gdb/gdbserver/

gdb/gdbserver/
2012-12-15  Yao Qi  <yao@codesourcery.com>

	* Makefile.in (OBS): Add notif.o.
	* notif.c, notif.h: New.
	* server.c: Include "notif.h".
	(struct vstop_notif) <next>: Remove.
	<base>: New field.
	(queue_stop_reply): Update.
	(push_event, send_next_stop_reply): Remove.
	(discard_queued_stop_replies): Update.
	(notif_stop): New variable.
	(handle_v_stopped): Remove.
	(handle_v_requests): Don't call handle_v_stopped.  Call
	handle_ack_notif instead.
	(queue_stop_reply_callback): Call notif_event_enque instead
	of queue_stop_reply.
	(handle_status): Don't call send_next_stop_reply, call
	notif_write_event instead.
	(kill_inferior_callback): Likewise.
	(detach_or_kill_inferior_callback): Likewise.
	(main): Call initialize_notif.
	(process_serial_event): Call QUEUE_is_empty.
	(handle_target_event): Call notif_push instead of push event.
	* server.h (push_event): Remove declaration.