| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: rc3.c,v 2.2 2012/06/09 16:47:27 greg Exp $"; |
| 3 |
#endif |
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/* |
| 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 */ |
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MODCONT *mca[1]; /* contrib. array (extends struct) */ |
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} 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 |
static FILE *inq_fp[MAXPROCESS]; /* input streams */ |
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|
| 28 |
|
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/* Get new (empty) bin queue entry */ |
| 30 |
static BINQ * |
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new_binq() |
| 32 |
{ |
| 33 |
BINQ *bp = free_bq; |
| 34 |
int i; |
| 35 |
|
| 36 |
if (bp != NULL) { /* something already available? */ |
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free_bq = bp->next; |
| 38 |
bp->next = NULL; |
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bp->n2add = accumulate-1; |
| 40 |
return(bp); |
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} |
| 42 |
/* else allocate fresh */ |
| 43 |
bp = (BINQ *)malloc(sizeof(BINQ)+(nmods-1)*sizeof(MODCONT *)); |
| 44 |
if (bp == NULL) |
| 45 |
goto memerr; |
| 46 |
for (i = nmods; i--; ) { |
| 47 |
MODCONT *mp = (MODCONT *)lu_find(&modconttab,modname[i])->data; |
| 48 |
bp->mca[i] = (MODCONT *)malloc(sizeof(MODCONT) + |
| 49 |
sizeof(DCOLOR)*(mp->nbins-1)); |
| 50 |
if (bp->mca[i] == NULL) |
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goto memerr; |
| 52 |
memcpy(bp->mca[i], mp, sizeof(MODCONT)-sizeof(DCOLOR)); |
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/* memset(bp->mca[i]->cbin, 0, sizeof(DCOLOR)*mp->nbins); */ |
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} |
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bp->ndx = 0; |
| 56 |
bp->n2add = accumulate-1; |
| 57 |
bp->next = NULL; |
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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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} |
| 63 |
|
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|
| 65 |
/* Free a bin queue entry */ |
| 66 |
static void |
| 67 |
free_binq(BINQ *bp) |
| 68 |
{ |
| 69 |
int i; |
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|
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if (bp == NULL) { /* signal to release our free list */ |
| 72 |
while ((bp = free_bq) != NULL) { |
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free_bq = bp->next; |
| 74 |
for (i = nmods; i--; ) |
| 75 |
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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} |
| 81 |
/* clear sums for next use */ |
| 82 |
/* 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; |
| 86 |
bp->next = free_bq; /* push onto free list */ |
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free_bq = bp; |
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} |
| 89 |
|
| 90 |
|
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/* Add modifier values to accumulation record in queue and clear */ |
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void |
| 93 |
queue_modifiers() |
| 94 |
{ |
| 95 |
MODCONT *mpin, *mpout; |
| 96 |
int i, j; |
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|
| 98 |
if ((accumulate > 0) | (out_bq == NULL)) |
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error(CONSISTENCY, "bad call to queue_modifiers()"); |
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|
| 101 |
for (i = nmods; i--; ) { |
| 102 |
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) */ |
| 112 |
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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|
| 117 |
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 values for later output */ |
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static void |
| 128 |
queue_output(BINQ *bp) |
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{ |
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BINQ *b_last, *b_cur; |
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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; |
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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) /* no accumulation? */ |
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return; |
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b_cur = out_bq; /* else merge accumulation entries */ |
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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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|
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|
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/* Get current with output queue by producing ready results */ |
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static int |
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output_catchup() |
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{ |
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int nout = 0; |
