Dear all,

I have some issue with MPI_Win_lock in MPICH-3.1.4 on Blue Gene/Q.

Here is my example:

Process 0:

Win_lock(MPI_LOCK_SHARED, target=A)
Win_lock(MPI_LOCK_SHARED, target=B)

No matter what I use for A and B (given A != B), a process cannot acquire more than one lock
at a time.

To my understanding, it should be possible to acquire more than one lock.

Can you confirm this issue?

Thanks,
Sebastian
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