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gregl |
3.1 |
/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
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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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* Routines for managing holodeck files |
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* |
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* 9/30/97 GWLarson |
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*/ |
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#include "holo.h" |
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#ifndef CACHESIZE |
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#define CACHESIZE 16 /* default cache size (Mbytes, 0==inf) */ |
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#endif |
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#ifndef FREEBEAMS |
19 |
gregl |
3.5 |
#define FREEBEAMS 512 /* maximum beams to free at a time */ |
20 |
gregl |
3.1 |
#endif |
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#ifndef PCTFREE |
22 |
gregl |
3.5 |
#define PCTFREE 20 /* maximum fraction to free (%) */ |
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gregl |
3.1 |
#endif |
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25 |
gregl |
3.7 |
/* define MAXFRAG if you want to limit fragment tracking memory */ |
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gregl |
3.6 |
#ifndef BSD |
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#define write writebuf /* safe i/o routines */ |
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#define read readbuf |
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#endif |
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gregl |
3.4 |
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#define FRAGBLK 64 /* number of fragments to allocate at a time */ |
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gregl |
3.14 |
unsigned hdcachesize = CACHESIZE*1024*1024; /* target cache size */ |
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gregl |
3.1 |
unsigned long hdclock; /* clock value */ |
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HOLO *hdlist[HDMAX+1]; /* holodeck pointers (NULL term.) */ |
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static struct fragment { |
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short nlinks; /* number of holodeck sections using us */ |
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gregl |
3.13 |
short writerr; /* write error encountered */ |
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int nfrags; /* number of known fragments */ |
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gregl |
3.4 |
BEAMI *fi; /* fragments, descending file position */ |
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gregl |
3.1 |
long flen; /* last known file length */ |
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gregl |
3.4 |
} *hdfrag; /* fragment lists, indexed by file descriptor */ |
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gregl |
3.1 |
|
47 |
gregl |
3.4 |
static int nhdfrags; /* size of hdfrag array */ |
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gregl |
3.1 |
|
49 |
gregl |
3.4 |
|
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gregl |
3.1 |
hdattach(fd) /* start tracking file fragments for some section */ |
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register int fd; |
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{ |
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gregl |
3.4 |
if (fd >= nhdfrags) { |
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if (nhdfrags) |
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hdfrag = (struct fragment *)realloc((char *)hdfrag, |
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(fd+1)*sizeof(struct fragment)); |
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else |
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hdfrag = (struct fragment *)malloc( |
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(fd+1)*sizeof(struct fragment)); |
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if (hdfrag == NULL) |
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error(SYSTEM, "out of memory in hdattach"); |
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bzero((char *)(hdfrag+nhdfrags), |
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(fd+1-nhdfrags)*sizeof(struct fragment)); |
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nhdfrags = fd+1; |
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gregl |
3.1 |
} |
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gregl |
3.4 |
hdfrag[fd].nlinks++; |
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hdfrag[fd].flen = lseek(fd, 0L, 2); /* get file length */ |
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gregl |
3.1 |
} |
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/* Do we need a routine to locate file fragments given known occupants? */ |
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hdrelease(fd) /* stop tracking file fragments for some section */ |
