below, with IMMEDIATE_P == 0. */
void mark_async_signal_handler (struct async_signal_handler *handler);
+/* Returns true if HANDLER is marked ready. */
+
+extern int
+ async_signal_handler_is_marked (struct async_signal_handler *handler);
+
+/* Mark HANDLER as NOT ready. */
+
+extern void clear_async_signal_handler (struct async_signal_handler *handler);
+
/* Wrapper for the body of signal handlers. Call this function from
any SIGINT handler which needs to access GDB data structures or
escape via longjmp. If IMMEDIATE_P is set, this triggers either