XCB 函数从客户端队列中丢弃事件（等效于 XSync(..., True)）

Question

在 Xlib 中，有 XSync，据我了解，如果 discard 参数为 True.

XCB中是否有对应的功能？

我发现 xcb_aux_sync mentioned as such an equivalent, but I'm not sure how accurate this is and whether it applies to all events: Its definition seems to corroborate that it's "equivalent to calling XGetInputFocus() and throwing away the reply" as mentioned in the previous source, but XGetInputFocus's manpage 只提到丢弃 keyboard 事件，而不是整个队列中的所有事件。

Answer 1

discard all events currently in the client's event queue

您可以向 libxcb 询问下一个排队的事件，然后将其删除。循环重复，直到队列为空。

xcb_generic_event_t *event;
do {
  event = xcb_poll_for_queued_event(c);
  free(event);
} while (event != NULL);

我不确定 XSync 到底在做什么，但以上至少应该回答了你问题的这一部分。

XCB 函数从客户端队列中丢弃事件（等效于 XSync(..., True)）

XCB function to discard events from client queue (XSync(..., True) equivalent)

c

x11

xlib

xorg

xcb