Make xcb_take_socket keep flushing until idle

_xcb_out_flush_to will drop the iolock in pthread_cond_wait allowing
other threads to queue new requests. When this happened,
there would be requests queued for the socket after _xcb_out_flush_to
returned, and xcb_take_socket would throw an assert.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=29875
Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Julien Danjou <julien@danjou.info>

1 files changed, 7 insertions, 1 deletions

diff --git a/src/xcb_out.c b/src/xcb_out.c
index 5eb1e42..d6082fc 100644
--- a/src/xcb_out.c
+++ b/src/xcb_out.c
@@ -263,7 +263,13 @@ int xcb_take_socket(xcb_connection_t *c, void (*return_socket)(void *closure), v
         return 0;
     pthread_mutex_lock(&c->iolock);
     get_socket_back(c);
-    ret = _xcb_out_flush_to(c, c->out.request);
+
+    /* _xcb_out_flush may drop the iolock allowing other threads to
+     * write requests, so keep flushing until we're done
+     */
+    do
+	    ret = _xcb_out_flush_to(c, c->out.request);
+    while (ret && c->out.request != c->out.request_written);
     if(ret)
     {
         c->out.return_socket = return_socket;