root/mpich2/trunk/src/mpi/datatype/type_create_struct.c @ 4888

/* -*- Mode: C; c-basic-offset:4 ; -*- */
/*
 *
 *  (C) 2001 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */

#include "mpiimpl.h"

/* -- Begin Profiling Symbol Block for routine MPI_Type_create_struct */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_Type_create_struct = PMPI_Type_create_struct
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_Type_create_struct  MPI_Type_create_struct
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_Type_create_struct as PMPI_Type_create_struct
#endif
/* -- End Profiling Symbol Block */

/* Define MPICH_MPI_FROM_PMPI if weak symbols are not supported to build
   the MPI routines */
#ifndef MPICH_MPI_FROM_PMPI
#undef MPI_Type_create_struct
#define MPI_Type_create_struct PMPI_Type_create_struct

#endif

#undef FUNCNAME
#define FUNCNAME MPI_Type_create_struct

/*@
   MPI_Type_create_struct - Create an MPI datatype from a general set of
   datatypes, displacements, and block sizes

   Input Parameters:
+ count - number of blocks (integer) --- also number of entries in arrays
  array_of_types, array_of_displacements and array_of_blocklengths
. array_of_blocklength - number of elements in each block (array of integer)
. array_of_displacements - byte displacement of each block (array of address integer)
- array_of_types - type of elements in each block (array of handles to
  datatype objects)

   Output Parameter:
. newtype - new datatype (handle)

.N ThreadSafe

.N Fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_ARG
.N MPI_ERR_TYPE
@*/
int MPI_Type_create_struct(int count,
                           int array_of_blocklengths[],
                           MPI_Aint array_of_displacements[],
                           MPI_Datatype array_of_types[],
                           MPI_Datatype *newtype)
{
    static const char FCNAME[] = "MPI_Type_create_struct";
    int mpi_errno = MPI_SUCCESS;
    int i, *ints;
    MPID_Datatype *new_dtp;
    MPIU_CHKLMEM_DECL(1);
    MPID_MPI_STATE_DECL(MPID_STATE_MPI_TYPE_CREATE_STRUCT);

    MPIR_ERRTEST_INITIALIZED_ORDIE();

    MPIU_THREAD_CS_ENTER(ALLFUNC,);
    MPID_MPI_FUNC_ENTER(MPID_STATE_MPI_TYPE_CREATE_STRUCT);

#   ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
            int j;
            MPID_Datatype *datatype_ptr = NULL;

            MPIR_ERRTEST_COUNT(count,mpi_errno);
            if (mpi_errno != MPI_SUCCESS) goto fn_fail;

            if (count > 0) {
                MPIR_ERRTEST_ARGNULL(array_of_blocklengths, "blocklens", mpi_errno);
                MPIR_ERRTEST_ARGNULL(array_of_displacements, "indices", mpi_errno);
                MPIR_ERRTEST_ARGNULL(array_of_types, "types", mpi_errno);
                if (mpi_errno != MPI_SUCCESS) goto fn_fail;
            }

            for (j=0; j < count; j++) {
                MPIR_ERRTEST_ARGNEG(array_of_blocklengths[j], "blocklen", mpi_errno);
                MPIR_ERRTEST_DATATYPE(array_of_types[j], "datatype[j]",
                                      mpi_errno);
                if (mpi_errno != MPI_SUCCESS) goto fn_fail;
                        
                if (array_of_types[j] != MPI_DATATYPE_NULL && HANDLE_GET_KIND(array_of_types[j]) != HANDLE_KIND_BUILTIN) {
                    MPID_Datatype_get_ptr(array_of_types[j], datatype_ptr);
                    MPID_Datatype_valid_ptr(datatype_ptr, mpi_errno);
                    if (mpi_errno != MPI_SUCCESS) goto fn_fail;
                }
            }
        }
        MPID_END_ERROR_CHECKS;
    }
#   endif /* HAVE_ERROR_CHECKING */

    /* ... body of routine ... */

    mpi_errno = MPID_Type_struct(count,
                                 array_of_blocklengths,
                                 array_of_displacements,
                                 array_of_types,
                                 newtype);

    /* --BEGIN ERROR HANDLING-- */
    if (mpi_errno != MPI_SUCCESS)
        goto fn_fail;
    /* --END ERROR HANDLING-- */

    MPIU_CHKLMEM_MALLOC_ORJUMP(ints, int *, (count + 1) * sizeof(int), mpi_errno, "content description");

    ints[0] = count;
    for (i=0; i < count; i++)
    {
        ints[i+1] = array_of_blocklengths[i];
    }

    MPID_Datatype_get_ptr(*newtype, new_dtp);
    mpi_errno = MPID_Datatype_set_contents(new_dtp,
                                           MPI_COMBINER_STRUCT,
                                           count+1, /* ints (cnt,blklen) */
                                           count, /* aints (disps) */
                                           count, /* types */
                                           ints,
                                           array_of_displacements,
                                           array_of_types);

    if (mpi_errno != MPI_SUCCESS) goto fn_fail;

    /* ... end of body of routine ... */

  fn_exit:
    MPIU_CHKLMEM_FREEALL();
    MPID_MPI_FUNC_EXIT(MPID_STATE_MPI_TYPE_CREATE_STRUCT);
    MPIU_THREAD_CS_EXIT(ALLFUNC,);
    return mpi_errno;

  fn_fail:
    /* --BEGIN ERROR HANDLING-- */
#   ifdef HAVE_ERROR_CHECKING
    {
        mpi_errno = MPIR_Err_create_code(
            mpi_errno, MPIR_ERR_RECOVERABLE, FCNAME, __LINE__, MPI_ERR_OTHER, "**mpi_type_create_struct",
            "**mpi_type_create_struct %d %p %p %p %p", count, array_of_blocklengths, array_of_displacements,
            array_of_types, newtype);
    }
#   endif
    mpi_errno = MPIR_Err_return_comm(NULL, FCNAME, mpi_errno);
    goto fn_exit;
    /* --END ERROR HANDLING-- */
}