Thanks for your reply.

The complete system version goes as follows:

Linux Moxa 2.6.23.1 #1266 Fri Nov 14 19:05:06 EST 2008 armv5teb unknown

UC-8410 version 1.0

It is an embedded MOXA computer. Does this mean that shared memory objects are not fully implemented on this operating system? On some of this device’s predecessors, I used standard Unix semaphores for this task, before I switched to the new boost version when the interprocess library was introduced in version 1.39.0. Would returning to this manual solution work or do semaphores not function at all on this machine?

Thanks again and best regards

Pascal