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register int fd; |
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{ |
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gregl |
3.8 |
if (fd < 0 | fd >= nhdfrags || !hdfrag[fd].nlinks) |
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gregl |
3.1 |
return; |
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gregl |
3.4 |
if (!--hdfrag[fd].nlinks && hdfrag[fd].nfrags) { |
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free((char *)hdfrag[fd].fi); |
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hdfrag[fd].fi = NULL; |
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hdfrag[fd].nfrags = 0; |
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gregl |
3.1 |
} |
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} |
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gregl |
3.6 |
markdirty(hp) /* mark holodeck section directory dirty */ |
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register HOLO *hp; |
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{ |
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static BEAMI smudge = {0, -1}; |
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if (hp->dirty) /* already marked? */ |
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return; |
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hp->dirty = 1; |
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if (lseek(hp->fd, biglob(hp)->fo+(nbeams(hp)-1)*sizeof(BEAMI), 0) < 0 |
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|| write(hp->fd, (char *)&smudge, |
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sizeof(BEAMI)) != sizeof(BEAMI)) |
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error(SYSTEM, "seek/write error in markdirty"); |
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} |
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gregl |
3.1 |
HOLO * |
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hdinit(fd, hproto) /* initialize a holodeck section in a file */ |
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int fd; /* corresponding file descriptor */ |
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HDGRID *hproto; /* holodeck section grid */ |
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{ |
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long fpos; |
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register HOLO *hp; |
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register int n; |
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/* prepare for system errors */ |
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errno = 0; |
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if ((fpos = lseek(fd, 0L, 1)) < 0) |
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error(SYSTEM, "cannot determine holodeck file position"); |
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if (hproto == NULL) { /* assume we're loading it */ |
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HDGRID hpr; |
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/* load header */ |
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if (read(fd, (char *)&hpr, sizeof(HDGRID)) != sizeof(HDGRID)) |
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error(SYSTEM, "cannot load holodeck header"); |
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/* allocate grid */ |
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if ((hp = hdalloc(&hpr)) == NULL) |
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goto memerr; |
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/* load beam directory */ |
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n = nbeams(hp)*sizeof(BEAMI); |
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if (read(fd, (char *)(hp->bi+1), n) != n) |
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error(SYSTEM, "failure loading holodeck directory"); |
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gregl |
3.6 |
/* check that it's clean */ |
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if (hp->bi[nbeams(hp)].fo < 0) |
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error(USER, "dirty holodeck section"); |
129 |
gregl |
3.1 |
} else { /* assume we're creating it */ |
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if ((hp = hdalloc(hproto)) == NULL) |
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goto memerr; |
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/* write header and skeleton */ |
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n = nbeams(hp)*sizeof(BEAMI); |
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if (write(fd, (char *)hproto, sizeof(HDGRID)) != |
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sizeof(HDGRID) || |
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write(fd, (char *)(hp->bi+1), n) != n) |
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error(SYSTEM, "cannot write header to holodeck file"); |
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} |
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hp->fd = fd; |
140 |
