[Xcb] Asking for help with xcb_wait_for_event function.

[Vincent Torri]

On Fri, 11 Mar 2011, Peter Harris wrote:

> On 2011-03-11 00:37, John Found wrote:
>> So, the question is: How to make xcb_wait_for_event to not remove the event from
>> the event queue, but symply to wait until event apears in the queue?
>
> You don't.
>
> There are a few different possible approaches here. Three of the more
> obvious include:
>
> - Write wrappers for wait/poll. Keep your own queue, and write an unget
> function to put your event back in your own queue (this is how "ungetc"
> works; <stdio> doesn't actually push any characters back to the OS), or
> a wait_only type function.

we can also add such function to the xcb API

Vincent

>
> - Use xcb_get_file_descriptor and select() on it instead of wait_for_ing
> on the xcb connection. This has the disadvantage that select() doesn't
> know about events already in the xcb queue, and (especially if you have
> multiple threads) you might wind up waiting when you didn't need to.
>
> - Since your native language isn't C, you can write your own libxasmb
> that works exactly the way you want it to. XCB was designed to make this
> easy (or, at least, far easier than it was in the Xlib days) by
> providing an XML description of the X protocol. "Easy" is relative; this
> is by far the hardest option of the three.
>
> Peter Harris
> --
>               Open Text Connectivity Solutions Group
> Peter Harris                    http://connectivity.opentext.com/
> Research and Development        Phone: +1 905 762 6001
> pharris at opentext.com            Toll Free: 1 877 359 4866
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