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/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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|
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/* |
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* Routines for local rtrace execution |
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*/ |
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|
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#include "rholo.h" |
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#include "random.h" |
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#include <signal.h> |
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#include <sys/time.h> |
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|
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#ifndef MAXPROC |
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#define MAXPROC 16 |
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#endif |
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|
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static char PFILE[] = "/usr/tmp/RHpersist"; /* persist file name */ |
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|
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static int rtpd[MAXPROC][3]; /* process descriptors */ |
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static float *rtbuf = NULL; /* allocated i/o buffer */ |
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static int maxqlen = 0; /* maximum packets per queue */ |
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static int nprocs = 0; /* number of processes */ |
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|
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static PACKET *pqueue[MAXPROC]; /* packet queues */ |
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static int pqlen[MAXPROC]; /* packet queue lengths */ |
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|
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|
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int |
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start_rtrace() /* start rtrace process */ |
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{ |
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static char buf1[8]; |
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int rmaxpack = 0; |
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int psiz, npt, n; |
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/* get number of processes */ |
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if ((npt = ncprocs) <= 0) |
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return(0); |
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if (npt > MAXPROC) { |
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sprintf(errmsg, |
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"number of rtrace processes reduced from %d to %d", |
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npt, MAXPROC); |
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error(WARNING, errmsg); |
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npt = MAXPROC; |
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} |
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/* add compulsory options */ |
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rtargv[rtargc++] = "-i-"; |
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rtargv[rtargc++] = "-I-"; |
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rtargv[rtargc++] = "-h-"; |
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rtargv[rtargc++] = "-ld-"; |
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sprintf(buf1, "%d", RPACKSIZ); |
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rtargv[rtargc++] = "-x"; rtargv[rtargc++] = buf1; |
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rtargv[rtargc++] = "-y"; rtargv[rtargc++] = "0"; |
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rtargv[rtargc++] = "-fff"; |
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rtargv[rtargc++] = "-ovl"; |
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rtargv[rtargc++] = nowarn ? "-w-" : "-w+"; |
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if (npt > 1) { |
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rtargv[rtargc++] = "-PP"; rtargv[rtargc++] = PFILE; |
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} |
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rtargv[rtargc++] = vval(OCTREE); |
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rtargv[rtargc] = NULL; |
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maxqlen = 0; |
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for (nprocs = 0; nprocs < npt; nprocs++) { /* spawn children */ |
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psiz = open_process(rtpd[nprocs], rtargv); |
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if (psiz <= 0) |
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error(SYSTEM, "cannot start rtrace process"); |
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n = psiz/(RPACKSIZ*6*sizeof(float)); |
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if (maxqlen == 0) { |
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if (!(maxqlen = n)) |
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error(INTERNAL, |
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"bad pipe buffer size assumption"); |
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} else if (n != maxqlen) |
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error(INTERNAL, "varying pipe buffer size!"); |
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rmaxpack += n; |
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} |
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rtbuf = (float *)malloc(RPACKSIZ*6*sizeof(float)*maxqlen); |
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if (rtbuf == NULL) |
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error(SYSTEM, "malloc failure in start_rtrace"); |
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return(rmaxpack); |
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} |
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|
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|
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static int |
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bestout() /* get best process to process packet */ |
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{ |
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int cnt; |
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register int pn, i; |
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|
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pn = 0; /* find shortest queue */ |
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for (i = 1; i < nprocs; i++) |
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if (pqlen[i] < pqlen[pn]) |
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pn = i; |
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/* sanity check */ |
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if (pqlen[pn] == maxqlen) |
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return(-1); |
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cnt = 0; /* count number of ties */ |
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for (i = pn; i < nprocs; i++) |
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if (pqlen[i] == pqlen[pn]) |
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cnt++; |
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/* break ties fairly */ |
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if ((cnt = random() % cnt)) |
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for (i = pn; i < nprocs; i++) |
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if (pqlen[i] == pqlen[pn] && !cnt--) |
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return(i); |
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return(pn); |
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} |
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|
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|
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int |
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slots_avail() /* count packet slots available */ |
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{ |
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register int nslots = 0; |
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register int i; |
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|
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for (i = nprocs; i--; ) |
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nslots += maxqlen - pqlen[i]; |
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return(nslots); |
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} |
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|
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|
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queue_packet(p) /* queue up a beam packet */ |
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register PACKET *p; |
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{ |
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int pn, n; |
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/* determine process to write to */ |
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if ((pn = bestout()) < 0) |
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error(INTERNAL, "rtrace input queues are full!"); |
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/* write out the packet */ |
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packrays(rtbuf, p); |
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if ((n = p->nr) < RPACKSIZ) /* add flush block? */ |
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bzero((char *)(rtbuf+6*n++), 6*sizeof(float)); |
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if (writebuf(rtpd[pn][1], (char *)rtbuf, 6*sizeof(float)*n) < 0) |
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error(SYSTEM, "write error in queue_packet"); |
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p->next = NULL; |
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if (!pqlen[pn]++) /* add it to the end of the queue */ |
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pqueue[pn] = p; |
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else { |
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register PACKET *rpl = pqueue[pn]; |
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while (rpl->next != NULL) |
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rpl = rpl->next; |
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rpl->next = p; |
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} |
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} |
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|
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|
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PACKET * |
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get_packets(poll) /* read packets from rtrace processes */ |
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int poll; |
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{ |
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static struct timeval tpoll; /* zero timeval struct */ |
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fd_set readset, errset; |
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PACKET *pldone = NULL, *plend; |
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register PACKET *p; |
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int n, nr; |
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register int pn; |
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float *bp; |
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/* prepare select call */ |
