is running

#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 */

LIBRARY

Standard C library (libc, -lc)

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;