status_set_elements.c

mpi并行计算的c++代码 可用vc或gcc编译通过 可以用来搭建并行计算试验环境

/* -*- 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_Status_set_elements */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_Status_set_elements = PMPI_Status_set_elements
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_Status_set_elements  MPI_Status_set_elements
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_Status_set_elements as PMPI_Status_set_elements
#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
#define MPI_Status_set_elements PMPI_Status_set_elements

#endif

#undef FUNCNAME
#define FUNCNAME MPI_Status_set_elements

/*@
   MPI_Status_set_elements - Set the number of elements in a status

   Input Parameters:
+ status - status to associate count with (Status) 
. datatype - datatype associated with count (handle) 
- count - number of elements to associate with status (integer) 

.N ThreadSafe

.N Fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_ARG
.N MPI_ERR_TYPE
@*/
int MPI_Status_set_elements(MPI_Status *status, MPI_Datatype datatype, 
			    int count)
{
    static const char FCNAME[] = "MPI_Status_set_elements";
    int mpi_errno = MPI_SUCCESS;
    int size;
    MPID_MPI_STATE_DECL(MPID_STATE_MPI_STATUS_SET_ELEMENTS);

    MPIR_ERRTEST_INITIALIZED_ORDIE();
    
    MPID_CS_ENTER();
    MPID_MPI_FUNC_ENTER(MPID_STATE_MPI_STATUS_SET_ELEMENTS);
    
    /* Validate parameters and objects (post conversion) */
#   ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
	    MPID_Datatype *datatype_ptr = NULL;

	    MPIR_ERRTEST_COUNT(count,mpi_errno);
	    MPIR_ERRTEST_ARGNULL(status,"status",mpi_errno);
	    MPIR_ERRTEST_DATATYPE(datatype, "datatype", mpi_errno);
            if (mpi_errno) goto fn_fail;

            /* Validate datatype_ptr */
	    MPID_Datatype_get_ptr( datatype, datatype_ptr );
            MPID_Datatype_valid_ptr( datatype_ptr, mpi_errno );
	    /* If datatype_ptr is not valid, it will be reset to null */
            if (mpi_errno) goto fn_fail;
        }
        MPID_END_ERROR_CHECKS;
    }
#   endif /* HAVE_ERROR_CHECKING */

    /* ... body of routine ... */
    
    MPID_Datatype_get_size_macro(datatype, size);
    /* FIXME: The device may want something else here */
    status->count = count * size;

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

  fn_exit:
    MPID_MPI_FUNC_EXIT(MPID_STATE_MPI_STATUS_SET_ELEMENTS);
    MPID_CS_EXIT();
    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_status_set_elements",
	    "**mpi_status_set_elements %p %D %d", status, datatype, count);
    }
#   endif
    mpi_errno = MPIR_Err_return_comm( NULL, FCNAME, mpi_errno );
    goto fn_exit;
    /* --END ERROR HANDLING-- */
}