Manpages - sched_getcpu.3

sched_getcpu - determine CPU on which the calling thread is running

  #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 */

*sched_getcpu*() returns the number of the CPU on which the calling thread is currently executing.

On success, *sched_getcpu*() returns a nonnegative CPU number. On error, -1 is returned and errno is set to indicate the error.

ENOSYS

This kernel does not implement *getcpu*(2).

This function is available since glibc 2.6.

For an explanation of the terms used in this section, see *attributes*(7).

*sched_getcpu*() is glibc-specific.

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;

*getcpu*(2), *sched*(7)

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