d65a7ed250
xcb_flush() flushes xcb's output buffer. Thus, after this call, all previous requests are surely written to the connection with the X11 server. xcb_aux_sync() synchronises with the X11 server. It makes sure all previous requests were sent to the X11 server and already processed. It does this via free(xcb_get_input_focus_reply(xcb_get_input_focus())): It sends a request and waits for its reply. It is guaranteed that the X11 server processes requests in-order. This means that the sequence xcb_flush(); xcb_aux_sync() first writes whatever is in the output buffer and then does another write for the four bytes of the GetInputFocus request from xcb_aux_sync(). Put differently: xcb_flush(); xcb_aux_sync() doesn't do anything more than just xcb_aux_sync(). In fact, it has slightly more overhead for the same result. Thus, this commit drops all calls to xcb_flush() immediately after xcb_aux_sync(). Signed-off-by: Uli Schlachter <psychon@znc.in> |
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