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List:       freedesktop-xorg
Subject:    Re: Missing events sometimes
From:       Olivier Fourdan <fourdan () gmail ! com>
Date:       2011-10-28 13:17:23
Message-ID: CACxMwBiDNSrRvo5uiwBVw=idnxy8LuiohdCU8OaERCF4tjODFw () mail ! gmail ! com
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Hi Peter,

On Fri, Oct 28, 2011 at 12:44 AM, Peter Hutterer
<peter.hutterer@who-t.net> wrote:
[...]
>
> I'm not sure on the actual code but there's a race condition for both - if
> the release event happens before the server receives/processes the
> GrabKey/Pointer request you may drop the event on the floor. This shouldn't
> happen since you should get it delivered based on the passive grab either
> way but there's a chance the client drops it.
> Try swapping the passive grab to sync and see if that avoids it.

Yeap it works, this plus an XAllowEvents(dpy, SyncKeyboard, ev->time)
that nails it!

[...]
>
> put a delay in before XGrabPointer in the client and click fast (so that the
> release happens before the request). this way you can easily verify if it is
> that race condition or something else.

Many thanks!

Cheers,
Olivier
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