ch3_istartmsg.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 "mpidi_ch3_impl.h"

/*static MPID_Request * create_request(void * pkt, MPIDI_msg_sz_t pkt_sz, int nb)*/
#undef create_request
#define create_request(sreq, pkt, pkt_sz, nb) \
{ \
    /*MPID_Request * sreq;*/ \
    MPIDI_STATE_DECL(MPID_STATE_CREATE_REQUEST); \
    MPIDI_FUNC_ENTER(MPID_STATE_CREATE_REQUEST); \
    sreq = MPIDI_CH3_Request_create(); \
    /*if (sreq == NULL) return NULL;*/ \
    if (sreq == NULL) \
    { \
	mpi_errno = MPIR_Err_create_code(MPI_SUCCESS, MPIR_ERR_FATAL, FCNAME, __LINE__, MPI_ERR_OTHER, "**nomem", 0); \
	MPIDI_FUNC_EXIT(MPID_STATE_CREATE_REQUEST); \
	MPIDI_FUNC_EXIT(MPID_STATE_MPIDI_CH3_ISTARTMSG); \
	return mpi_errno; \
    } \
    MPIU_Object_set_ref(sreq, 2); \
    sreq->kind = MPID_REQUEST_SEND; \
    /*MPIU_Assert(pkt_sz == sizeof(MPIDI_CH3_Pkt_t));*/ \
    sreq->ch.pkt = *(MPIDI_CH3_Pkt_t *) pkt; \
    sreq->dev.iov[0].MPID_IOV_BUF = (MPID_IOV_BUF_CAST)((char *) &sreq->ch.pkt + nb); \
    sreq->dev.iov[0].MPID_IOV_LEN = pkt_sz - nb; \
    sreq->dev.iov_count = 1; \
    sreq->ch.iov_offset = 0; \
    sreq->dev.ca = MPIDI_CH3_CA_COMPLETE; \
    MPIDI_FUNC_EXIT(MPID_STATE_CREATE_REQUEST); \
    /*return sreq;*/ \
}

/*
 * MPIDI_CH3_iStartMsg() attempts to send the message immediately.  If the entire message is successfully sent, then NULL is
 * returned.  Otherwise a request is allocated, the header is copied into the request, and a pointer to the request is returned.
 * An error condition also results in a request be allocated and the errror being returned in the status field of the request.
 */
#undef FUNCNAME
#define FUNCNAME MPIDI_CH3_iStartMsg
#undef FCNAME
#define FCNAME MPIDI_QUOTE(FUNCNAME)
int MPIDI_CH3_iStartMsg(MPIDI_VC_t * vc, void * pkt, MPIDI_msg_sz_t pkt_sz, MPID_Request **sreq_ptr)
{
    int mpi_errno = MPI_SUCCESS;
    MPID_Request * sreq = NULL;
    MPIDI_STATE_DECL(MPID_STATE_MPIDI_CH3_ISTARTMSG);

    MPIDI_FUNC_ENTER(MPID_STATE_MPIDI_CH3_ISTARTMSG);
    
    MPIDI_DBG_PRINTF((50, FCNAME, "entering"));
#ifdef MPICH_DBG_OUTPUT
    if (pkt_sz > sizeof(MPIDI_CH3_Pkt_t))
    {
	mpi_errno = MPIR_Err_create_code(MPI_SUCCESS, MPIR_ERR_FATAL, FCNAME, __LINE__, MPI_ERR_OTHER, "**arg", 0);
	goto fn_exit;
    }
#endif

    /* The MM channel uses a fixed length header, the size of which is the maximum of all possible packet headers */
    pkt_sz = sizeof(MPIDI_CH3_Pkt_t);
    MPIDI_DBG_Print_packet((MPIDI_CH3_Pkt_t*)pkt);
    
    if (vc->ch.state == MPIDI_CH3I_VC_STATE_CONNECTED) /* MT */
    {
	/* Connection already formed.  If send queue is empty attempt to send data, queuing any unsent data. */
	if (MPIDI_CH3I_SendQ_empty(vc)) /* MT */
	{
	    int nb;

	    MPIDI_DBG_PRINTF((55, FCNAME, "send queue empty, attempting to write"));

	    /* MT - need some signalling to lock down our right to use the channel, thus insuring that the progress engine does
               not also try to write */

	    mpi_errno = MPIDI_CH3I_SHM_write(vc, pkt, pkt_sz, &nb);
	    if (mpi_errno == MPI_SUCCESS)
	    {
		MPIDI_DBG_PRINTF((55, FCNAME, "wrote %d bytes", nb));

