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36 /*! \libinternal \file
38 * Wraps mpi.h usage in Gromacs.
40 * This header wraps the MPI header <mpi.h>, and should be included instead of
41 * that one. It abstracts away the case that depending on compilation
42 * settings, MPI routines may be provided by <mpi.h> or by thread-MPI.
43 * In the absence of MPI, this header still declares some types for
44 * convenience. It also disables MPI C++ bindings that can cause compilation
48 * \ingroup module_utility
50 #ifndef GMX_UTILITY_GMXMPI_H
51 #define GMX_UTILITY_GMXMPI_H
57 /* MPI C++ binding is deprecated and can cause name conflicts (e.g. stdio/mpi seek) */
58 # define MPICH_SKIP_MPICXX 1
59 # define OMPI_SKIP_MPICXX 1
60 /* disable bindings for SGI MPT also */
61 # define MPI_NO_CPPBIND 1
63 /* Starting with 2.2 MPI_INT64_T is required. Earlier version still might have it.
64 In theory MPI_Datatype doesn't have to be a #define, but current available MPI
65 implementations (OpenMPI + MPICH (+derivates)) use #define and future versions
66 should support 2.2. */
67 # if (MPI_VERSION == 1 || (MPI_VERSION == 2 && MPI_SUBVERSION < 2)) && !defined MPI_INT64_T
69 # if LONG_MAX == 9223372036854775807L
70 # define MPI_INT64_T MPI_LONG
71 # elif LONG_LONG_MAX == 9223372036854775807L
72 # define MPI_INT64_T MPI_LONG_LONG
74 # error No MPI_INT64_T and no 64 bit integer found.
76 # endif /*MPI_INT64_T*/
79 # include "thread_mpi/mpi_bindings.h" /* IWYU pragma: export */
80 # include "thread_mpi/tmpi.h" /* IWYU pragma: export */
82 typedef void* MPI_Comm;
83 typedef void* MPI_Request;
84 typedef void* MPI_Status;
85 typedef void* MPI_Group;
86 # define MPI_COMM_NULL nullptr
87 # define MPI_GROUP_NULL nullptr
88 # define MPI_COMM_WORLD nullptr