| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id$"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Accumulate ray contributions for a set of materials |
| 6 |
* Controlling process for multiple children |
| 7 |
*/ |
| 8 |
|
| 9 |
#include "rcontrib.h" |
| 10 |
#include "platform.h" |
| 11 |
#include "rtprocess.h" |
| 12 |
#include "selcall.h" |
| 13 |
|
| 14 |
/* Modifier contribution queue (results waiting to be output) */ |
| 15 |
typedef struct s_binq { |
| 16 |
int ndx; /* index for this entry */ |
| 17 |
int n2add; /* number left to add */ |
| 18 |
struct s_binq *next; /* next in queue */ |
| 19 |
MODCONT *mca[1]; /* contrib. array (extends struct) */ |
| 20 |
} BINQ; |
| 21 |
|
| 22 |
static BINQ *out_bq = NULL; /* output bin queue */ |
| 23 |
static BINQ *free_bq = NULL; /* free queue entries */ |
| 24 |
|
| 25 |
static SUBPROC kida[MAXPROCESS]; /* child processes */ |
| 26 |
|
| 27 |
|
| 28 |
/* Get new (empty) bin queue entry */ |
| 29 |
static BINQ * |
| 30 |
new_binq() |
| 31 |
{ |
| 32 |
BINQ *bp = free_bq; |
| 33 |
int i; |
| 34 |
|
| 35 |
if (bp != NULL) { /* something already available? */ |
| 36 |
free_bq = bp->next; |
| 37 |
bp->next = NULL; |
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bp->n2add = accumulate-1; |
| 39 |
return(bp); |
| 40 |
} |
| 41 |
/* else allocate fresh */ |
| 42 |
bp = (BINQ *)malloc(sizeof(BINQ)+(nmods-1)*sizeof(MODCONT *)); |
| 43 |
if (bp == NULL) |
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goto memerr; |
| 45 |
for (i = nmods; i--; ) { |
| 46 |
MODCONT *mp = (MODCONT *)lu_find(&modconttab,modname[i])->data; |
| 47 |
bp->mca[i] = (MODCONT *)malloc(sizeof(MODCONT) + |
| 48 |
sizeof(DCOLOR)*(mp->nbins-1)); |
| 49 |
if (bp->mca[i] == NULL) |
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goto memerr; |
| 51 |
memcpy(bp->mca[i], mp, sizeof(MODCONT)-sizeof(DCOLOR)); |
| 52 |
/* memset(bp->mca[i]->cbin, 0, sizeof(DCOLOR)*mp->nbins); */ |
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} |
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bp->ndx = 0; |
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bp->n2add = accumulate-1; |
| 56 |
bp->next = NULL; |
| 57 |
return(bp); |
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memerr: |
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error(SYSTEM, "out of memory in new_binq()"); |
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return(NULL); |
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} |
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|
| 63 |
|
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/* Free a bin queue entry */ |
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static void |
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free_binq(BINQ *bp) |
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{ |
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int i; |
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|
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if (bp == NULL) { /* signal to release our free list */ |
| 71 |
while ((bp = free_bq) != NULL) { |
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free_bq = bp->next; |
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for (i = nmods; i--; ) |
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free(bp->mca[i]); |
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/* Note: we don't own bp->mca[i]->binv */ |
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free(bp); |
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} |
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return; |
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} |
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/* clear sums for next use */ |
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/* for (i = nmods; i--; ) |
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memset(bp->mca[i]->cbin, 0, sizeof(DCOLOR)*bp->mca[i]->nbins); |
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*/ |
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bp->ndx = 0; |
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bp->next = free_bq; /* push onto free list */ |
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free_bq = bp; |
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} |
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|
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|
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/* Add modifier values to accumulation record in queue and clear */ |
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void |
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queue_modifiers() |
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{ |
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MODCONT *mpin, *mpout; |
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int i, j; |
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|
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if ((accumulate > 0) | (out_bq == NULL)) |
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error(CONSISTENCY, "bad call to queue_modifiers()"); |
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|
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for (i = nmods; i--; ) { |
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mpin = (MODCONT *)lu_find(&modconttab,modname[i])->data; |
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mpout = out_bq->mca[i]; |
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for (j = mpout->nbins; j--; ) |
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addcolor(mpout->cbin[j], mpin->cbin[j]); |
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memset(mpin->cbin, 0, sizeof(DCOLOR)*mpin->nbins); |
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} |
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} |
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|
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|
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/* Sum one modifier record into another (doesn't update n2add) */ |
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static void |
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add_modbin(BINQ *dst, BINQ *src) |
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{ |
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int i, j; |
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|
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for (i = nmods; i--; ) { |
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MODCONT *mpin = src->mca[i]; |
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MODCONT *mpout = dst->mca[i]; |
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for (j = mpout->nbins; j--; ) |
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addcolor(mpout->cbin[j], mpin->cbin[j]); |
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} |
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} |
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|
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|
