Attachment 117908 Details for Bug 91750 – wayland multi-threads interface bug

wayland multi-threads interface bug

wayland multi-threads bug.xls (text/plain), 36.00 KB, created by Yujie Shen on 2015-08-25 07:01:07 UTC

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Creator: Yujie Shen

Created: 2015-08-25 07:01:07 UTC

Size: 36.00 KB

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obsolete

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Æsh¬Æ9¬#ü?A;Sð¾à»ÕðÀsÃË>ü  l=Wayland may have interface bug when multi-threads programing.sBriefly,a wl_proxy's property is still being modifying in a thread,while another thread may have sent it to server.Designed sequences map:Error Case:~wl_display_sync,wl_surface_frame,wl_display_get_registry,wl_registry_bind or other interfaces with callback have the same bug.&	Related code in Wayland master branch:
WL_EXPORT int0wl_display_roundtrip(struct wl_display *display){Dreturn wl_display_roundtrip_queue(display, &display->default_queue);}Twl_display_roundtrip_queue(struct wl_display *display, struct wl_event_queue *queue)struct wl_callback *callback;int done, ret = 0;	done = 0;$callback = wl_display_sync(display);if (callback == NULL)
>return -1;8wl_proxy_set_queue((struct wl_proxy *) callback, queue);:wl_callback_add_listener(callback, &sync_listener, &done);while (!done && ret >= 0)0ret = wl_display_dispatch_queue(display, queue);if (ret == -1 && !done)wl_callback_destroy(callback);return ret;5wl_display_dispatch_queue(struct wl_display *display,  struct wl_event_queue *queue)struct pollfd pfd[2];int ret;$pthread_mutex_lock(&display->mutex);%ret = dispatch_queue(display, queue);if (ret == -1)goto err_unlock;if (ret > 0) {&pthread_mutex_unlock(&display->mutex);=/* We ignore EPIPE here, so that we try to read events before= * returning an error.  When the compositor sends an error it> * will close the socket, and if we bail out here we don't get$ * a chance to process the error. *//ret = wl_connection_flush(display->connection);3if (ret < 0 && errno != EAGAIN && errno != EPIPE) {$display_fatal_error(display, errno);display->reader_count++;pfd[0].fd = display->fd;pfd[0].events = POLLIN;do {ret = poll(pfd, 1, -1);&} while (ret == -1 && errno == EINTR);if (ret == -1) { wl_display_cancel_read(display);if (read_events(display) == -1) err_unlock:)Here is our solution for wl_display_sync.|The key of the solution,which shown as red front bellow, is placing "add_listener" and "set_queue" insite the display->lock.nwl_surface_frame,wl_display_get_registry,wl_registry_bind or other interfaces with callback have the same bug.*And they can be solved in the similar way."solution code for wl_display_sync:struct wl_proxy *Awl_custom_proxy_marshal_array_constructor(struct wl_proxy *proxy,<                   uint32_t opcode, union wl_argument *args,8                   const struct wl_interface *interface,-                   void* listener, void *data3                   ,struct wl_event_queue * pQueue)    struct wl_closure *closure;&    struct wl_proxy *new_proxy = NULL;%    const struct wl_message *message;/    pthread_mutex_lock(&proxy->display->mutex);8    message = &proxy->object.interface->methods[opcode];    if (interface) {9        new_proxy = create_outgoing_proxy(proxy, message,+                          args, interface);        if (new_proxy == NULL)            goto err_unlock;H    closure = wl_closure_marshal(&proxy->object, opcode, args, message);    if (closure == NULL) {2        wl_log("Error marshalling request: %m\n");        abort();    }    if (debug_client)8        wl_closure_print(closure, &proxy->object, true);   '	    // add listener before send request    if(listener){\        wl_proxy_add_listener((struct wl_proxy *)new_proxy, (void (**)(void))listener,data);A        wl_proxy_set_queue((struct wl_proxy *)new_proxy, pQueue);?    if (wl_closure_send(closure, proxy->display->connection)) {.        wl_log("Error sending request: %m\n");     wl_closure_destroy(closure); err_unlock:1    pthread_mutex_unlock(&proxy->display->mutex);    return new_proxy;WL_EXPORT voidfwl_custom_proxy_marshal_prepare_args(union wl_argument* args, struct wl_proxy *proxy, uint32_t opcode,;                 const struct wl_interface *interface, ...)
    if(args){        va_list ap;         va_start(ap, interface);T        wl_argument_from_va_list(proxy->object.interface->methods[opcode].signature,0                 args, WL_CLOSURE_MAX_ARGS, ap);        va_end(ap);struct wl_callback *wl_custom_<display_sync(struct wl_display *wl_display,const struct wl_callback_listener *listener, void *data ,struct wl_event_queue * pQueue)=    struct wl_proxy *proxy  =  (struct wl_proxy *)wl_display;B    const struct wl_interface *interface = &wl_callback_interface;'    uint32_t opcode =  WL_DISPLAY_SYNC;0    union wl_argument args[WL_CLOSURE_MAX_ARGS];M    wl_custom_proxy_marshal_prepare_args(args,proxy,opcode, interface, NULL);    return (struct wl_callback *)wl_custom_proxy_marshal_array_constructor(proxy, opcode, args, interface, (void (**)(void))listener,data, pQueue);    ÿ
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