add threadnotify

include/thread.h

diff --git a/include/thread.h b/include/thread.h
index 23c4a52..a65ebe7 100644
--- a/include/thread.h
+++ b/include/thread.h
@@ -24,6 +24,11 @@
 #define	yield		threadyield
 
 /*
+ * signals
+ */
+void		threadnotify(int(*f)(void*,char*), int);
+
+/*
  * daemonize
  *
 void	threaddaemonize(void);