* sysdeps/unix/sysv/linux/bits/sched.h: Likewise. * posix/sched.h: Define CPU_COUNT.
(tests): Add tst-cpucount. * posix/sched_cpucount.c: New file. * posix/tst-cpucount.c: New file. * posix/Versions: Export __sched_cpucount with version GLIBC_2.6.