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SCHED_GETCPU(3) Linux Programmer's Manual SCHED_GETCPU(3)
NAME
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
getcpu(2), sched(7)
Linux 2021-03-22 SCHED_GETCPU(3)