SCHED_GETCPU

Section: Linux Programmer's Manual (3)
Updated: 2014-05-10
Index Return to Main Contents
 

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

 

Multithreading (see pthreads(7))

The sched_getcpu() function is thread-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)  

COLOPHON

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Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
VERSIONS
ATTRIBUTES
Multithreading (see pthreads(7))
CONFORMING TO
NOTES
SEE ALSO
COLOPHON