[PATCH 1/6] Move notif_queue to remote_state

[Yao Qi <yao@codesourcery.com>]

This patch is to move global 'notif_queue' to 'struct remote_state', as
a follow up to Tom's patch series '[PATCH 00/16] clean up remote.c state'
<http://sourceware.org/ml/gdb-patches/2013-06/msg00605.html>

gdb:

	* remote-notif.c (DECLARE_QUEUE_P): Remove.
	(notif_queue): Remove.
	(remote_notif_process): Add one parameter 'notif_queue'.
	Update comments.  Callers update.
	(remote_notif_register_async_event_handler): Add parameter
	'notif_queue'.  Pass 'notif_queue' to
	create_async_event_handler.
	(handle_notification): Add parameter 'notif_queue'.  Update
	comments.  Callers update.
	(remote_notif_state): New function.
	(_initialize_notif): Remove code to allocate queue.
	* remote-notif.h (DECLARE_QUEUE_P): Moved from remote-notif.c.
	(struct remote_notif_state): New.
	(handle_notification): Update declaration.
	(remote_notif_register_async_event_handler): Likewise.
	(remote_notif_process): Likewise.
	(remote_notif_state): Declare.
	* remote.c (struct remote_state) <notif_state>: New field.
	(remote_open_1): Initialize rs->notif_state and pass it to
	remote_notif_register_async_event_handler.
---
 gdb/remote-notif.c |   40 ++++++++++++++++++++++++----------------
 gdb/remote-notif.h |   20 +++++++++++++++++---
 gdb/remote.c       |   12 ++++++++----
 3 files changed, 49 insertions(+), 23 deletions(-)

diff --git a/gdb/remote-notif.c b/gdb/remote-notif.c
index c4bfd8d..8b69f2f 100644
--- a/gdb/remote-notif.c
+++ b/gdb/remote-notif.c
@@ -91,21 +91,19 @@ remote_notif_parse (struct notif_client *nc, char *buf)
   return event;
 }
 
-DECLARE_QUEUE_P (notif_client_p);
 DEFINE_QUEUE_P (notif_client_p);
 
-static QUEUE(notif_client_p) *notif_queue;
-
-/* Process notifications one by one.  EXCEPT is not expected in
-   the queue.  */
+/* Process notifications in NOTIF_QUEUE one by one.  EXCEPT is not expected
+   in the queue.  */
 
 void
-remote_notif_process (struct notif_client *except)
+remote_notif_process (struct remote_notif_state *state,
+		      struct notif_client *except)
 {
-  while (!QUEUE_is_empty (notif_client_p, notif_queue))
+  while (!QUEUE_is_empty (notif_client_p, state->notif_queue))
     {
       struct notif_client *nc = QUEUE_deque (notif_client_p,
-					     notif_queue);
+					     state->notif_queue);
 
       gdb_assert (nc != except);
 
@@ -118,7 +116,7 @@ static void
 remote_async_get_pending_events_handler (gdb_client_data data)
 {
   gdb_assert (non_stop);
-  remote_notif_process (NULL);
+  remote_notif_process (data, NULL);
 }
 
 /* Asynchronous signal handle registered as event loop source for when
@@ -131,11 +129,11 @@ static struct async_event_handler *remote_async_get_pending_events_token;
 /* Register async_event_handler for notification.  */
 
 void
-remote_notif_register_async_event_handler (void)
+remote_notif_register_async_event_handler (struct remote_notif_state *state)
 {
   remote_async_get_pending_events_token
     = create_async_event_handler (remote_async_get_pending_events_handler,
-				  NULL);
+				  state);
 }
 
 /* Unregister async_event_handler for notification.  */
@@ -147,10 +145,11 @@ remote_notif_unregister_async_event_handler (void)
     delete_async_event_handler (&remote_async_get_pending_events_token);
 }
 
-/* Remote notification handler.  */
+/* Remote notification handler.  Parse BUF, queue notification and
+   update STATE.  */
 
 void
-handle_notification (char *buf)
+handle_notification (struct remote_notif_state *state, char *buf)
 {
   struct notif_client *nc = NULL;
   int i;
@@ -189,7 +188,7 @@ handle_notification (char *buf)
 
