_SC_THREADS       323 ext/etc/constdefs.h #if !defined(_SC_THREADS)
_SC_THREADS       325 ext/etc/constdefs.h #  define _SC_THREADS _SC_THREADS
_SC_THREADS      1133 ext/etc/constdefs.h #if defined(_SC_THREADS)
_SC_THREADS      1134 ext/etc/constdefs.h     rb_define_const(mod, "SC_THREADS", INTEGER2NUM(_SC_THREADS));