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NAME

       MPI_Win_fence -  Perform an MPI fence synchronization on a MPI window

SYNOPSIS

       int MPI_Win_fence(int assert, MPI_Win win)

INPUT PARAMETERS

       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_fence
       operation.   The  value zero is always correct.  Other assertion values
       may be or'ed together.  Assertions that  are  valid  for  MPI_Win_fence
       are:

       MPI_MODE_NOSTORE
              - the local window was not updated by local stores (or local get
              or receive calls) since last synchronization.
       MPI_MODE_NOPUT
              - the local window will not be  updated  by  put  or  accumulate
              calls   after   the   fence  call,  until  the  ensuing  (fence)
              synchronization.
       MPI_MODE_NOPRECEDE
              - the fence does not complete any sequence of locally issued RMA
              calls.  If  this assertion is given by any process in the window
              group, then it must be given by all processes in the group.
       MPI_MODE_NOSUCCEED
              - the fence does not start any sequence of  locally  issued  RMA
              calls.  If  the  assertion is given by any process in the window
              group, then it must be given by all processes in the group.

THREAD AND INTERRUPT SAFETY

       This routine is thread-safe.  This  means  that  this  routine  may  be
       safely  used by multiple threads without the need for any user-provided
       thread locks.  However, the routine is not interrupt safe.   Typically,
       this  is due to the use of memory allocation routines such as malloc or
       other non-MPICH runtime routines that  are  themselves  not  interrupt-
       safe.

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 guarentee 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_OTHER
              -  Other  error;  use  MPI_Error_string  to get more information
              about this error code.
       MPI_ERR_WIN
              - Invalid MPI window object

LOCATION

       /tmp/gyCYfBi4J6/mpich-3.1/src/mpi/rma/win_fence.c

                                   2/20/2014                  MPI_Win_fence(3)



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