Reference documentation for deal.II version 9.5.0
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mpi_stub.h
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1// ---------------------------------------------------------------------
2//
3// Copyright (C) 2011 - 2023 by the deal.II authors
4//
5// This file is part of the deal.II library.
6//
7// The deal.II library is free software; you can use it, redistribute
8// it, and/or modify it under the terms of the GNU Lesser General
9// Public License as published by the Free Software Foundation; either
10// version 2.1 of the License, or (at your option) any later version.
11// The full text of the license can be found in the file LICENSE.md at
12// the top level directory of deal.II.
13//
14// ---------------------------------------------------------------------
15
16#ifndef dealii_mpi_stub_h
17#define dealii_mpi_stub_h
18
19#include <deal.II/base/config.h>
20
21// If we have mpi.h then include it. Otherwise, define some common MPI data
22// types and global constants for the no-MPI case. This way we can still use,
23// e.g., MPI_Comm in the API.
24
25#if defined(DEAL_II_WITH_MPI) || defined(DEAL_II_WITH_PETSC)
26# include <mpi.h>
27#else
28// without MPI, we would still like to use
29// some constructs with MPI data
30// types. Therefore, create some dummies
31using MPI_Comm = int;
32using MPI_Request = int;
33using MPI_Datatype = int;
34using MPI_Op = int;
35# ifndef MPI_COMM_WORLD
36# define MPI_COMM_WORLD 0
37# endif
38# ifndef MPI_COMM_SELF
39# define MPI_COMM_SELF 0
40# endif
41# ifndef MPI_COMM_NULL
42# define MPI_COMM_NULL 0
43# endif
44# ifndef MPI_REQUEST_NULL
45# define MPI_REQUEST_NULL 0
46# endif
47# ifndef MPI_MIN
48# define MPI_MIN 0
49# endif
50# ifndef MPI_MAX
51# define MPI_MAX 0
52# endif
53# ifndef MPI_SUM
54# define MPI_SUM 0
55# endif
56# ifndef MPI_LOR
57# define MPI_LOR 0
58# endif
59#endif
60
61#endif