[fpc-pascal] Timer in X11

[Henry Vermaak]

On 21/12/11 12:36, Mark Morgan Lloyd wrote:
> Henry Vermaak wrote:
>> On 21/12/11 11:06, Felipe Monteiro de Carvalho wrote:
>>> Hello,
>>>
>>> Does anyone know what would be the solution for implementing timer
>>> support in a X11 toolkit? I already have TTimer support implemented
>>> for LCL-CustomDrawn-Windows, Cocoa and Android (but Android is the
>>> best tested of them), but it looks like X11 has no support for timers,
>>> so I wonder what the best approach would be to solve this.
>>
>> Roll your own event loop by calling select() on the XConnectionNumber
>> (which is a file descriptor). You can then use the select() timeout,
>> or use timerfd* functions under linux. Google around to find examples.
>
> Presumably with the usual health warnings on whether select() updates
> its parameters. As far as I could tell when hacking serial.pp, Linux
> does but Solaris (8, 10) doesn't.

Indeed.  It seems like relying on this is not a good idea.  So then 
using timer_create with pselect is probably the most portable approach.

Henry