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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

This page is part of release 3.78 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.

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