diff -ur public.h public.h
--- public.h	Thu Mar 28 21:09:08 2002
+++ public.h	Fri Jan 21 15:14:24 2005
@@ -85,9 +85,12 @@
 typedef struct _st_cond *   st_cond_t;
 typedef struct _st_mutex *  st_mutex_t;
 typedef struct _st_netfd *  st_netfd_t;
+typedef void (*st_switch_cb_t)(void);
 
 extern int st_init(void);
 extern int st_getfdlimit(void);
+extern st_switch_cb_t st_set_switch_in_cb(st_switch_cb_t cb);
+extern st_switch_cb_t st_set_switch_out_cb(st_switch_cb_t cb);
 
 extern st_thread_t st_thread_self(void);
 extern void st_thread_exit(void *retval);