man sched_getcpu (3): 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;

COLOPHON

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