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 _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss