Thanks Lukasz ... we will try this tomorrow then. Where do we insert the barrier, before
a) the if in https://github.com/xrootd/xrootd/blob/master/src/XrdSys/XrdSysPthread.hh#L341
or really before
b) https://github.com/xrootd/xrootd/blob/master/src/XrdCl/XrdClMessageUtils.hh#L66
? In case b) it will also be there for the libc semaphores that seem to be ok now.
With glibc-2.22 things work ok, the helgrind reports about SyncHandler are gone.
A question: why are semaphores better than condition variables in this case?
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