sched_getcpu

Section: C Library Functions (3)
Updated: 2022-12-15
Index Return to Main Contents
 

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).
 

VERSIONS

This function is available since glibc 2.6.  

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
sched_getcpu() Thread safetyMT-Safe

 

STANDARDS

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)

 

Index

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
VERSIONS
ATTRIBUTES
STANDARDS
NOTES
SEE ALSO
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