
Per discussion at https://github.com/open-mpi/ompi/issues/2614#issuecomment-392815654, do not allow for selection of the OSC PT2PT when creating an MPI RMA window when THREAD_MULTIPLE is active. Print a helpful message and return a not-supported error. Signed-off-by: Howard Pritchard <howardp@lanl.gov> Signed-off-by: Jeff Squyres <jsquyres@cisco.com> (cherry picked from commit d0ffd660841623c02d1dfa3151e7f7afd3327698) Signed-off-by: Jeff Squyres <jsquyres@cisco.com>