The following three attributes are cached with a window, when the
window is created.
MPI_WIN_BASEwindow base address.
MPI_WIN_SIZE window size, in bytes.
MPI_WIN_DISP_UNITdisplacement unit associated with the
window.
In C, calls to
MPI_Win_get_attr(win, MPI_WIN_BASE, &base, &flag),
MPI_Win_get_attr(win, MPI_WIN_SIZE, &size, &flag) and
MPI_Win_get_attr(win, MPI_WIN_DISP_UNIT, &disp_unit, &flag)
will return in base a pointer to the start of the window
win, and will return in size and disp_unit
pointers to the size and displacement unit of the window,
respectively. And similarly, in C++.
In Fortran, calls to MPI_WIN_GET_ATTR(win, MPI_WIN_BASE,
base, flag, ierror),
MPI_WIN_GET_ATTR(win, MPI_WIN_SIZE, size, flag, ierror) and
MPI_WIN_GET_ATTR(win, MPI_WIN_DISP_UNIT, disp_unit,
flag, ierror)
will return in base, size and disp_unit the
(integer representation of) the base address, the
size and the displacement unit of the window win, respectively.
(The window attribute access functions are defined in
Section Windows
, page Windows
.)
The other ``window attribute,'' namely the group of processes attached
to the window, can be retrieved using the call below.
| MPI_WIN_GET_GROUP(win, group) | |
| IN win | window object (handle) |
| OUT group | group of processes which share access to the window (handle) |
int MPI_Win_get_group(MPI_Win win, MPI_Group *group)
MPI_WIN_GET_GROUP(WIN, GROUP, IERROR)
INTEGER WIN, GROUP, IERROR
MPI::Group MPI::Win::Get_group() const
MPI_WIN_GET_GROUP returns a duplicate of the group of the communicator used to create the window. associated with win. The group is returned in group.