In one of our applications we extencively use motif timers. The problem is that sometimes callbacks functions are not invoked. Does any one know any problems with Motif 1.2 timers and are there any fixes?

As far as I know, there are no problems with Motif 1.2 timers. Normally, the problem is with the program and how the timers are used. Motif is single threaded so basically, all Motif calls should be on the same thread. If one of the callbacks is messing with the X-message loop, the the timer is sometimes missed.

If the timer calls a work procedure, there may be problems as work procedures are stacked. Only when the last one in finishes does the previous one run. If it is being used with work procedures, make up an internal queueing mechanism and keep to one work procedure.

Try re-invoking the timer at the end of the callback instead of at the start.

Thanks for reply.
I contacted HP and here is what I learned from them: The timers added by XtAppAddTimeOut may not be invoked at all the times. HP had a patch for this problem and following cumulative patches. By the way it is common not only for HPUX