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FD_ZERO(&readset); FD_ZERO(&errset); n = 0; |
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for (pn = nprocs; pn--; ) { |
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if (pqlen[pn]) |
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FD_SET(rtpd[pn][0], &readset); |
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FD_SET(rtpd[pn][0], &errset); |
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if (rtpd[pn][0] >= n) |
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n = rtpd[pn][0] + 1; |
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} |
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/* make the call */ |
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n = select(n, &readset, (fd_set *)NULL, &errset, |
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poll ? &tpoll : (struct timeval *)NULL); |
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if (n < 0) { |
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if (errno == EINTR) /* interrupted select call */ |
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return(NULL); |
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error(SYSTEM, "select call failure in get_packets"); |
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} |
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if (n == 0) /* is nothing ready? */ |
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return(NULL); |
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/* make read call(s) */ |
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for (pn = 0; pn < nprocs; pn++) { |
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if (!FD_ISSET(rtpd[pn][0], &readset) && |
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!FD_ISSET(rtpd[pn][0], &errset)) |
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continue; |
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reread: |
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n = read(rtpd[pn][0], (char *)rtbuf, |
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4*sizeof(float)*RPACKSIZ*pqlen[pn]); |
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if (n < 0) { |
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if (errno == EINTR | errno == EAGAIN) |
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goto reread; |
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error(SYSTEM, "read error in get_packets"); |
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} |
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if (n == 0) |
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goto eoferr; |
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bp = rtbuf; /* finish processing */ |
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for (p = pqueue[pn]; n && p != NULL; p = p->next) { |
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if ((nr = p->nr) < RPACKSIZ) |
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nr++; /* add flush block */ |
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n -= 4*sizeof(float)*nr; |
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if (n < 0) { /* get remainder */ |
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n += readbuf(rtpd[pn][0], |
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(char *)(bp+4*nr)+n, -n); |
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if (n) |
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goto eoferr; |
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} |
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donerays(p, bp); |
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bp += 4*nr; |
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pqlen[pn]--; |
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} |
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if (n) /* read past end? */ |
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error(INTERNAL, "packet sync error in get_packets"); |
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/* take from queue */ |
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if (pldone == NULL) |
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pldone = plend = pqueue[pn]; |
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else |
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plend->next = pqueue[pn]; |
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while (plend->next != p) |
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plend = plend->next; |
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plend->next = NULL; |
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pqueue[pn] = p; |
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} |
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return(pldone); /* return finished packets */ |
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eoferr: |
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error(USER, "unexpected EOF from rtrace process"); |
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} |
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|
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|
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PACKET * |
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do_packets(pl) /* queue a packet list, return finished */ |
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register PACKET *pl; |
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{ |
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register PACKET *p; |
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/* consistency check */ |
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if (nprocs < 1) |
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error(CONSISTENCY, "do_packets called with no active process"); |
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/* queue each new packet */ |
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while (pl != NULL) { |
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p = pl; pl = p->next; p->next = NULL; |
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queue_packet(p); |
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} |
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return(get_packets(slots_avail())); /* return processed packets */ |
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} |
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|
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|
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PACKET * |
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flush_queue() /* empty all rtrace queues */ |
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{ |
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PACKET *rpdone = NULL; |
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register PACKET *rpl; |
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float *bp; |
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register PACKET *p; |
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int i, n, nr; |
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|
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for (i = 0; i < nprocs; i++) |
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if (pqlen[i]) { |
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if (rpdone == NULL) { /* tack on queue */ |
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rpdone = rpl = pqueue[i]; |
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nr = rpl->nr; |
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} else { |
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rpl->next = pqueue[i]; |
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nr = 0; |
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} |
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while (rpl->next != NULL) { |
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nr += (rpl = rpl->next)->nr; |
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if (rpl->nr < RPACKSIZ) |
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nr++; /* add flush block */ |
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} |
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n = readbuf(rtpd[i][0], (char *)rtbuf, |
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4*sizeof(float)*nr); |
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if (n < 0) |
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error(SYSTEM, "read failure in flush_queue"); |
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bp = rtbuf; /* process packets */ |
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for (p = pqueue[i]; p != NULL; p = p->next) { |
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if ((nr = p->nr) < RPACKSIZ) |
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nr++; /* add flush block */ |
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n -= 4*sizeof(float)*nr; |
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if (n >= 0) |
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donerays(p, bp); |
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else |
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p->nr = 0; /* short data error */ |
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bp += 4*nr; |
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} |
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pqueue[i] = NULL; /* zero this queue */ |
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pqlen[i] = 0; |
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} |
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return(rpdone); /* return all packets completed */ |
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} |
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|
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|
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static |
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killpersist() /* kill persistent process */ |
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{ |
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FILE *fp; |
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int pid; |
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|
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if ((fp = fopen(PFILE, "r")) == NULL) |
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return; |
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if (fscanf(fp, "%*s %d", &pid) != 1 || kill(pid, SIGALRM) < 0) |
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unlink(PFILE); |
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fclose(fp); |
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} |
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|
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|
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int |
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end_rtrace() /* close rtrace process(es) */ |
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{ |
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int status = 0, rv; |
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|
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if (nprocs > 1) |
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killpersist(); |
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while (nprocs > 0) { |
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rv = close_process(rtpd[--nprocs]); |
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if (rv > 0) |
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status = rv; |
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} |
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free((char *)rtbuf); |
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rtbuf = NULL; |
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maxqlen = 0; |
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return(status); |
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} |