		if (nb == pkt_sz)
		{ 
		    MPIDI_DBG_PRINTF((55, FCNAME, "entire write complete, %d bytes", nb));
		    /* done.  get us out of here as quickly as possible. */
		}
		else
		{
		    MPIDI_DBG_PRINTF((55, FCNAME, "partial write of %d bytes, request enqueued at head", nb));
		    create_request(sreq, pkt, pkt_sz, nb);
		    /*sreq = create_request(pkt, pkt_sz, nb);
		    if (sreq == NULL)
		    {
		    mpi_errno = MPIR_Err_create_code(MPI_SUCCESS, MPIR_ERR_FATAL, FCNAME, __LINE__, MPI_ERR_OTHER, "**nomem", 0);
		    MPIDI_FUNC_EXIT(MPID_STATE_MPIDI_CH3_ISTARTMSG);
		    return mpi_errno;
		    }
		    */
		    MPIDI_CH3I_SendQ_enqueue_head(vc, sreq);
		    vc->ch.send_active = sreq;
		}
	    }
	    else
	    {
		sreq = MPIDI_CH3_Request_create();
		if (sreq == NULL)
		{
		    mpi_errno = MPIR_Err_create_code(MPI_SUCCESS, MPIR_ERR_FATAL, FCNAME, __LINE__, MPI_ERR_OTHER, "**nomem", 0);
		    goto fn_exit;
		}
		sreq->kind = MPID_REQUEST_SEND;
		sreq->cc = 0;
		/* TODO: Create an appropriate error message based on the return value */
		sreq->status.MPI_ERROR = MPIR_Err_create_code(mpi_errno, MPIR_ERR_FATAL, FCNAME, __LINE__, MPI_ERR_OTHER, "**ssmwrite", 0);
	    }
	}
	else
	{
	    MPIDI_DBG_PRINTF((55, FCNAME, "send in progress, request enqueued"));
	    create_request(sreq, pkt, pkt_sz, 0);
	    /*sreq = create_request(pkt, pkt_sz, 0);
	    if (sreq == NULL)
	    {
		mpi_errno = MPIR_Err_create_code(MPI_SUCCESS, MPIR_ERR_FATAL, FCNAME, __LINE__, MPI_ERR_OTHER, "**nomem", 0);
		MPIDI_FUNC_EXIT(MPID_STATE_MPIDI_CH3_ISTARTMSG);
		return mpi_errno;
	    }
	    */
	    MPIDI_CH3I_SendQ_enqueue(vc, sreq);
	}
    }
    else if (vc->ch.state == MPIDI_CH3I_VC_STATE_UNCONNECTED) /* MT */
    {
	MPIDI_DBG_PRINTF((55, FCNAME, "unconnected.  posting connect and enqueuing request"));

	/* queue the data so it can be sent after the connection is formed */
	create_request(sreq, pkt, pkt_sz, 0);
	/*sreq = create_request(pkt, pkt_sz, 0);
	if (sreq == NULL)
	{
	    mpi_errno = MPIR_Err_create_code(MPI_SUCCESS, MPIR_ERR_FATAL, FCNAME, __LINE__, MPI_ERR_OTHER, "**nomem", 0);
	    MPIDI_FUNC_EXIT(MPID_STATE_MPIDI_CH3_ISTARTMSG);
	    return mpi_errno;
	}
	*/
	MPIDI_CH3I_SendQ_enqueue(vc, sreq);

	MPIDI_CH3I_VC_post_connect(vc);
    }
    else if (vc->ch.state != MPIDI_CH3I_VC_STATE_FAILED)
    {
	/* Unable to send data at the moment, so queue it for later */
	MPIDI_DBG_PRINTF((55, FCNAME, "forming connection, request enqueued"));
	create_request(sreq, pkt, pkt_sz, 0);
	/*sreq = create_request(pkt, pkt_sz, 0);
	if (sreq == NULL)
	{
	    mpi_errno = MPIR_Err_create_code(MPI_SUCCESS, MPIR_ERR_FATAL, FCNAME, __LINE__, MPI_ERR_OTHER, "**nomem", 0);
	    MPIDI_FUNC_EXIT(MPID_STATE_MPIDI_CH3_ISTARTMSG);
	    return mpi_errno;
	}
	*/
	MPIDI_CH3I_SendQ_enqueue(vc, sreq);
    }
    else
    {
	/* Connection failed, so allocate a request and return an error. */
	MPIDI_DBG_PRINTF((55, FCNAME, "ERROR - connection failed"));
	sreq = MPIDI_CH3_Request_create();
	if (sreq == NULL)
	{
	    mpi_errno = MPIR_Err_create_code(MPI_SUCCESS, MPIR_ERR_FATAL, FCNAME, __LINE__, MPI_ERR_OTHER, "**nomem", 0);
	    goto fn_exit;
	}
	sreq->kind = MPID_REQUEST_SEND;
	sreq->cc = 0;
	/* TODO: Create an appropriate error message */
	sreq->status.MPI_ERROR = MPIR_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE, FCNAME, __LINE__, MPI_ERR_INTERN, "**connfailed", 0);
    }

fn_exit:
    *sreq_ptr = sreq;

    MPIDI_DBG_PRINTF((50, FCNAME, "exiting"));
    MPIDI_FUNC_EXIT(MPID_STATE_MPIDI_CH3_ISTARTMSG);
    return mpi_errno;
}