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MPI_Win_attach, MPI_Win_detach - One-sided MPI call that attach
/ detach a window object for RMA operations.
#include <mpi.h>
MPI_Win_attach(MPI_Win win, void *base, MPI_Aint size)
MPI_Win_detach(MPI_Win win, void *base)
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_WIN_ATTACH(WIN, BASE, SIZE, IERROR)
<type> BASE(*)
INTEGER(KIND=MPI_ADDRESS_KIND) SIZE
INTEGER WIN, IERROR
USE mpi_f08
MPI_Win_attach(win, base, size, ierror)
TYPE(MPI_Win), INTENT(IN) :: win
TYPE(*), DIMENSION(..), INTENT(IN) :: base
INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(IN) :: size
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
- win
- A window that was created with MPI_Win_create_dynamic
- base
- Initial address of window (choice).
- size
- Size of window in bytes (nonnegative
integer).
- win
- Window object returned by the call (handle).
- IERROR
- Fortran only: Error status (integer).
MPI_Win_attach
is a one-sided MPI communication collective call executed by all processes
in the group of comm. It returns a window object that can be used by these
processes to perform RMA operations. Each process specifies a window of
existing memory that it exposes to RMA accesses by the processes in the
group of comm. The window consists of size bytes, starting at address base.
A process may elect to expose no memory by specifying size = 0.
If the base
value used by MPI_Win_attach was allocated by MPI_Alloc_mem, the size of
the window can be no larger than the value set by the MPI_ALLOC_MEM function.
Use memory allocated by MPI_Alloc_mem to guarantee properly aligned
window boundaries (such as word, double-word, cache line, page frame, and
so on).
Almost all MPI routines return an error value; C routines
as the value of the function and Fortran routines in the last argument.
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_Comm_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.
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