sched_getcpu — 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;
See Also
Colophon
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Referenced By
getcpu(2), procenv(1), pthread_setaffinity_np(3), sched(7), sched_setaffinity(2).