[OMPI users] multiple threads synchronization with Openmpi

[Yuan, Huapeng]

Hi,

Can I use openmpi API like MPI_Reduce or MPI_Gather to synchronize 
multiple theads in a process?

In my test in redhat linux, MPI_Comm_rank return 0 for all threads in 
the same process. If I want to use the MPI functions like MPI_Reduce or 
MPI_Gather, the  rank number shoule be different for each threads.

Do you have any suggestions? Thanks.

Hua