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hp->dirty = 0; |
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biglob(hp)->fo = fpos + sizeof(HDGRID); |
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gregl |
3.13 |
/* start tracking fragments */ |
143 |
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hdattach(fd); |
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/* check rays on disk */ |
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fpos = hdfilen(fd); |
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biglob(hp)->nrd = 0; |
147 |
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for (n = hproto == NULL ? nbeams(hp) : 0; n > 0; n--) |
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if (hp->bi[n].nrd) |
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if (hp->bi[n].fo + hp->bi[n].nrd > fpos) |
150 |
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hp->bi[n].nrd = 0; /* off end */ |
151 |
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else |
152 |
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biglob(hp)->nrd += hp->bi[n].nrd; |
153 |
gregl |
3.1 |
/* add to holodeck list */ |
154 |
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for (n = 0; n < HDMAX; n++) |
155 |
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if (hdlist[n] == NULL) { |
156 |
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hdlist[n] = hp; |
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break; |
158 |
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} |
159 |
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/* all done */ |
160 |
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return(hp); |
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memerr: |
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error(SYSTEM, "cannot allocate holodeck grid"); |
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} |
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165 |
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166 |
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int |
167 |
gregl |
3.12 |
hdsync(hp, all) /* update beams and directory on disk */ |
168 |
gregl |
3.1 |
register HOLO *hp; |
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gregl |
3.12 |
int all; |
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gregl |
3.1 |
{ |
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register int j, n; |
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gregl |
3.12 |
if (hp == NULL) { /* do all holodecks */ |
174 |
gregl |
3.1 |
n = 0; |
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for (j = 0; hdlist[j] != NULL; j++) |
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gregl |
3.12 |
n += hdsync(hdlist[j], all); |
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gregl |
3.1 |
return(n); |
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} |
179 |
gregl |
3.12 |
/* sync the beams */ |
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for (j = all ? nbeams(hp) : 0; j > 0; j--) |
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if (hp->bl[j] != NULL) |
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hdsyncbeam(hp, j); |
183 |
gregl |
3.13 |
if (!hp->dirty) /* directory clean? */ |
184 |
gregl |
3.1 |
return(0); |
185 |
gregl |
3.3 |
errno = 0; |
186 |
gregl |
3.1 |
if (lseek(hp->fd, biglob(hp)->fo, 0) < 0) |
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error(SYSTEM, "cannot seek on holodeck file"); |
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n = nbeams(hp)*sizeof(BEAMI); |
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if (write(hp->fd, (char *)(hp->bi+1), n) != n) |
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error(SYSTEM, "cannot update holodeck section directory"); |
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hp->dirty = 0; |
192 |
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return(1); |
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} |
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196 |
gregl |
3.14 |
unsigned |
197 |
gregl |
3.1 |
hdmemuse(all) /* return memory usage (in bytes) */ |
198 |
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int all; /* include overhead (painful) */ |
199 |
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{ |
200 |
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long total = 0; |
201 |
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register int i, j; |
202 |
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203 |
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for (j = 0; hdlist[j] != NULL; j++) { |
204 |
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total += blglob(hdlist[j])->nrm * sizeof(RAYVAL); |
205 |
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if (all) { |
206 |
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total += sizeof(HOLO) + sizeof(BEAM *) + |
207 |
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nbeams(hdlist[j]) * |
208 |
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(sizeof(BEAM *)+sizeof(BEAMI)); |
209 |
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for (i = nbeams(hdlist[j]); i > 0; i--) |
