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NAME
MPI_Win_start - Starts an RMA access epoch for win
SYNTAX
C Syntax
#include <mpi.h>
int MPI_Win_start(MPI_Group group, int assert, MPI_Win win)
Fortran Syntax
INCLUDE 'mpif.h'
MPI_WIN_START(GROUP, ASSERT, WIN, IERROR)
INTEGER GROUP, ASSERT, WIN, IERROR
C++ Syntax
#include <mpi.h>
void MPI::Win::Start(const MPI::Group& group, int assert) const
INPUT PARAMETERS
group The group of target processes (handle).
assert Program assertion (integer).
win Window object (handle).
OUTPUT PARAMETERS
IERROR Fortran only: Error status (integer).
DESCRIPTION
MPI_Win_start is a one-sided MPI communication synchronization call
that 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. MPI_Win_start is
allowed to block until the corresponding MPI_Win_post calls have been
executed, but is not required to.
The assert argument is used to provide assertions on the context of the
call that may be used for various optimizations. (See Section 6.4.4 of
the MPI-2 Standard.) A value of assert = 0 is always valid. The follow-
ing assertion value is supported:
MPI_MODE_NOCHECK
When this value is passed in to this call, the library
assumes that the post call on the target has been called and
it is not necessary for the library to check to see if such a
call has been made.
ERRORS
Almost all MPI routines return an error value; C routines as the value
of the function and Fortran routines in the last argument. C++ func-
tions do not return errors. If the default error handler is set to
not guarantee that an MPI program can continue past an error.
SEE ALSO
MPI_Win_post MPI_Win_complete
Open MPI 1.2 March 2007 MPI_Win_start(3OpenMPI)
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