NAME

       MPI_Win_post -  Start an RMA exposure epoch

SYNOPSIS

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

INPUT PARAMETERS

       group  - group of origin processes (handle)
       assert - program assertion (integer)
       win    - window object (handle)

NOTES

       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:

       MPI_MODE_NOCHECK
              - 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.
       MPI_MODE_NOSTORE
              - 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.
       MPI_MODE_NOPUT
              -  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.

NOTES FOR FORTRAN

       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.

ERRORS

       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 guarantee that an MPI program can continue past an error; however, MPI
       implementations will attempt to continue whenever possible.

       MPI_SUCCESS
              - No error; MPI routine completed successfully.
       MPI_ERR_GROUP
              - Null or invalid group passed to function.
       MPI_ERR_WIN
              - Invalid MPI window object
       MPI_ERR_OTHER
              - Other error; use MPI_Error_string to get more information about this error code.

                                                    2/9/2024                                     MPI_Win_post(3)