brdcst.c

来自「spice中支持多层次元件模型仿真的可单独运行的插件源码」· C语言 代码 · 共 70 行

/* $Header: /home/harrison/c/tcgmsg/ipcv4.0/RCS/brdcst.c,v 1.1 91/12/06 17:26:09 harrison Exp Locker: harrison $ */

#include "sndrcv.h"

#include <stdio.h>
#include "sndrcvP.h"

void BRDCST_(type, buf, lenbuf, originator)
     long *type;
     char *buf;
     long *lenbuf;
     long *originator;
/*
  broadcast buffer to all other processes from process originator
  ... all processes call this routine specifying the same
  orginating process.

  Optimized for communicating clusters of processes ... broadcast
  amoung cluster masters, and then amoung slaves in a cluster.
*/
{
  long me = NODEID_();
  long master = SR_clus_info[SR_clus_id].masterid;
  long nslave = SR_clus_info[SR_clus_id].nslave;
  long slaveid = me - master;
  long synch = 1;
  long lenmes, from, up, left, right;

  /* Process zero is at the top of the broadcast tree */

  if ((me == *originator) && (me != 0)) {
    long zero = 0;
    SND_(type, buf, lenbuf, &zero, &synch);
  }
  else if ((*originator != 0) && (me == 0)) {
    RCV_(type, buf, lenbuf, &lenmes, originator, &from, &synch);
  }

  /* Broadcast amoung cluster masters */

  if (me == master) {
    up    = (SR_clus_id-1)/2;
    left  = 2*SR_clus_id + 1;
    right = 2*SR_clus_id + 2;
    up = SR_clus_info[up].masterid;
    left = (left < SR_n_clus) ? SR_clus_info[left].masterid : -1;
    right = (right < SR_n_clus) ? SR_clus_info[right].masterid : -1;
  
    if (me != 0)
      RCV_(type, buf, lenbuf, &lenmes, &up, &from, &synch);
    if (left > 0)
      SND_(type, buf, lenbuf, &left, &synch);
    if (right > 0)
      SND_(type, buf, lenbuf, &right, &synch);
  }

  /* Broadcast amoung local slaves */

  up    = master + (slaveid-1)/2;
  left  = master + 2*slaveid + 1;
  right = master + 2*slaveid + 2;

  if (me != master)
    RCV_(type, buf, lenbuf, &lenmes, &up, &from, &synch);
  if (left < (master+nslave))
    SND_(type, buf, lenbuf, &left, &synch);
  if (right < (master+nslave))
    SND_(type, buf, lenbuf, &right, &synch);
}