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