Hey there,

more questions! We encountered some problems using vtimer.  For once, setting 
multiple short timers consecutively leads to a segfault. We tired this with the 
timer_msg test reducing the intervals to around 150ms.

A second problem showed up when setting multiple timers at once, e.g., from 
different threads. After a short time the "timer is already due” warning from 
schedule timer in hwtimer_cpu.c flashed and soon after the timers simply 
stopped.

So, I am not sure if these problems originate in our own implementation or the 
native port. In order to test the short timers, we executed the same program on 
the iot-lab_M3 board, where it worked even with much shorter timers. 

Anything I should know?

Thanks
Raphael
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