Fill state%ub halo cells from MPI neighbours in both x and y directions.
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| type(solver_state_2d_t), | intent(inout) | :: | state |
Solver state (ub must already be allocated via allocate_work_arrays_2d). |
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| type(decomp_2d_t), | intent(in) | :: | d |
Per-rank 2D decomposition (neighbour ranks, local extents). |