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MPI_Win_start - Starts an RMA access epoch for win
#include <mpi.h>
int MPI_Win_start(MPI_Group group, int assert, MPI_Win win)
INCLUDE ’mpif.h’
MPI_WIN_START(GROUP, ASSERT, WIN, IERROR)
INTEGER GROUP, ASSERT, WIN, IERROR
#include <mpi.h>
void MPI::Win::Start(const MPI::Group& group, int assert) const
- group
- The group of target processes (handle).
- assert
- Program
assertion (integer).
- win
- Window object (handle).
- IERROR
- Fortran only: Error status (integer).
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 following 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.
Almost all MPI routines return an error value; C routines
as the value of the function and Fortran routines in the last argument.
C++ functions do not return errors. If the default error handler is set
to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism
will be used to throw an MPI::Exception object.
Before the error value is
returned, the current MPI error handler is called. By default, this error
handler aborts the MPI job, except for I/O function errors. The error handler
may be changed with MPI_Win_set_errhandler; the predefined error handler
MPI_ERRORS_RETURN may be used to cause error values to be returned. Note
that MPI does not guarantee that an MPI program can continue past an error.
MPI_Win_post MPI_Win_complete
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