fix deadlock with xcb_take_socket/return_socket v3

[free-sw/xcb/libxcb] / src / xcbext.h

diff --git a/src/xcbext.h b/src/xcbext.h
index 98b3c93..4e1f2f7 100644 (file)
--- a/src/xcbext.h
+++ b/src/xcbext.h
@@ -66,6 +66,7 @@ unsigned int xcb_send_request(xcb_connection_t *c, int flags, struct iovec *vect
  * callback which XCB can call when it wants the write side of the
  * socket back to make a request. This callback synchronizes with the
  * external socket owner and flushes any output queues if appropriate.
+ * The callback might be called from different threads at the same time.
  * If you are sending requests which won't cause a reply, please note the
  * comment for xcb_writev which explains some sequence number wrap issues.
  * */