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/* Queue output, catching up with and freeing FIFO entries when possible */ |
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static int |
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queue_output(BINQ *bp) |
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{ |
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int nout = 0; |
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BINQ *b_last, *b_cur; |
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int i; |
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|
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if (accumulate <= 0) { /* just accumulating? */ |
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if (out_bq == NULL) { |
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bp->next = NULL; |
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out_bq = bp; |
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} else { |
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add_modbin(out_bq, bp); |
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free_binq(bp); |
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} |
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return(0); |
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} |
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b_last = NULL; /* else insert in output queue */ |
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for (b_cur = out_bq; b_cur != NULL && b_cur->ndx < bp->ndx; |
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b_cur = b_cur->next) |
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b_last = b_cur; |
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if (b_last != NULL) { |
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bp->next = b_cur; |
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b_last->next = bp; |
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} else { |
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bp->next = out_bq; |
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out_bq = bp; |
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} |
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if (accumulate > 1) { /* merge accumulation entries */ |
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b_cur = out_bq; |
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while (b_cur->next != NULL) { |
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if (b_cur->n2add <= 0 || |
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(b_cur->ndx-1)/accumulate != |
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(b_cur->next->ndx-1)/accumulate) { |
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b_cur = b_cur->next; |
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continue; |
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} |
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add_modbin(b_cur, b_cur->next); |
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b_cur->n2add--; |
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b_last = b_cur->next; |
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b_cur->next = b_last->next; |
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b_last->next = NULL; |
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free_binq(b_last); |
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} |
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} |
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/* output ready results */ |
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while (out_bq != NULL && (out_bq->ndx == lastdone+1) & !out_bq->n2add) { |
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b_cur = out_bq; /* pop off first entry */ |
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out_bq = b_cur->next; |
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b_cur->next = NULL; |
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for (i = 0; i < nmods; i++) /* output record */ |
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mod_output(b_cur->mca[i]); |
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end_record(); |
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free_binq(b_cur); /* free this entry */ |
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lastdone += accumulate; |
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++nout; |
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} |
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return(nout); |
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} |
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|
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|
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/* Put a zero record in results queue */ |
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void |
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zero_record(int ndx) |
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{ |
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BINQ *bp = new_binq(); |
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int i; |
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|
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for (i = nmods; i--; ) |
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memset(bp->mca[i]->cbin, 0, sizeof(DCOLOR)*bp->mca[i]->nbins); |
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bp->ndx = ndx; |
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queue_output(bp); |
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} |
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|
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|
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/* callback to set output spec to NULL (stdout) */ |
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static int |
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set_stdout(const LUENT *le, void *p) |
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{ |
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(*(MODCONT *)le->data).outspec = NULL; |
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return(0); |
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} |
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|
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|
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/* Start child processes if we can */ |
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int |
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in_rchild() |
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{ |
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#ifdef _WIN32 |
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error(WARNING, "multiprocessing unsupported -- running solo"); |
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nproc = 1; |
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return(1); |
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#else |
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/* try to fork ourselves */ |
