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MPI_Win_create(3)			     LAM/MPI				MPI_Win_create(3)

       MPI_Win_create -  Specifies an window accessible by remote processes

       #include <mpi.h>
       MPI_Win_create(void *base, MPI_Aint size, int disp_unit,
	       MPI_Info info, MPI_Comm comm, MPI_Win *newwin)

       base   - initial address of window (choice)
       size   - size of window in bytes (nonnegative integer)
	      - local unit size for displacements, in bytes (positive integer)
       info   - info argument (handle)
       comm   - communicator (handle)
       newwin - window object returned by the call (handle)

       Common  choices	for  disp_unit	are 1 (no scaling), and (in C syntax) sizeof(type), for a
       window that consists of an array of elements of type type. The later choice will allow one
       to  use array indices in RMA calls, and have those scaled correctly to byte displacements,
       even in a heterogeneous environment. ( End of advice to users.)	The  info  argument  pro-
       vides optimization hints to the runtime about the expected usage pattern of the window.

       The  various  processes	in the group of comm may specify completely different target win-
       dows, in location, size, displacement units and info arguments. As long as  all	the  get,
       put  and accumulate accesses to a particular process fit their specific target window this
       should pose no problem. The same area in memory may appear in multiple windows, each asso-
       ciated  with  a	different  window object. However, concurrent communications to distinct,
       overlapping windows may lead to erroneous results.

       All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have an additional argu-
       ment 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.

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

       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 values to be returned (in C and Fortran; this error handler is less useful in
       with the C++ MPI bindings.   The  predefined  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++ bindings for
       MPI do not return error values; instead, error values are communicated by throwing  excep-
       tions  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.
	      - No error; MPI routine completed successfully.
	      -  Invalid  communicator.   A  common error is to use a null communicator in a call
	      (not even allowed in MPI_Comm_rank ).
	      - Invalid argument.  Some argument is invalid and is not identified by  a  specific
	      error class.  This is typically a NULL pointer or other such error.
	      - Other error; use MPI_Error_string to get more information about this error code.
	      - An internal error has been detected.  This is fatal.  Please send a bug report to
	      the LAM mailing list (see http://www.lam-mpi.org/contact.php ).

       MPI_Put(3),   MPI_Get(3),   MPI_Accumulate(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),

       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 information about
       each MPI function (most of which is not duplicated in these man pages).



LAM/MPI 6.5.8				    11/10/2002				MPI_Win_create(3)
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