ssend.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_Ssend */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_Ssend = PMPI_Ssend
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_Ssend  MPI_Ssend
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_Ssend as PMPI_Ssend
#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_Ssend PMPI_Ssend

#endif

#undef FUNCNAME
#define FUNCNAME MPI_Ssend

/*@
    MPI_Ssend - Basic synchronous send

Input Parameters:
+ buf - initial address of send buffer (choice) 
. count - number of elements in send buffer (nonnegative integer) 
. datatype - datatype of each send buffer element (handle) 
. dest - rank of destination (integer) 
. tag - message tag (integer) 
- comm - communicator (handle) 

.N fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_COMM
.N MPI_ERR_COUNT
.N MPI_ERR_TYPE
.N MPI_ERR_TAG
.N MPI_ERR_RANK
@*/
int MPI_Ssend(void *buf, int count, MPI_Datatype datatype, int dest, int tag,
	      MPI_Comm comm)
{
    static const char FCNAME[] = "MPI_Ssend";
    int mpi_errno = MPI_SUCCESS;
    MPID_Comm *comm_ptr = NULL;
    MPID_Request * request_ptr = NULL;
    MPID_MPI_STATE_DECL(MPID_STATE_MPI_SSEND);

    /* 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) {
                return MPIR_Err_return_comm( 0, FCNAME, mpi_errno );
            }
	}
        MPID_END_ERROR_CHECKS;
    }
#   endif /* HAVE_ERROR_CHECKING */
	    
    MPID_MPI_PT2PT_FUNC_ENTER_FRONT(MPID_STATE_MPI_SSEND);
    
    /* ... body of routine ...  */
    
    /* Convert MPI object handles to object pointers */
    MPID_Comm_get_ptr( comm, comm_ptr );

    /* Validate parameters if error checking is enabled */
#   ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
	    MPID_Datatype * datatype_ptr = NULL;
	    
            MPID_Comm_valid_ptr( comm_ptr, mpi_errno );
            if (mpi_errno) {
                MPID_MPI_PT2PT_FUNC_EXIT(MPID_STATE_MPI_SSEND);
                return MPIR_Err_return_comm( NULL, FCNAME, mpi_errno );
            }

	    MPIR_ERRTEST_COUNT(count, mpi_errno);
	    MPIR_ERRTEST_DATATYPE(count, datatype, mpi_errno);
	    MPIR_ERRTEST_SEND_RANK(comm_ptr, dest, mpi_errno);
	    MPIR_ERRTEST_SEND_TAG(tag, mpi_errno);
            if (mpi_errno) {
                MPID_MPI_PT2PT_FUNC_EXIT(MPID_STATE_MPI_SSEND);
                return MPIR_Err_return_comm( comm_ptr, FCNAME, mpi_errno );
            }
	    
	    MPID_Datatype_get_ptr(datatype, datatype_ptr);
            MPID_Datatype_valid_ptr( datatype_ptr, mpi_errno );
	    MPIR_ERRTEST_USERBUFFER(buf,count,datatype,mpi_errno);
            if (mpi_errno) {
                MPID_MPI_PT2PT_FUNC_EXIT(MPID_STATE_MPI_SSEND);
                return MPIR_Err_return_comm( comm_ptr, FCNAME, mpi_errno );
            }
        }
        MPID_END_ERROR_CHECKS;
    }
#   endif /* HAVE_ERROR_CHECKING */

    mpi_errno = MPID_Ssend(buf, count, datatype, dest, tag, comm_ptr,
			   MPID_CONTEXT_INTRA_PT2PT, &request_ptr);
    if (mpi_errno == MPI_SUCCESS)
    {
	if (request_ptr == NULL)
	{
		MPID_MPI_PT2PT_FUNC_EXIT(MPID_STATE_MPI_SSEND);
		return MPI_SUCCESS;
	}
	else
	{
	    /* If a request was returned, then we need to block until the
	       request is complete */
	    MPIR_Wait(request_ptr);
	
	    mpi_errno = request_ptr->status.MPI_ERROR;
	    MPID_Request_release(request_ptr);
		
	    if (mpi_errno == MPI_SUCCESS)
	    {
		MPID_MPI_PT2PT_FUNC_EXIT(MPID_STATE_MPI_SSEND);
		return MPI_SUCCESS;
	    }
	}
    }
    
    /* ... end of body of routine ... */
    
    MPID_MPI_PT2PT_FUNC_EXIT(MPID_STATE_MPI_SSEND);
    return MPIR_Err_return_comm( comm_ptr, FCNAME, mpi_errno );
}