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

sched_getcpu - 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)):
Since glibc 2.14:
Before glibc 2.14:
/* _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 kernel does not implement getcpu(2).

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;

getcpu(2), sched(7)
2017-09-15 Linux