server: Add RedClient

That means RedClient tracks a ring of channels. Right now there will be only
a single client because of the disconnection mechanism - whenever a new
client comes we disconnect all existing clients. But this patch adds already
a ring of clients to reds.c (stored in RedServer).

There is a known problem handling many connections and disconnections at the
same time, trigerrable easily by the following script:

export NEW_DISPLAY=:3.0

Xephyr $NEW_DISPLAY -noreset &
for ((i = 0 ; i < 5; ++i)); do
    for ((j = 0 ; j < 10; ++j)); do
        DISPLAY=$NEW_DISPLAY c_win7x86_qxl_tests &
    done
    sleep 2;
done

I fixed a few of the problems resulting from this in the same patch. This
required already introducing a few other changes:
 * make sure all removal of channels happens in the main thread, for that
 two additional dispatcher calls are added to remove a specific channel
 client (RED_WORKER_MESSAGE_CURSOR_DISCONNECT_CLIENT and
 RED_WORKER_MESSAGE_DISPLAY_DISCONNECT_CLIENT).
 * change some asserts in input channel.
 * make main channel disconnect not recursive
 * introduce disconnect call back to red_channel_create_parser

The remaining abort is from a double free in the main channel, still can't
find it (doesn't happen when running under valgrind - probably due to the
slowness resulting from that), but is easy to see when running under gdb.

1 files changed, 7 insertions, 1 deletions

diff --git a/server/red_dispatcher.h b/server/red_dispatcher.h
index fa347f19..07a95aec 100644
--- a/server/red_dispatcher.h
+++ b/server/red_dispatcher.h
@@ -18,6 +18,8 @@
 #ifndef _H_RED_DISPATCHER
 #define _H_RED_DISPATCHER
 
+struct RedChannelClient;
+
 struct RedDispatcher *red_dispatcher_init(QXLInstance *qxl);
 
 void red_dispatcher_set_mm_time(uint32_t);
@@ -30,5 +32,9 @@ uint32_t red_dispatcher_qxl_ram_size(void);
 int red_dispatcher_qxl_count(void);
 void red_dispatcher_async_complete(struct RedDispatcher*, uint64_t);
 
-#endif
+void red_dispatcher_disconnect_display_client(struct RedDispatcher *dispatcher,
+                                      struct RedChannelClient *rcc);
+void red_dispatcher_disconnect_cursor_client(struct RedDispatcher *dispatcher,
+                                      struct RedChannelClient *rcc);
 
+#endif