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sched_getcpu - determine CPU on which the calling thread is running
#define _GNU_SOURCE /* See feature_test_macros(7) */
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.
sched_getcpu() is glibc specific.
cpu = sched_getcpu();
is equivalent to the following getcpu(2) call:
int c, s;
s = getcpu(&c, NULL, NULL);
cpu = (s == -1) ? s : c;
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