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#include "rholo.h" |
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#ifndef NFRAG2CHUNK |
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#define NFRAG2CHUNK 4096 /* number of fragments to start chunking */ |
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#endif |
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|
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#ifndef abs |
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#define abs(x) ((x) > 0 ? (x) : -(x)) |
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#endif |
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#ifndef sgn |
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#define sgn(x) ((x) > 0 ? 1 : (x) < 0 ? -1 : 0) |
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#endif |
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|
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#define rchunk(n) (((n)+(RPACKSIZ/2))/RPACKSIZ) |
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|
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static PACKHEAD *complist=NULL; /* list of beams to compute */ |
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static int complen=0; /* length of complist */ |
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static int listpos=0; /* current list position for next_packet */ |
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static int lastin= -1; /* last ordered position in list */ |
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static int chunky=0; /* clump beams together on disk */ |
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int |
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beamcmp(b0, b1) /* comparison for compute order */ |
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register PACKHEAD *b0, *b1; |
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{ |
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return( b1->nr*(b0->nc+1) - b0->nr*(b1->nc+1) ); |
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BEAMI *bip0, *bip1; |
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register long c; |
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/* first check desired quantities */ |
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if (chunky) |
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c = rchunk(b1->nr)*(rchunk(b0->nc)+1) - |
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rchunk(b0->nr)*(rchunk(b1->nc)+1); |
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else |
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c = b1->nr*(b0->nc+1) - b0->nr*(b1->nc+1); |
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if (c) return(c); |
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/* only one file, so skip the following: */ |
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#if 0 |
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/* next, check file descriptors */ |
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c = hdlist[b0->hd]->fd - hdlist[b1->hd]->fd; |
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if (c) return(c); |
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#endif |
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/* finally, check file positions */ |
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bip0 = &hdlist[b0->hd]->bi[b0->bi]; |
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bip1 = &hdlist[b1->hd]->bi[b1->bi]; |
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/* put diskless beams last */ |
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if (!bip0->nrd) |
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return(bip1->nrd > 0); |
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if (!bip1->nrd) |
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return(-1); |
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c = bip0->fo - bip1->fo; |
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return(c < 0 ? -1 : c > 0); |
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} |
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default: |
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error(CONSISTENCY, "bundle_set called with unknown operation"); |
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} |
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if (outdev == NULL) /* nothing to display? */ |
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if (outdev == NULL || !nents) /* nothing to display? */ |
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return; |
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/* load and display beams we have */ |
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hbarr = (HDBEAMI *)malloc(nents*sizeof(HDBEAMI)); |
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} |
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hdloadbeams(hbarr, nents, dispbeam); |
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free((char *)hbarr); |
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if (hdfragflags&FF_READ) { |
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listpos = 0; |
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lastin = -1; /* need to re-sort list */ |
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} |
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return; |
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memerr: |
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error(SYSTEM, "out of memory in bundle_set"); |
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sortcomplist() /* fix our list order */ |
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{ |
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PACKHEAD *list2; |
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int listlen; |
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register int i; |
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|
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if (complen <= 0) /* check to see if there is even a list */ |
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return; |
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if (!chunky) /* check to see if fragment list is full */ |
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if (!hdfragOK(hdlist[0]->fd, &listlen, NULL) |
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#if NFRAG2CHUNK |
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|| listlen >= NFRAG2CHUNK |
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#endif |
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) { |
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#ifdef DEBUG |
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error(WARNING, "using chunky comparison mode"); |
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#endif |
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chunky++; /* use "chunky" comparison */ |
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lastin = -1; /* need to re-sort list */ |
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} |
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if (lastin < 0 || listpos*4 >= complen*3) |
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qsort((char *)complist, complen, sizeof(PACKHEAD), beamcmp); |
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else if (listpos) { /* else sort and merge sublist */ |
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* more or less evenly distributed, such that computing a packet causes |
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* a given bundle to move way down in the computation order. We keep |
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* track of where the computed bundle with the highest priority would end |
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* up, and if we get further in our compute list than this, we resort the |
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* up, and if we get further in our compute list than this, we re-sort the |
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* list and start again from the beginning. Since |
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* a merge sort is used, the sorting costs are minimal. |
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*/ |
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if (p->nr > n) |
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p->nr = n; |
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complist[listpos].nc += p->nr; /* find where this one would go */ |
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if (hdgetbeam(hdlist[p->hd], p->bi) != NULL) |
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hdfreefrag(hdlist[p->hd], p->bi); |
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while (lastin > listpos && |
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beamcmp(complist+lastin, complist+listpos) > 0) |
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lastin--; |
