Plan 9 from Bell Labs’s /usr/web/sources/contrib/quanstro/locktest/threadsem/ref.c
#include <u.h> #include <libc.h> #include <thread.h> #include "threadimpl.h" void incref(Ref *r) { _xinc(&r->ref); } long decref(Ref *r) { return _xdec(&r->ref); }