[Xenomai] clock_gettime() vs gettimeofday() have offset when run in real-time
marco.camurri at iit.it
Thu Mar 30 19:35:35 CEST 2017
I need to get the wallclock time from a real-time thread under Xenomai
2.6.4 running on a x86_64 architecture with Ubuntu 14.04
After realizing that calling the function gettimeofday() I was creating
mode switches, I've replaced the call with the clock_gettime() (this
with the parameter CLOCK_REALTIME.
Unfortunately, when comparing the value returned by the call of
clock_gettime() from within the real-time thread and the gettimeofday()
called from a non-realtime thread, they turned out to be about 6 seconds
when running a single non real-time thread with both functions called,
they return the same value.
Is there a way to have the same behavior of gettimeofday from within a
real-time thread without having mode switches?
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