MPI_Win_create -  Specifies an window accessible by remote
       processes


SYNOPSIS

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


INPUT PARAMETERS

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


NOTES

       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  provides 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  windows, 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 prob­
       lem.  The  same area in memory may appear in multiple win­
       dows, each associated with a different window object. How­
       ever,  concurrent  communications to distinct, overlapping
       windows may lead to erroneous results.


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.

       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
       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_COMM
              - Invalid communicator.  A common error is to use a
              null  communicator  in  a call (not even allowed in
              MPI_Comm_rank ).
       MPI_ERR_ARG
              - 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.
       MPI_ERR_OTHER
              - Other error; use  MPI_Error_string  to  get  more
              information about this error code.
       MPI_ERR_INTERN
              -  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 ).


SEE ALSO

       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), MPI_Win_wait(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  infor­
       mation  about  each  MPI  function  (most  of which is not
       duplicated in these man pages).

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


LOCATION

       wcreate.c


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