       /* Notify the event loop there's a stop reply to acknowledge
 	 and that there may be more events to fetch.  */
-      QUEUE_enque (notif_client_p, notif_queue, nc);
+      QUEUE_enque (notif_client_p, state->notif_queue, nc);
       if (non_stop)
 	{
 	  /* In non-stop, We mark REMOTE_ASYNC_GET_PENDING_EVENTS_TOKEN
@@ -262,14 +261,23 @@ notif_xfree (struct notif_client *notif)
   xfree (notif);
 }
 
+/* Return an allocated remote_notif_state.  */
+
+struct remote_notif_state *
+remote_notif_state (void)
+{
+  struct remote_notif_state *notif_state = xmalloc (sizeof (*notif_state));
+
+  notif_state->notif_queue = QUEUE_alloc (notif_client_p, notif_xfree);
+  return notif_state;
+}
+
 /* -Wmissing-prototypes */
 extern initialize_file_ftype _initialize_notif;
 
 void
 _initialize_notif (void)
 {
-  notif_queue = QUEUE_alloc (notif_client_p, notif_xfree);
-
   add_setshow_boolean_cmd ("notification", no_class, &notif_debug,
 			   _("\
 Set debugging of async remote notification."), _("\
diff --git a/gdb/remote-notif.h b/gdb/remote-notif.h
index da4fdea..05d2613 100644
--- a/gdb/remote-notif.h
+++ b/gdb/remote-notif.h
@@ -68,16 +68,30 @@ typedef struct notif_client
   struct notif_event *pending_event;
 } *notif_client_p;
 
+DECLARE_QUEUE_P (notif_client_p);
+
+/* State on remote async notification.  */
+
+struct remote_notif_state
+{
+  /* Notification queue.  */
+  QUEUE(notif_client_p) *notif_queue;
+};
+
 void remote_notif_ack (struct notif_client *nc, char *buf);
 struct notif_event *remote_notif_parse (struct notif_client *nc,
 					char *buf);
 
-void handle_notification (char *buf);
+void handle_notification (struct remote_notif_state *notif_state,
+			  char *buf);
 
-void remote_notif_register_async_event_handler (void);
+void remote_notif_register_async_event_handler (struct remote_notif_state *);
 void remote_notif_unregister_async_event_handler (void);
 
-void remote_notif_process (struct notif_client *except);
+void remote_notif_process (struct remote_notif_state *state,
+			   struct notif_client *except);
+struct remote_notif_state *remote_notif_state (void);
+
 extern struct notif_client notif_client_stop;
 
 extern int notif_debug;
diff --git a/gdb/remote.c b/gdb/remote.c
index 5028451..e50623a 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -425,6 +425,9 @@ struct remote_state
   threadref echo_nextthread;
   threadref nextthread;
   threadref resultthreadlist[MAXTHREADLISTRESULTS];
+
+  /* The state of remote notification.  */
+  struct remote_notif_state *notif_state;
 };
 
 /* Private data that we'll store in (struct thread_info)->private.  */
@@ -4337,7 +4340,8 @@ remote_open_1 (char *name, int from_tty,
   remote_async_inferior_event_token
     = create_async_event_handler (remote_async_inferior_event_handler,
 				  NULL);
-  remote_notif_register_async_event_handler ();
+  rs->notif_state = remote_notif_state ();
+  remote_notif_register_async_event_handler (rs->notif_state);
 
   /* Reset the target state; these things will be queried either by
      remote_query_supported or as they are needed.  */
@@ -4931,7 +4935,7 @@ remote_resume (struct target_ops *ops,
      before resuming inferior, because inferior was stopped and no RSP
      traffic at that moment.  */
   if (!non_stop)
-    remote_notif_process (&notif_client_stop);
+    remote_notif_process (rs->notif_state, &notif_client_stop);
 
   rs->last_sent_signal = siggnal;
   rs->last_sent_step = step;
@@ -7395,7 +7399,7 @@ putpkt_binary (char *buf, int cnt)
 					    str);
 			do_cleanups (old_chain);
 		      }
-		    handle_notification (rs->buf);
+		    handle_notification (rs->notif_state, rs->buf);
 		    /* We're in sync now, rewait for the ack.  */
 		    tcount = 0;
 		  }
@@ -7781,7 +7785,7 @@ getpkt_or_notif_sane_1 (char **buf, long *sizeof_buf, int forever,
 	  if (is_notif != NULL)
 	    *is_notif = 1;
 
-	  handle_notification (*buf);
+	  handle_notification (rs->notif_state, *buf);
 
 	  /* Notifications require no acknowledgement.  */
 
-- 
1.7.7.6