Man Linux: Main Page and Category List

NAME

       MPI_Win_start -  Starts an RMA access epoch

SYNOPSIS

       #include <mpi.h>
       int MPI_Win_start(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 access epoch for win. RMA calls issued on win during this
       epoch must access only windows at processes in group. Each  process  in
       group  must issue a matching call to MPI_WIN_POST. RMA accesses to each
       target window will be delayed, if necessary, until the  target  process
       executed the matching call to MPI_WIN_POST. MPI_WIN_START is allowed to
       block until the corresponding MPI_WIN_POST calls are executed,  but  is
       not required to.

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.

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
       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  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_OTHER
              -  Other  error;  use  MPI_Error_string  to get more information
              about this error code.
       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_Accumulate(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 information about each MPI function (most of
       which is not duplicated in these man pages).

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

LOCATION

       wstart.c