210 |
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if (hdlist[j]->bl[i] != NULL) |
211 |
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total += sizeof(BEAM); |
212 |
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} |
213 |
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} |
214 |
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if (all) |
215 |
gregl |
3.4 |
for (j = 0; j < nhdfrags; j++) { |
216 |
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total += sizeof(struct fragment); |
217 |
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if (hdfrag[j].nfrags) |
218 |
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total += FRAGBLK*sizeof(BEAMI) * |
219 |
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((hdfrag[j].nfrags-1)/FRAGBLK + 1) ; |
220 |
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} |
221 |
gregl |
3.1 |
return(total); |
222 |
gregl |
3.8 |
} |
223 |
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224 |
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225 |
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long |
226 |
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hdfilen(fd) /* return file length for fd */ |
227 |
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int fd; |
228 |
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{ |
229 |
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long fpos, flen; |
230 |
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231 |
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if (fd < 0) |
232 |
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return(-1); |
233 |
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if (fd >= nhdfrags || !hdfrag[fd].nlinks) { |
234 |
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if ((fpos = lseek(fd, 0L, 1)) < 0) |
235 |
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return(-1); |
236 |
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flen = lseek(fd, 0L, 2); |
237 |
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lseek(fd, fpos, 0); |
238 |
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return(flen); |
239 |
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} |
240 |
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return(hdfrag[fd].flen); |
241 |
gregl |
3.1 |
} |
242 |
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243 |
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244 |
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long |
245 |
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hdfiluse(fd, all) /* compute file usage (in bytes) */ |
246 |
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int fd; /* open file descriptor to check */ |
247 |
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int all; /* include overhead and unflushed data */ |
248 |
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{ |
249 |
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long total = 0; |
250 |
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register int i, j; |
251 |
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252 |
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for (j = 0; hdlist[j] != NULL; j++) { |
253 |
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if (hdlist[j]->fd != fd) |
254 |
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continue; |
255 |
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total += biglob(hdlist[j])->nrd * sizeof(RAYVAL); |
256 |
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if (all) { |
257 |
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for (i = nbeams(hdlist[j]); i > 0; i--) |
258 |
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if (hdlist[j]->bl[i] != NULL) |
259 |
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total += sizeof(RAYVAL) * |
260 |
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(hdlist[j]->bl[i]->nrm - |
261 |
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hdlist[j]->bi[i].nrd); |
262 |
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total += sizeof(HDGRID) + |
263 |
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nbeams(hdlist[j])*sizeof(BEAMI); |
264 |
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} |
265 |
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} |
266 |
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return(total); /* does not include fragments */ |
267 |
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} |
268 |
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269 |
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270 |
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RAYVAL * |
271 |
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hdnewrays(hp, i, nr) /* allocate space for add'l rays and return pointer */ |
272 |
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register HOLO *hp; |
273 |
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register int i; |
274 |
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int nr; /* number of new rays desired */ |
275 |
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{ |