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while (nchild < nproc) { |
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int p0[2], p1[2]; |
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int pid; |
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/* prepare i/o pipes */ |
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if (pipe(p0) < 0 || pipe(p1) < 0) |
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error(SYSTEM, "pipe() call failed!"); |
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pid = fork(); /* fork parent process */ |
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if (pid == 0) { /* if in child, set up & return true */ |
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close(p0[1]); close(p1[0]); |
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dup2(p0[0], 0); close(p0[0]); |
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dup2(p1[1], 1); close(p1[1]); |
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inpfmt = (sizeof(RREAL)==sizeof(double)) ? 'd' : 'f'; |
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outfmt = 'd'; |
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header = 0; |
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waitflush = xres = 1; |
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yres = 0; |
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raysleft = 0; |
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account = accumulate = 1; |
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lu_doall(&modconttab, set_stdout, NULL); |
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nchild = -1; |
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return(1); /* child return value */ |
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} |
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if (pid < 0) |
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error(SYSTEM, "fork() call failed!"); |
| 244 |
/* connect our pipes */ |
| 245 |
close(p0[0]); close(p1[1]); |
| 246 |
kida[nchild].r = p1[0]; |
| 247 |
kida[nchild].w = p0[1]; |
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kida[nchild].pid = pid; |
| 249 |
kida[nchild].running = -1; |
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++nchild; |
| 251 |
} |
| 252 |
return(0); /* parent return value */ |
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#endif |
| 254 |
} |
| 255 |
|
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|
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/* Close child processes */ |
| 258 |
void |
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end_children() |
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{ |
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int status; |
| 262 |
|
| 263 |
while (nchild-- > 0) |
| 264 |
if ((status = close_process(&kida[nchild])) > 0) { |
| 265 |
sprintf(errmsg, |
| 266 |
"rendering process returned bad status (%d)", |
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status); |
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error(WARNING, errmsg); |
| 269 |
} |
| 270 |
} |
| 271 |
|
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|
| 273 |
/* Wait for the next available child */ |
| 274 |
static int |
| 275 |
next_child_nq(int force_wait) |
| 276 |
{ |
| 277 |
fd_set readset, errset; |
| 278 |
int i, j, n, nr; |
| 279 |
|
| 280 |
if (!force_wait) /* see if there's one free */ |
| 281 |
for (i = nchild; i--; ) |
| 282 |
if (kida[i].running < 0) |
| 283 |
return(i); |
| 284 |
/* prepare select() call */ |
| 285 |
FD_ZERO(&readset); FD_ZERO(&errset); |
| 286 |
n = nr = 0; |
| 287 |
for (i = nchild; i--; ) { |
| 288 |
if (kida[i].running > 0) { |
| 289 |
FD_SET(kida[i].r, &readset); |
| 290 |
++nr; |
| 291 |
} |
| 292 |
FD_SET(kida[i].r, &errset); |
| 293 |
if (kida[i].r >= n) |
| 294 |
n = kida[i].r + 1; |
| 295 |
} |
| 296 |
if (!nr) /* nothing going on */ |
| 297 |
return(-1); |
| 298 |
if (nr > 1) { /* call select if multiple busy */ |
| 299 |
errno = 0; |
| 300 |
if (select(n, &readset, NULL, &errset, NULL) < 0) |
| 301 |
error(SYSTEM, "select call error in next_child_nq()"); |
| 302 |
} else |
| 303 |
FD_ZERO(&errset); |
| 304 |
n = -1; /* read results from child(ren) */ |
| 305 |
for (i = nchild; i--; ) { |
| 306 |
BINQ *bq; |
| 307 |
if (FD_ISSET(kida[i].r, &errset)) |
| 308 |
error(USER, "rendering process died"); |
| 309 |
if (!FD_ISSET(kida[i].r, &readset)) |
| 310 |
continue; |
| 311 |
bq = new_binq(); /* get results holder */ |
| 312 |
bq->ndx = kida[i].running; |
| 313 |
/* read from child */ |
| 314 |
for (j = 0; j < nmods; j++) { |
| 315 |
n = sizeof(DCOLOR)*bq->mca[j]->nbins; |
| 316 |
nr = readbuf(kida[i].r, (char *)bq->mca[j]->cbin, n); |
| 317 |
if (nr != n) |
| 318 |
error(SYSTEM, "read error from render process"); |
| 319 |
} |
| 320 |
queue_output(bq); /* put results in output queue */ |
| 321 |
kida[i].running = -1; /* mark child as available */ |
| 322 |
n = i; |
| 323 |
} |
| 324 |
return(n); /* last available child */ |
| 325 |
} |
| 326 |
|
| 327 |
|
| 328 |
/* Run parental oversight loop */ |
| 329 |
void |
| 330 |
parental_loop() |
| 331 |
{ |
| 332 |
static int ignore_warning_given = 0; |
| 333 |
FVECT orgdir[2]; |
| 334 |
double d; |
| 335 |
/* load rays from stdin & process */ |
| 336 |
#ifdef getc_unlocked |
| 337 |
flockfile(stdin); /* avoid lock/unlock overhead */ |
| 338 |
#endif |
| 339 |
while (getvec(orgdir[0]) == 0 && getvec(orgdir[1]) == 0) { |
| 340 |
d = normalize(orgdir[1]); |
| 341 |
/* asking for flush? */ |
| 342 |
if ((d == 0.0) & (accumulate != 1)) { |
| 343 |
if (!ignore_warning_given++) |
| 344 |
error(WARNING, |
| 345 |
"dummy ray(s) ignored during accumulation\n"); |
| 346 |
continue; |
| 347 |
} |
| 348 |
if ((d == 0.0) | (lastray+1 < lastray)) { |
| 349 |
while (next_child_nq(1) >= 0) |
| 350 |
; |
| 351 |
lastdone = lastray = 0; |
| 352 |
} |
| 353 |
if (d == 0.0) { |
| 354 |
if ((yres <= 0) | (xres <= 0)) |
| 355 |
waitflush = 1; /* flush right after */ |
| 356 |
zero_record(++lastray); |
| 357 |
} else { /* else assign */ |
| 358 |
int avail = next_child_nq(0); |
| 359 |
if (writebuf(kida[avail].w, (char *)orgdir, |
| 360 |
sizeof(FVECT)*2) != sizeof(FVECT)*2) |
| 361 |
error(SYSTEM, "pipe write error"); |
| 362 |
kida[avail].running = ++lastray; |
| 363 |
} |
| 364 |
if (raysleft && !--raysleft) |
| 365 |
break; /* preemptive EOI */ |
| 366 |
} |
| 367 |
while (next_child_nq(1) >= 0) /* empty results queue */ |
| 368 |
; |
| 369 |
/* output accumulated record */ |
| 370 |
if (accumulate <= 0 || account < accumulate) { |
| 371 |
int i; |
| 372 |
if (account < accumulate) { |
| 373 |
error(WARNING, "partial accumulation in final record"); |
| 374 |
accumulate -= account; |
| 375 |
} |
| 376 |
for (i = 0; i < nmods; i++) |
| 377 |
mod_output(out_bq->mca[i]); |
| 378 |
end_record(); |
| 379 |
} |
| 380 |
if (raysleft) |
| 381 |
error(USER, "unexpected EOF on input"); |
| 382 |
free_binq(NULL); /* clean up */ |
| 383 |
lu_done(&ofiletab); |
| 384 |
} |
