Why does sched_getaffinity (or sched_setaffinity) return an error on Red Hat Enterprise Linux 6 x86_64?

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The Linux system calls sched_getaffinity() and sched_setaffinity() may return an EINVAL (invalid argument) error on x86_64 systems running Red Hat Enterprise Linux 6.  For example, consider the following code snippet:

cpu_set_t mask;

if ( sched_getaffinity(0, sizeof(mask), &mask) == -1 )

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