sched_getcpu(3) Library Functions Manual sched_getcpu(3)
NAME
sched_getcpu - determine CPU on which the calling thread is running
LIBRARY
Standard C library (libc, -lc)
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).
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
┌────────────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├────────────────────────────────────────────┼───────────────┼─────────┤
│ sched_getcpu() │ Thread safety │ MT-Safe │
└────────────────────────────────────────────┴───────────────┴─────────┘
STANDARDS
GNU.
HISTORY
glibc 2.6.
NOTES
The call
cpu = sched_getcpu();
is equivalent to the following getcpu(2) call:
int c, s;
s = getcpu(&c, NULL);
cpu = (s == -1) ? s : c;
SEE ALSO
getcpu(2), sched(7)
Linux man-pages 6.9.1 2024-05-02 sched_getcpu(3)
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