sendrecv.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_Sendrecv */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_Sendrecv = PMPI_Sendrecv
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_Sendrecv  MPI_Sendrecv
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_Sendrecv as PMPI_Sendrecv
#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_Sendrecv PMPI_Sendrecv

#endif

#undef FUNCNAME
#define FUNCNAME MPI_Sendrecv

/*@
    MPI_Sendrecv - Sends and receives a message

Input Parameters:
+ sendbuf - initial address of send buffer (choice) 
. sendcount - number of elements in send buffer (integer) 
. sendtype - type of elements in send buffer (handle) 
. dest - rank of destination (integer) 
. sendtag - send tag (integer) 
. recvcount - number of elements in receive buffer (integer) 
. recvtype - type of elements in receive buffer (handle) 
. source - rank of source (integer) 
. recvtag - receive tag (integer) 
- comm - communicator (handle) 

Output Parameters:
+ recvbuf - initial address of receive buffer (choice) 
- status - status object (Status).  This refers to the receive operation.
  
.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_Sendrecv(void *sendbuf, int sendcount, MPI_Datatype sendtype, int dest, int sendtag,
		 void *recvbuf, int recvcount, MPI_Datatype recvtype, int source, int recvtag,
		 MPI_Comm comm, MPI_Status *status)
{
    static const char FCNAME[] = "MPI_Sendrecv";
    int mpi_errno = MPI_SUCCESS;
    MPID_Comm *comm_ptr = NULL;
    MPID_Request * sreq;
    MPID_Request * rreq;
    MPID_MPI_STATE_DECL(MPID_STATE_MPI_SENDRECV);
    
    /* Verify that MPI has been initialized */
#   ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
	    MPIR_ERRTEST_INITIALIZED(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_BOTH(MPID_STATE_MPI_SENDRECV);
    
    /* Convert handles to MPI objects. */
    MPID_Comm_get_ptr( comm, comm_ptr );
    
#   ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
	    MPID_Datatype * sendtype_ptr = NULL;
	    MPID_Datatype * recvtype_ptr = NULL;
	    
	    /* Validate communicator */
            MPID_Comm_valid_ptr( comm_ptr, mpi_errno );
            if (mpi_errno) {
		goto fn_exit;
            }
	    
            /* Validate datatypes */
	    MPID_Datatype_get_ptr(sendtype, sendtype_ptr);
	    MPID_Datatype_get_ptr(recvtype, recvtype_ptr);
            MPID_Datatype_valid_ptr( sendtype_ptr, mpi_errno );
            MPID_Datatype_valid_ptr( recvtype_ptr, mpi_errno );
	    MPIR_ERRTEST_USERBUFFER(sendbuf,sendcount,sendtype,mpi_errno);
	    MPIR_ERRTEST_USERBUFFER(recvbuf,recvcount,recvtype,mpi_errno);
	    
	    /* Validate count */
	    MPIR_ERRTEST_COUNT(sendcount,mpi_errno);
	    MPIR_ERRTEST_COUNT(recvcount,mpi_errno);

	    /* Validate status (status_ignore is not the same as null) */
	    MPIR_ERRTEST_ARGNULL( status, "status", mpi_errno );

	    /* Validate tags */
	    MPIR_ERRTEST_SEND_TAG(sendtag,mpi_errno );
	    MPIR_ERRTEST_RECV_TAG(recvtag,mpi_errno );

	    /* Validate source and destination */
	    if (comm_ptr) {
		MPIR_ERRTEST_SEND_RANK(comm_ptr, dest, mpi_errno );
		MPIR_ERRTEST_RECV_RANK(comm_ptr, source, mpi_errno );
	    }
            if (mpi_errno) {
		goto fn_exit;
            }
        }
        MPID_END_ERROR_CHECKS;
    }
#   endif /* HAVE_ERROR_CHECKING */

    mpi_errno = MPID_Irecv(recvbuf, recvcount, recvtype, source, recvtag, comm_ptr, MPID_CONTEXT_INTRA_PT2PT, &rreq);
    if (mpi_errno)
    {
	goto fn_exit;
    }

    /* FIXME - Performance for small messages might be better if MPID_Send() were used here instead of MPID_Isend() */
    mpi_errno = MPID_Isend(sendbuf, sendcount, sendtype, dest, sendtag, comm_ptr, MPID_CONTEXT_INTRA_PT2PT, &sreq);
    if (mpi_errno)
    {
	/* FIXME: should we cancel the pending (possibly completed) receive request or wait for it to complete? */
	MPID_Request_release(rreq);
	goto fn_exit;
    }

    while(1)
    {
	MPID_Progress_start();
	
	if (*sreq->cc_ptr != 0 || *rreq->cc_ptr != 0)
	{
	    MPID_Progress_wait();
	}
	else
	{
	    MPID_Progress_end();
	    break;
	}
    }

    if (status != MPI_STATUS_IGNORE)
    {
	*status = rreq->status;
    }

    if (mpi_errno == MPI_SUCCESS)
    {
	mpi_errno = rreq->status.MPI_ERROR;
    }
    
    if (mpi_errno == MPI_SUCCESS)
    {
	mpi_errno = sreq->status.MPI_ERROR;
    }
    
    MPID_Request_release(sreq);
    MPID_Request_release(rreq);

  fn_exit:
    MPID_MPI_PT2PT_FUNC_EXIT(MPID_STATE_MPI_SENDRECV);
    return (mpi_errno == MPI_SUCCESS) ? MPI_SUCCESS : MPIR_Err_return_comm( comm_ptr, FCNAME, mpi_errno );
}