# To subscribers of the xforms list from firstname.lastname@example.org (Steve Lamont) :
> It seems as if the timer callbacks are disabled when my main program calls
> sleep(seconds), is that by design? Is there a workaround?
*Everything* is disabled when you enter a system call that blocks.
You've siezed control of the CPU and handed it over to the system.
XForms can only dispatch callbacks when it has control.
Why are you calling sleep()? Can't you use a timeout instead?
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