276 |
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RAYVAL *p; |
277 |
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int n; |
278 |
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279 |
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if (nr <= 0) |
280 |
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return(NULL); |
281 |
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if (i < 1 | i > nbeams(hp)) |
282 |
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error(CONSISTENCY, "bad beam index given to hdnewrays"); |
283 |
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if (hp->bl[i] != NULL) |
284 |
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hp->bl[i]->tick = hdclock; /* preempt swap */ |
285 |
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if (hdcachesize > 0 && hdmemuse(0) >= hdcachesize) |
286 |
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hdfreecache(PCTFREE, NULL); /* free some space */ |
287 |
gregl |
3.3 |
errno = 0; |
288 |
gregl |
3.1 |
if (hp->bl[i] == NULL) { /* allocate (and load) */ |
289 |
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n = hp->bi[i].nrd + nr; |
290 |
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if ((hp->bl[i] = (BEAM *)malloc(hdbsiz(n))) == NULL) |
291 |
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goto memerr; |
292 |
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blglob(hp)->nrm += n; |
293 |
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if (n = hp->bl[i]->nrm = hp->bi[i].nrd) { |
294 |
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if (lseek(hp->fd, hp->bi[i].fo, 0) < 0) |
295 |
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error(SYSTEM, "seek error on holodeck file"); |
296 |
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n *= sizeof(RAYVAL); |
297 |
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if (read(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
298 |
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error(SYSTEM, |
299 |
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"error reading beam from holodeck file"); |
300 |
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} |
301 |
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} else { /* just grow in memory */ |
302 |
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hp->bl[i] = (BEAM *)realloc( (char *)hp->bl[i], |
303 |
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hdbsiz(hp->bl[i]->nrm + nr) ); |
304 |
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if (hp->bl[i] == NULL) |
305 |
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goto memerr; |
306 |
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blglob(hp)->nrm += nr; |
307 |
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} |
308 |
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p = hdbray(hp->bl[i]) + hp->bl[i]->nrm; |
309 |
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hp->bl[i]->nrm += nr; /* update in-core structure */ |
310 |
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bzero((char *)p, nr*sizeof(RAYVAL)); |
311 |
gregl |
3.14 |
hp->bl[i]->tick = hdclock; /* update LRU clock */ |
312 |
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blglob(hp)->tick = hdclock++; |
313 |
gregl |
3.1 |
return(p); /* point to new rays */ |
314 |
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memerr: |
315 |
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error(SYSTEM, "out of memory in hdnewrays"); |
316 |
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} |
317 |
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318 |
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319 |
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BEAM * |
320 |
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hdgetbeam(hp, i) /* get beam (from file if necessary) */ |
321 |
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register HOLO *hp; |
322 |
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register int i; |
323 |
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{ |
324 |
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register int n; |
325 |
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326 |
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if (i < 1 | i > nbeams(hp)) |
327 |
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error(CONSISTENCY, "bad beam index given to hdgetbeam"); |
328 |
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if (hp->bl[i] == NULL) { /* load from disk */ |
329 |
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if (!(n = hp->bi[i].nrd)) |
330 |
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return(NULL); |
331 |
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if (hdcachesize > 0 && hdmemuse(0) >= hdcachesize) |
332 |
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hdfreecache(PCTFREE, NULL); /* get free space */ |
333 |
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errno = 0; |
334 |
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if ((hp->bl[i] = (BEAM *)malloc(hdbsiz(n))) == NULL) |
335 |
