sched_getcpu

NAME

sched_getcpu - determine CPU on which the calling thread is running

Standard C library (libc, -lc)

#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 */

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

On success, sched_getcpu() returns a nonnegative CPU number. On error, -1 is returned and errno is set to indicate the error.

This function is available since glibc 2.6.

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
sched_getcpu ()	Thread safety	MT-Safe

sched_getcpu() is glibc-specific.

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;