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)):
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.
- ENOSYS
- 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)