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error(SYSTEM, "cannot allocate memory for beam"); |
336 |
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blglob(hp)->nrm += hp->bl[i]->nrm = n; |
337 |
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if (lseek(hp->fd, hp->bi[i].fo, 0) < 0) |
338 |
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error(SYSTEM, "seek error on holodeck file"); |
339 |
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n *= sizeof(RAYVAL); |
340 |
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if (read(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) |
341 |
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error(SYSTEM, "error reading beam from holodeck file"); |
342 |
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} |
343 |
gregl |
3.14 |
hp->bl[i]->tick = hdclock; /* update LRU clock */ |
344 |
|
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blglob(hp)->tick = hdclock++; |
345 |
gregl |
3.1 |
return(hp->bl[i]); |
346 |
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} |
347 |
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348 |
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349 |
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int |
350 |
gregl |
3.14 |
hdfilord(hb1, hb2) /* order beams for optimal loading */ |
351 |
|
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register HDBEAMI *hb1, *hb2; |
352 |
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{ |
353 |
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register int c; |
354 |
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/* sort by file descriptor first */ |
355 |
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if ((c = hb1->h->fd - hb2->h->fd)) |
356 |
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return(c); |
357 |
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/* then by position in file */ |
358 |
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return(hb1->h->bi[hb1->b].fo - hb2->h->bi[hb2->b].fo); |
359 |
|
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} |
360 |
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361 |
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362 |
|
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hdloadbeams(hb, n, bf) /* load a list of beams in optimal order */ |
363 |
|
|
register HDBEAMI *hb; /* list gets sorted by hdfilord() */ |
364 |
|
|
int n; /* list length */ |
365 |
|
|
int (*bf)(); /* callback function (optional) */ |
366 |
|
|
{ |
367 |
|
|
unsigned origcachesize, memuse; |
368 |
|
|
register BEAM *bp; |
369 |
|
|
int bytesloaded, needbytes, bytes2free; |
370 |
|
|
register int i; |
371 |
|
|
/* precheck consistency */ |
372 |
|
|
for (i = n; i--; ) |
373 |
|
|
if (hb[i].h == NULL || hb[i].b < 1 | hb[i].b > nbeams(hb[i].h)) |
374 |
|
|
error(CONSISTENCY, "bad beam in hdloadbeams"); |
375 |
|
|
/* sort list for optimal access */ |
376 |
|
|
qsort((char *)hb, n, sizeof(HDBEAMI), hdfilord); |
377 |
|
|
if ((origcachesize = hdcachesize) == 0) |
378 |
|
|
goto loadbeams; |
379 |
|
|
bytesloaded = needbytes = 0; /* figure out memory needs */ |
380 |
|
|
for (i = 0; i < n; i++) |
381 |
|
|
if ((bp = hb[i].h->bl[hb[i].b]) != NULL) { |
382 |
|
|
bp->tick = hdclock; /* preempt swap */ |
383 |
|
|
bytesloaded += bp->nrm; |
384 |
|
|
} else /* prepare to load */ |
385 |
|
|
needbytes += hb[i].h->bi[hb[i].b].nrd; |
386 |
|
|
bytesloaded *= sizeof(RAYVAL); |
387 |
|
|
needbytes *= sizeof(RAYVAL); |
388 |
|
|
do { /* free enough memory */ |
389 |
|
|
memuse = hdmemuse(0); |
390 |
|
|
bytes2free = needbytes - (signed)(hdcachesize-memuse); |
391 |
|
|
if (bytes2free > (signed)(memuse - bytesloaded)) |
392 |
|
|
bytes2free = memuse - bytesloaded; |
393 |
|
|
} while (bytes2free > 0 && |
394 |
|
|
hdfreecache(100*bytes2free/memuse, NULL) < 0); |
395 |
|
|
loadbeams: |
396 |
|
|
hdcachesize = 0; /* load the ordered beams w/o swap */ |
397 |
|
|
for (i = 0; i < n; i++) |
398 |
|
|
if ((bp = hdgetbeam(hb[i].h, hb[i].b)) != NULL && bf != NULL) |
399 |
|
|
(*bf)(bp, hb[i].h, hb[i].b); |
400 |
|
|
hdcachesize = origcachesize; /* resume dynamic swapping */ |
401 |
|
|
} |
402 |
|
|
|
403 |
|
|
|
404 |
|
|
int |
405 |
gregl |
3.12 |
hdsyncbeam(hp, i) /* sync beam in memory with beam on disk */ |
406 |
gregl |
3.1 |
register HOLO *hp; |
407 |
|
|
register int i; |
408 |
|
|
{ |
409 |
gregl |
3.12 |
unsigned int nrays; |
410 |
gregl |
3.11 |
long nfo; |
411 |
|
|
unsigned int n; |
412 |
gregl |
3.13 |
/* check file status */ |
413 |
|
|
if (hdfrag[hp->fd].writerr) |
414 |
|
|
return(-1); |
415 |
gregl |
3.12 |
#ifdef DEBUG |
416 |
|
|
if (i < 1 | i > nbeams(hp)) |
417 |
|
|
error(CONSISTENCY, "bad beam index in hdsyncbeam"); |
418 |
|
|
#endif |
419 |
gregl |
3.11 |
/* is current fragment OK? */ |
420 |
gregl |
3.12 |
if (hp->bl[i] == NULL || (nrays = hp->bl[i]->nrm) == hp->bi[i].nrd) |
421 |
gregl |
3.1 |
return(0); |
422 |
gregl |
3.13 |
/* locate fragment */ |
423 |
gregl |
3.4 |
if (hp->fd >= nhdfrags || !hdfrag[hp->fd].nlinks) /* untracked */ |
424 |
gregl |
3.1 |
hp->bi[i].fo = lseek(hp->fd, 0L, 2); |
425 |
|
|
|
426 |
|
|
