#define SIG_MEMORY_FAULT SIGSEGV
-#define SIG_INTERRUPT_THREAD (SIGRTMIN)
-#define SIG_STOP_FOR_GC (SIGRTMIN+1)
-#define SIG_RESUME_FROM_GC (SIGRTMIN+2)
+#define SIG_INTERRUPT_THREAD (SIGPWR)
+#define SIG_STOP_FOR_GC (SIGUSR1)
/* Yaargh?! */
typedef int os_context_register_t ;