[fpc-pascal] Timer in X11

[Henry Vermaak]

On 21/12/11 11:53, 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.

Also note that when doing this, you'll have to make sure you check for 
all the internal connections that X opens/closes.  You can do this with 
XAddConnectionWatch().  The callback will give you a file descriptor 
that you can add/remove to/from the set of file descriptors you a 
monitoring with select().

Henry