else if (hp->bi[i].fo + hp->bi[i].nrd*sizeof(RAYVAL) == |
427 |
gregl |
3.4 |
hdfrag[hp->fd].flen) /* EOF special case */ |
428 |
gregl |
3.11 |
hdfrag[hp->fd].flen = (nfo=hp->bi[i].fo) + nrays*sizeof(RAYVAL); |
429 |
gregl |
3.1 |
|
430 |
|
|
else { /* general case */ |
431 |
gregl |
3.4 |
register struct fragment *f = &hdfrag[hp->fd]; |
432 |
gregl |
3.1 |
register int j, k; |
433 |
|
|
/* relinquish old fragment */ |
434 |
gregl |
3.2 |
if (hp->bi[i].nrd) { |
435 |
gregl |
3.5 |
j = f->nfrags++; |
436 |
gregl |
3.4 |
#ifdef MAXFRAG |
437 |
gregl |
3.5 |
if (j >= MAXFRAG-1) |
438 |
gregl |
3.2 |
f->nfrags--; |
439 |
gregl |
3.4 |
#endif |
440 |
gregl |
3.5 |
if (j % FRAGBLK == 0) { /* more frag. space */ |
441 |
gregl |
3.4 |
if (f->fi == NULL) |
442 |
|
|
f->fi = (BEAMI *)malloc( |
443 |
|
|
FRAGBLK*sizeof(BEAMI)); |
444 |
|
|
else |
445 |
|
|
f->fi = (BEAMI *)realloc((char *)f->fi, |
446 |
gregl |
3.5 |
(j+FRAGBLK)*sizeof(BEAMI)); |
447 |
gregl |
3.4 |
if (f->fi == NULL) |
448 |
|
|
error(SYSTEM, |
449 |
gregl |
3.12 |
"out of memory in hdsyncbeam"); |
450 |
gregl |
3.4 |
} |
451 |
gregl |
3.5 |
for ( ; ; j--) { /* insert in descending list */ |
452 |
|
|
if (!j || hp->bi[i].fo < f->fi[j-1].fo) { |
453 |
gregl |
3.2 |
f->fi[j].fo = hp->bi[i].fo; |
454 |
|
|
f->fi[j].nrd = hp->bi[i].nrd; |
455 |
|
|
break; |
456 |
|
|
} |
457 |
gregl |
3.14 |
copystruct(f->fi+j, f->fi+(j-1)); |
458 |
gregl |
3.1 |
} |
459 |
|
|
/* coalesce adjacent fragments */ |
460 |
gregl |
3.2 |
for (j = k = 0; k < f->nfrags; j++, k++) { |
461 |
gregl |
3.3 |
if (k > j) |
462 |
gregl |
3.2 |
copystruct(f->fi+j, f->fi+k); |
463 |
gregl |
3.3 |
while (k+1 < f->nfrags && f->fi[k+1].fo + |
464 |
|
|
f->fi[k+1].nrd*sizeof(RAYVAL) |
465 |
|
|
== f->fi[j].fo) { |
466 |
gregl |
3.2 |
f->fi[j].fo -= |
467 |
|
|
f->fi[++k].nrd*sizeof(RAYVAL); |
468 |
gregl |
3.3 |
f->fi[j].nrd += f->fi[k].nrd; |
469 |
|
|
} |
470 |
gregl |
3.2 |
} |
471 |
|
|
f->nfrags = j; |
472 |
gregl |
3.1 |
} |
473 |
|
|
k = -1; /* find closest-sized fragment */ |
474 |
gregl |
3.11 |
for (j = nrays ? f->nfrags : 0; j-- > 0; ) |
475 |
gregl |
3.1 |
if (f->fi[j].nrd >= nrays && |
476 |
gregl |
3.3 |
(k < 0 || f->fi[j].nrd < f->fi[k].nrd)) |
477 |
|
|
if (f->fi[k=j].nrd == nrays) |
478 |
|
|
break; |
479 |
gregl |
3.1 |
if (k < 0) { /* no fragment -- extend file */ |
480 |
gregl |
3.11 |
nfo = f->flen; |
481 |
gregl |
3.1 |
f->flen += nrays*sizeof(RAYVAL); |
482 |
|
|
} else { /* else use fragment */ |
483 |
gregl |
3.11 |
nfo = f->fi[k].fo; |
484 |
gregl |
3.1 |
if (f->fi[k].nrd == nrays) { /* delete fragment */ |
485 |
|
|
f->nfrags--; |
486 |
|
|
for (j = k; j < f->nfrags; j++) |
487 |
gregl |
3.14 |
copystruct(f->fi+j, f->fi+(j+1)); |
488 |
gregl |
3.1 |
} else { /* else shrink it */ |
489 |
|
|
f->fi[k].fo += nrays*sizeof(RAYVAL); |
490 |
|
|
f->fi[k].nrd -= nrays; |
491 |
|
|
} |
492 |
|
|
} |
493 |
|
|
} |
494 |
gregl |
3.11 |
if (nrays) { /* write the new fragment */ |
495 |
|
|
errno = 0; |
496 |
|
|
if (lseek(hp->fd, nfo, 0) < 0) |
497 |
|
|
error(SYSTEM, "cannot seek on holodeck file"); |
498 |
|
|
n = hp->bl[i]->nrm * sizeof(RAYVAL); |
499 |
|
|
if (write(hp->fd, (char *)hdbray(hp->bl[i]), n) != n) { |
500 |
gregl |
3.13 |
hdfrag[hp->fd].writerr++; |
501 |
|
|
hdsync(hp, 0); /* sync directory */ |
502 |
gregl |
3.12 |
error(SYSTEM, "write error in hdsyncbeam"); |
503 |
gregl |
3.11 |
} |
504 |
|
|
} |
505 |
gregl |
3.1 |
biglob(hp)->nrd += nrays - hp->bi[i].nrd; |
506 |
|
|
hp->bi[i].nrd = nrays; |
507 |
gregl |
3.11 |
hp->bi[i].fo = nfo; |
508 |
gregl |
3.6 |
markdirty(hp); /* section directory now out of date */ |
509 |
gregl |
3.1 |
return(1); |
510 |
|
|
} |
511 |
|
|
|
512 |
|
|
|
513 |
|
|
int |
514 |
|
|
hdfreebeam(hp, i) /* free beam, writing if dirty */ |
515 |
|
|
register HOLO *hp; |
516 |
|
|
register int i; |
517 |
|
|
{ |
518 |
gregl |
3.11 |
int nchanged; |
519 |
gregl |
3.1 |
|
520 |
|
|
if (hp == NULL) { /* clear all holodecks */ |
521 |
|
|
nchanged = 0; |
522 |
|
|
for (i = 0; hdlist[i] != NULL; i++) |
523 |
|
|
nchanged += hdfreebeam(hdlist[i], 0); |
524 |
|
|
return(nchanged); |
525 |
|
|
} |
526 |
gregl |
3.13 |
if (hdfrag[hp->fd].writerr) /* check for file error */ |
527 |
|
|
return(0); |
528 |
gregl |
3.1 |
if (i == 0) { /* clear entire holodeck */ |
529 |
|
|
nchanged = 0; |
530 |
gregl |
3.10 |
for (i = nbeams(hp); i > 0; i--) |
531 |
|
|
if (hp->bl[i] != NULL) |
532 |
|
|
nchanged += hdfreebeam(hp, i); |
533 |
gregl |
3.1 |
return(nchanged); |
534 |
|
|
} |
535 |
gregl |
3.12 |
#ifdef DEBUG |
536 |
gregl |
3.1 |
if (i < 1 | i > nbeams(hp)) |
537 |
|
|
error(CONSISTENCY, "bad beam index to hdfreebeam"); |
538 |
gregl |
3.12 |
#endif |
539 |
gregl |
3.1 |
if (hp->bl[i] == NULL) |
540 |
|
|
return(0); |
541 |
|
|
/* check for additions */ |
542 |
|
|
nchanged = hp->bl[i]->nrm - hp->bi[i].nrd; |
543 |
gregl |
3.11 |
if (nchanged) |
544 |
gregl |
3.12 |
hdsyncbeam(hp, i); /* write new fragment */ |
545 |
gregl |
3.1 |
blglob(hp)->nrm -= hp->bl[i]->nrm; |
546 |
|
|
free((char *)hp->bl[i]); /* free memory */ |
547 |
|
|
hp->bl[i] = NULL; |
548 |
|
|
return(nchanged); |
549 |
|
|
