MPI_Win_post  -   Starts an RMA exposure epoch for a local
       window


SYNOPSIS

       #include <mpi.h>
       int MPI_Win_post(MPI_Group group, int assertion, MPI_Win win)


INPUT PARAMETERS

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


NOTES

       Starts an RMA exposure epoch for the local window  associ­
       ated  with  win. Only processes in group should access the
       window with RMA calls on win during this epoch. Each  pro­
       cess in group must issue a matching call to MPI_WIN_START.
       MPI_WIN_POST does not block.


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 For­
       tran, 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.


USAGE WITH IMPI EXTENSIONS

       The IMPI standard only supports MPI-1  functions.   Hence,
       this  function is currently not designed to operate within
       an IMPI job.


ERRORS

       If an error occurs in an MPI  function,  the  current  MPI
       error  handler  is  called to handle it.  By default, this
       error handler aborts the MPI job.  The error  handler  may
       be  changed with MPI_Errhandler_set ; the predefined error
       handler MPI_ERRORS_RETURN may be used to cause error  val­
       ues  to  be returned (in C and Fortran; this error handler
       is less useful in with the C++ MPI bindings.   The  prede­
       fined error handler MPI::ERRORS_THROW_EXCEPTIONS should be
       used in C++ if the error value  needs  to  be  recovered).
       Note  that  MPI does not guarantee that an MPI program can
       continue past an error.

       All MPI routines (except MPI_Wtime and MPI_Wtick )  return

       and Fortran routines in the last argument.  The C++  bind­
       ings  for  MPI  do not return error values; instead, error
       values are communicated by  throwing  exceptions  of  type
       MPI::Exception  (but not by default).  Exceptions are only
       thrown if the error value is not MPI::SUCCESS .

       Note that if the MPI::ERRORS_RETURN handler is set in C++,
       while  MPI functions will return upon an error, there will
       be no way to recover what the actual error value was.
       MPI_SUCCESS
              - No error; MPI routine completed successfully.
       MPI_ERR_WIN
              - Invalid window.  A common error is to use a  null
              window in a call.
       MPI_ERR_GROUP
              - Null group passed to function.
       MPI_ERR_EPOCH
              -  This  error indicates than an operation has been
              attempted on a "closed" window.  Certain  one-sided
              operations  can  only be performed on windows whose
              epoch has been started with MPI_Win_start.


SEE ALSO

       MPI_Put(3),         MPI_Get(3),         MPI_Win_create(3),
       MPI_Win_start(3),  MPI_Win_complete(3),  MPI_Win_fence(3),
       MPI_Win_free(3),                     MPI_Win_get_group(3),
       MPI_Win_get_group(3), MPI_Win_wait(3)


MORE INFORMATION

       For  more  information,  please see the official MPI Forum
       web site, which contains the text of both  the  MPI-1  and
       MPI-2  standards.  These documents contain detailed infor­
       mation about each MPI  function  (most  of  which  is  not
       duplicated in these man pages).

       http://www.mpi-forum.org/


LOCATION

       wpost.c


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