MPI_Win_fence  -  Synchronizes one-sided communications on
       a window


SYNOPSIS

       #include <mpi.h>
       int
       MPI_Win_fence(int assertion, MPI_Win win)


INPUT PARAMETERS

       assertion
              - program assertion (integer)
       win    - window object (handle)


NOTES

       The MPI call MPI_WIN_FENCE(assert, win)  synchronizes  RMA
       calls  on win. The call is collective on the group of win.
       All RMA operations on win originating at a  given  process
       and  started  before  the fence call will complete at that
       process before the fence call returns. They will  be  com­
       pleted  at  their  target before the fence call returns at
       the target. RMA operations on win  started  by  a  process
       after the fence call returns will access their target win­
       dow only after MPI_WIN_FENCE has been called by the target
       process.

       Calls  to  MPI_WIN_FENCE  should  both  precede and follow
       calls to put, get or accumulate that are synchronized with
       fence calls.


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

       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
       an error value; C routines as the value  of  the  function
       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_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.
       MPI_ERR_OTHER
              -  Other  error;  use  MPI_Error_string to get more
              information about this error code.

              seealso MPI_Put(3), MPI_Get(3),  MPI_Win_create(3),
              MPI_Win_start(3),  MPI_Win_complete(3), MPI_Accumu­
              late(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

       wfence.c


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