Experimental Physics and
Industrial Control System

Heinz Junkes via Core-talk <core-talk at aps.anl.gov> · Mon, 04 Jan 2021 12:57:38 -0000

> Yes, even RTEMS5 without the new libbsd-network-stack has not defined
> _XOPEN_SOURCE and asks for the old implementation. I can set _XOPEN_SOURCE by
> hand and it works so far with it. But what I noticed in this context and I
> think that the mutexes may be used incorrectly in some modules and therefore
> it comes to problems such as: "mutex not owned by the task".
> 
> I saw the whole thing in the context of MotorRecords (OMS):
> 
> https://github.com/epics-modules/motor/issues/172
> 
> I see a general problem that probably in some places mutexes are created in
> the iocInit task and then used afterwards in other tasks although the iocInit
> task has been terminated.
> 
> As I understand it, mutexes should generally be created in the tasks in which
> they are also used? Or with shared memory the creating task must remain
> however existing?

If you build RTEMS with the POSIX_FLAGS like in Linux (-D_GNU_SOURCE -D_DEFAULT_SOURCE) then with the help of includes/sys/features.h  _XOPENS_SOURCE is defined to 700.

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System