win_create.c

刚才是说明 现在是安装程序在 LINUX环境下进行编程的MPICH安装文件

/* -*- 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_Win_create */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_Win_create = PMPI_Win_create
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_Win_create  MPI_Win_create
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_Win_create as PMPI_Win_create
#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_Win_create PMPI_Win_create

#ifndef MPID_WIN_PREALLOC 
#define MPID_WIN_PREALLOC 1
#endif

/* Preallocated op objects */
MPID_Win MPID_Win_direct[MPID_WIN_PREALLOC];
MPIU_Object_alloc_t MPID_Win_mem = { 0, 0, 0, 0, MPID_WIN, 
					    sizeof(MPID_Win), 
					    MPID_Win_direct,
					    MPID_WIN_PREALLOC, };

#endif

#undef FUNCNAME
#define FUNCNAME MPI_Win_create

/*@
   MPI_Win_create - create a window

   Arguments:
+  void *base - base
.  MPI_Aint size - size
.  int disp_unit - disp unit
.  MPI_Info info - info
.  MPI_Comm comm - communicator
-  MPI_Win *win - window

   Notes:

.N Fortran

.N Errors
.N MPI_SUCCESS
@*/
int MPI_Win_create(void *base, MPI_Aint size, int disp_unit, MPI_Info info, 
		   MPI_Comm comm, MPI_Win *win)
{
    static const char FCNAME[] = "MPI_Win_create";
    int mpi_errno = MPI_SUCCESS;
    MPID_Win *win_ptr = NULL;
    MPID_Comm *comm_ptr = NULL;
    MPID_MPI_STATE_DECL(MPID_STATE_MPI_WIN_CREATE);

    MPID_MPI_RMA_FUNC_ENTER(MPID_STATE_MPI_WIN_CREATE);

    /* Verify that MPI has been initialized */
#   ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
	    MPIR_ERRTEST_INITIALIZED(mpi_errno);
	    MPIR_ERRTEST_COMM(comm, mpi_errno);
            if (mpi_errno != MPI_SUCCESS) {
                return MPIR_Err_return_comm( 0, FCNAME, mpi_errno );
            }
	}
        MPID_END_ERROR_CHECKS;
    }
#   endif /* HAVE_ERROR_CHECKING */

    MPID_Comm_get_ptr( comm, comm_ptr );

#   ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
            MPID_Info *info_ptr = NULL;

            MPID_Info_get_ptr( info, info_ptr );

            /* Validate pointers */
	    MPID_Comm_valid_ptr( comm_ptr, mpi_errno );
            if (mpi_errno != MPI_SUCCESS) {
                MPID_MPI_RMA_FUNC_EXIT(MPID_STATE_MPI_WIN_CREATE);
                return MPIR_Err_return_comm( comm_ptr, FCNAME, mpi_errno );
            }
            if (size < 0)
                mpi_errno = MPIR_Err_create_code(MPI_ERR_SIZE,
                                                  "**rmasize",
                                                  "**rmasize %d", size);  
            if (disp_unit <= 0)
                mpi_errno = MPIR_Err_create_code(MPI_ERR_ARG,
                                                 "**arg", "**arg %s", 
                                                 "disp_unit must be positive");  
            if (mpi_errno != MPI_SUCCESS) {
                MPID_MPI_RMA_FUNC_EXIT(MPID_STATE_MPI_WIN_CREATE);
                return MPIR_Err_return_comm( comm_ptr, FCNAME, mpi_errno );
            }
        }
        MPID_END_ERROR_CHECKS;
    }
#   endif /* HAVE_ERROR_CHECKING */

    win_ptr = (MPID_Win *)MPIU_Handle_obj_alloc( &MPID_Win_mem );
    if (!win_ptr) {
        mpi_errno = MPIR_Err_create_code( MPI_ERR_OTHER, "**nomem", 0 );
        MPID_MPI_RMA_FUNC_EXIT(MPID_STATE_MPI_WIN_CREATE);
        return MPIR_Err_return_comm( comm_ptr, FCNAME, mpi_errno );
    }

    win_ptr->fence_cnt = 0;
    win_ptr->base = base;
    win_ptr->size = size;
    win_ptr->disp_unit = disp_unit;
    mpi_errno = NMPI_Comm_dup(comm, &(win_ptr->comm));

    /* return the handle of the window object to the user */
    *win = win_ptr->handle;
    
    MPID_MPI_RMA_FUNC_EXIT(MPID_STATE_MPI_WIN_CREATE);
    return mpi_errno;
}