src/gromacs/utility/gmxmpi.h

   1 /*
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  35 /*! \libinternal \file
  36  * \brief
  37  * Wraps mpi.h usage in Gromacs.
  38  *
  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
  44  * issues.
  45  *
  46  * \inlibraryapi
  47  * \ingroup module_utility
  48  */
  49 #ifndef GMX_UTILITY_GMXMPI_H
  50 #define GMX_UTILITY_GMXMPI_H
  51
  52 #include "config.h"
  53
  54 /*! \cond */
  55 #if GMX_LIB_MPI
  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
  59 /* disable bindings for SGI MPT also */
  60 #define MPI_NO_CPPBIND 1
  61 #include <mpi.h>
  62 /* Starting with 2.2 MPI_INT64_T is required. Earlier version still might have it.
  63    In theory MPI_Datatype doesn't have to be a #define, but current available MPI
  64    implementations (OpenMPI + MPICH (+derivates)) use #define and future versions
  65    should support 2.2. */
  66 #if (MPI_VERSION == 1 || (MPI_VERSION == 2 && MPI_SUBVERSION < 2)) && !defined MPI_INT64_T
  67 #include <limits.h>
  68 #if LONG_MAX == 9223372036854775807L
  69 #define MPI_INT64_T MPI_LONG
  70 #elif LONG_LONG_MAX == 9223372036854775807L
  71 #define MPI_INT64_T MPI_LONG_LONG
  72 #else
  73 #error No MPI_INT64_T and no 64 bit integer found.
  74 #endif
  75 #endif /*MPI_INT64_T*/
  76 #else
  77 #if GMX_THREAD_MPI
  78 #include "thread_mpi/mpi_bindings.h" /* IWYU pragma: export */
  79 #include "thread_mpi/tmpi.h"         /* IWYU pragma: export */
  80 #else
  81 typedef void* MPI_Comm;
  82 typedef void* MPI_Request;
  83 typedef void* MPI_Status;
  84 typedef void* MPI_Group;
  85 #define MPI_COMM_NULL  nullptr
  86 #define MPI_GROUP_NULL nullptr
  87 #define MPI_COMM_WORLD nullptr
  88 #endif
  89 #endif
  90 //! \endcond
  91
  92 #endif