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, 2 insertions, 0 deletions

diff --git a/server/red_worker.h b/server/red_worker.h
index 80cd8c01..6fbe0611 100644
--- a/server/red_worker.h
+++ b/server/red_worker.h
@@ -53,11 +53,13 @@ enum {
     RED_WORKER_MESSAGE_READY,
     RED_WORKER_MESSAGE_DISPLAY_CONNECT,
     RED_WORKER_MESSAGE_DISPLAY_DISCONNECT,
+    RED_WORKER_MESSAGE_DISPLAY_DISCONNECT_CLIENT,
     RED_WORKER_MESSAGE_DISPLAY_MIGRATE,
     RED_WORKER_MESSAGE_START,
     RED_WORKER_MESSAGE_STOP,
     RED_WORKER_MESSAGE_CURSOR_CONNECT,
     RED_WORKER_MESSAGE_CURSOR_DISCONNECT,
+    RED_WORKER_MESSAGE_CURSOR_DISCONNECT_CLIENT,
     RED_WORKER_MESSAGE_CURSOR_MIGRATE,
     RED_WORKER_MESSAGE_SET_COMPRESSION,
     RED_WORKER_MESSAGE_SET_STREAMING_VIDEO,