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       MPI_Win_post -  Start an RMA exposure epoch


       int MPI_Win_post(MPI_Group group, int assert, MPI_Win win)


       group  - group of origin processes (handle)
       assert - Used to optimize this call; zero may be used as a default.  See notes. (integer)
       win    - window object (handle)


       The  assert  argument  is  used  to  indicate  special  conditions  for  the fence that an
       implementation may use to optimize the MPI_Win_post operation.  The value zero  is  always
       correct.   Other  assertion  values  may be or'ed together.  Assertions that are valid for
       MPI_Win_post are:

              - the matching calls to MPI_WIN_START have not yet occurred on any origin processes
              when  the  call  to MPI_WIN_POST is made.  The nocheck option can be specified by a
              post call if and only if it is specified by each matching start call.
              - the local window was not updated by local stores (or local get or receive  calls)
              since  last  synchronization.  This may avoid the need for cache synchronization at
              the post call.
              - the local window will not be updated by put or accumulate calls  after  the  post
              call,  until  the ensuing (wait) synchronization. This may avoid the need for cache
              synchronization at the wait call.


       All MPI routines in Fortran (except for MPI_WTIME  and  MPI_WTICK  )  have  an  additional
       argument  ierr  at  the  end  of  the  argument list.  ierr is an integer and has the same
       meaning as the  return  value  of  the  routine  in  C.   In  Fortran,  MPI  routines  are
       subroutines, and are invoked with the call statement.

       All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in Fortran.


       All  MPI  routines  (except MPI_Wtime and MPI_Wtick ) return an error value; C routines as
       the value of the function and Fortran routines in the last argument.  Before the value  is
       returned,  the current MPI error handler is called.  By default, this error handler aborts
       the MPI  job.   The  error  handler  may  be  changed  with  MPI_Comm_set_errhandler  (for
       communicators),  MPI_File_set_errhandler  (for files), and MPI_Win_set_errhandler (for RMA
       windows).  The MPI-1 routine MPI_Errhandler_set may be used but  its  use  is  deprecated.
       The  predefined  error  handler  MPI_ERRORS_RETURN may be used to cause error values to be
       returned.  Note that MPI does not guarentee that an  MPI  program  can  continue  past  an
       error; however, MPI implementations will attempt to continue whenever possible.

              - No error; MPI routine completed successfully.

                                            11/21/2018                            MPI_Win_post(3)