} |
550 |
|
|
|
551 |
|
|
|
552 |
gregl |
3.10 |
int |
553 |
|
|
hdkillbeam(hp, i) /* delete beam from holodeck */ |
554 |
|
|
register HOLO *hp; |
555 |
|
|
register int i; |
556 |
|
|
{ |
557 |
|
|
static BEAM emptybeam; |
558 |
gregl |
3.11 |
int nchanged; |
559 |
gregl |
3.10 |
|
560 |
|
|
if (hp == NULL) { /* clobber all holodecks */ |
561 |
|
|
nchanged = 0; |
562 |
|
|
for (i = 0; hdlist[i] != NULL; i++) |
563 |
|
|
nchanged += hdkillbeam(hdlist[i], 0); |
564 |
|
|
return(nchanged); |
565 |
|
|
} |
566 |
|
|
if (i == 0) { /* clobber entire holodeck */ |
567 |
|
|
nchanged = 0; |
568 |
|
|
for (i = nbeams(hp); i > 0; i--) |
569 |
|
|
if (hp->bi[i].nrd > 0 || hp->bl[i] != NULL) |
570 |
|
|
nchanged += hdkillbeam(hp, i); |
571 |
|
|
#ifdef DEBUG |
572 |
|
|
if (biglob(hp)->nrd != 0 | blglob(hp)->nrm != 0) |
573 |
|
|
error(CONSISTENCY, "bad beam count in hdkillbeam"); |
574 |
|
|
#endif |
575 |
|
|
return(nchanged); |
576 |
|
|
} |
577 |
gregl |
3.12 |
#ifdef DEBUG |
578 |
gregl |
3.10 |
if (i < 1 | i > nbeams(hp)) |
579 |
|
|
error(CONSISTENCY, "bad beam index to hdkillbeam"); |
580 |
gregl |
3.12 |
#endif |
581 |
gregl |
3.10 |
if (hp->bl[i] != NULL) { /* free memory */ |
582 |
|
|
blglob(hp)->nrm -= nchanged = hp->bl[i]->nrm; |
583 |
|
|
free((char *)hp->bl[i]); |
584 |
|
|
} else |
585 |
|
|
nchanged = hp->bi[i].nrd; |
586 |
|
|
if (hp->bi[i].nrd) { /* free file fragment */ |
587 |
|
|
hp->bl[i] = &emptybeam; |
588 |
gregl |
3.12 |
hdsyncbeam(hp, i); |
589 |
gregl |
3.10 |
} |
590 |
|
|
hp->bl[i] = NULL; |
591 |
|
|
return(nchanged); |
592 |
|
|
} |
593 |
|
|
|
594 |
|
|
|
595 |
gregl |
3.14 |
int |
596 |
|
|
hdlrulist(hb, nents, n, hp) /* add beams from holodeck to LRU list */ |
597 |
|
|
register HDBEAMI *hb; /* beam list */ |
598 |
|
|
int nents; /* current list length */ |
599 |
|
|
int n; /* maximum list length */ |
600 |
gregl |
3.1 |
register HOLO *hp; /* section we're adding from */ |
601 |
|
|
{ |
602 |
|
|
register int i, j; |
603 |
|
|
/* insert each beam from hp */ |
604 |
gregl |
3.10 |
for (i = nbeams(hp); i > 0; i--) { |
605 |
gregl |
3.1 |
if (hp->bl[i] == NULL) /* check if loaded */ |
606 |
|
|
continue; |
607 |
gregl |
3.14 |
#if 0 |
608 |
|
|
if (hp->bl[i]->tick == hdclock) /* preempt swap? */ |
609 |
|
|
continue; |
610 |
|
|
#endif |
611 |
|
|
if ((j = ++nents) >= n) /* grow list if we can */ |
612 |
gregl |
3.1 |
nents--; |
613 |
|
|
for ( ; ; ) { /* bubble into place */ |
614 |
|
|
if (!--j || hp->bl[i]->tick >= |
615 |
gregl |
3.14 |
hb[j-1].h->bl[hb[j-1].b]->tick) { |
616 |
|
|
hb[j].h = hp; |
617 |
|
|
hb[j].b = i; |
618 |
gregl |
3.1 |
break; |
619 |
|
|
} |
620 |
gregl |
3.14 |
copystruct(hb+j, hb+(j-1)); |
621 |
gregl |
3.1 |
} |
622 |
|
|
} |
623 |
gregl |
3.14 |
return(nents); /* return new list length */ |
624 |
gregl |
3.1 |
} |
625 |
|
|
|
626 |
|
|
|
627 |
gregl |
3.14 |
int |
628 |
gregl |
3.1 |
hdfreecache(pct, honly) /* free up cache space, writing changes */ |
629 |
|
|
int pct; /* maximum percentage to free */ |
630 |
|
|
register HOLO *honly; /* NULL means check all */ |
631 |
|
|
{ |
632 |
gregl |
3.14 |
HDBEAMI hb[FREEBEAMS]; |
633 |
gregl |
3.1 |
int freetarget; |
634 |
gregl |
3.14 |
int n; |
635 |
gregl |
3.1 |
register int i; |
636 |
|
|
/* compute free target */ |
637 |
|
|
freetarget = (honly != NULL) ? blglob(honly)->nrm : |
638 |
|
|
hdmemuse(0)/sizeof(RAYVAL) ; |
639 |
|
|
freetarget = freetarget*pct/100; |
640 |
gregl |
3.14 |
if (freetarget <= 0) |
641 |
|
|
return(0); |
642 |
gregl |
3.1 |
/* find least recently used */ |
643 |
gregl |
3.14 |
n = 0; |
644 |
gregl |
3.1 |
if (honly != NULL) |
645 |
gregl |
3.14 |
n = hdlrulist(hb, n, FREEBEAMS, honly); |
646 |
gregl |
3.1 |
else |
647 |
|
|
for (i = 0; hdlist[i] != NULL; i++) |
648 |
gregl |
3.14 |
n = hdlrulist(hb, n, FREEBEAMS, hdlist[i]); |
649 |
gregl |
3.1 |
/* free LRU beams */ |
650 |
gregl |
3.14 |
for (i = 0; i < n; i++) { |
651 |
|
|
hdfreebeam(hb[i].h, hb[i].b); |
652 |
|
|
if ((freetarget -= hb[i].h->bi[hb[i].b].nrd) <= 0) |
653 |
gregl |
3.1 |
break; |
654 |
|
|
} |
655 |
gregl |
3.12 |
hdsync(honly, 0); /* synchronize directories as necessary */ |
656 |
gregl |
3.14 |
return(-freetarget); /* return how far past goal we went */ |
657 |
gregl |
3.1 |
} |
658 |
|
|
|
659 |
|
|
|
660 |
|
|
hddone(hp) /* clean up holodeck section and free */ |
661 |
|
|
register HOLO *hp; /* NULL means clean up all */ |
662 |
|
|
{ |
663 |
|
|
register int i; |
664 |
|
|
|
665 |
|
|
if (hp == NULL) { /* NULL means clean up everything */ |
666 |
|
|
while (hdlist[0] != NULL) |
667 |
|
|
hddone(hdlist[0]); |
668 |
|
|
return; |
669 |
|
|
} |
670 |
|
|
/* flush all data and free memory */ |
671 |
|
|
hdflush(hp); |
672 |
|
|
/* release fragment resources */ |
673 |
|
|
hdrelease(hp->fd); |
674 |
|
|
/* remove hp from active list */ |
675 |
|
|
for (i = 0; hdlist[i] != NULL; i++) |
676 |
|
|
if (hdlist[i] == hp) { |
677 |
|
|
while ((hdlist[i] = hdlist[i+1]) != NULL) |
678 |
|
|
i++; |
679 |
|
|
break; |
680 |
|
|
} |
681 |
|
|
free((char *)hp->bl); /* free beam list */ |
682 |
|
|
free((char *)hp); /* free holodeck struct */ |
683 |
|
|
} |