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BINQ *bp; |
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int i; |
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|
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if (accumulate <= 0) /* just accumulating? */ |
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return(0); |
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/* else output ready results */ |
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while (out_bq != NULL && (out_bq->ndx == lastdone+1) & !out_bq->n2add) { |
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bp = out_bq; /* pop off first entry */ |
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out_bq = bp->next; |
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bp->next = NULL; |
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for (i = 0; i < nmods; i++) /* output record */ |
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mod_output(bp->mca[i]); |
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end_record(); |
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free_binq(bp); /* 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 & output */ |
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void |
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put_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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output_catchup(); |
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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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errno = 0; |
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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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} |
| 256 |
if (pid < 0) |
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error(SYSTEM, "fork() call failed!"); |
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/* connect parent's pipes */ |
| 259 |
close(p0[0]); close(p1[1]); |
| 260 |
kida[nchild].r = p1[0]; |
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kida[nchild].w = p0[1]; |
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kida[nchild].pid = pid; |
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kida[nchild].running = -1; |
| 264 |
inq_fp[nchild] = fdopen(p1[0], "rb"); |
| 265 |
if (inq_fp[nchild] == NULL) |
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error(SYSTEM, "out of memory in in_rchild()"); |
| 267 |
#ifdef getc_unlocked |
| 268 |
flockfile(inq_fp[nchild]); /* avoid mutex overhead */ |
| 269 |
#endif |
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++nchild; |
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} |
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return(0); /* parent return value */ |
| 273 |
#endif |
| 274 |
} |
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|
| 276 |
|
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/* Close child processes */ |
| 278 |
void |
| 279 |
end_children() |
| 280 |
{ |
| 281 |
int status; |
| 282 |
|
| 283 |
while (nchild-- > 0) { |
| 284 |
kida[nchild].r = -1; /* close(-1) error is ignored */ |
| 285 |
if ((status = close_process(&kida[nchild])) > 0) { |
| 286 |
sprintf(errmsg, |
| 287 |
"rendering process returned bad status (%d)", |
| 288 |
status); |
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error(WARNING, errmsg); |
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} |
| 291 |
fclose(inq_fp[nchild]); /* performs actual close() */ |
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} |
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} |
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|
| 295 |
|
| 296 |
/* Wait for the next available child, managing output queue as well */ |
| 297 |
static int |
| 298 |
next_child_nq(int force_wait) |
| 299 |
{ |
| 300 |
static struct timeval polling; |
| 301 |
struct timeval *pmode = force_wait | (accumulate <= 0) ? |
| 302 |
(struct timeval *)NULL : &polling; |
| 303 |
fd_set readset, errset; |
| 304 |
int i, j, n, nr; |
| 305 |
|
| 306 |
if (!force_wait) /* see if there's one free */ |
| 307 |
for (i = nchild; i--; ) |
| 308 |
if (kida[i].running < 0) |
| 309 |
return(i); |
| 310 |
/* prepare select() call */ |
| 311 |
FD_ZERO(&readset); FD_ZERO(&errset); |
| 312 |
n = nr = 0; |
| 313 |
for (i = nchild; i--; ) { |
| 314 |
if (kida[i].running > 0) { |
| 315 |
FD_SET(kida[i].r, &readset); |
| 316 |
++nr; |
| 317 |
} |
| 318 |
FD_SET(kida[i].r, &errset); |
| 319 |
if (kida[i].r >= n) |
| 320 |
n = kida[i].r + 1; |
| 321 |
} |
| 322 |
tryagain: |
| 323 |
if (pmode == NULL) /* catch up in case we block */ |
| 324 |
output_catchup(); |
| 325 |
if (!nr) /* nothing to wait for? */ |
| 326 |
return(-1); |
| 327 |
if ((nr > 1) | (pmode == &polling)) { |
| 328 |
errno = 0; |
| 329 |
i = select(n, &readset, NULL, &errset, pmode); |
| 330 |
if (!i) { |
| 331 |
pmode = NULL; /* try again, blocking this time */ |
| 332 |
goto tryagain; |
| 333 |
} |
| 334 |
if (i < 0) |
| 335 |
error(SYSTEM, "select() error in next_child_nq()"); |
| 336 |
} else |
| 337 |
FD_ZERO(&errset); |
| 338 |
n = -1; /* read results from child(ren) */ |
| 339 |
for (i = nchild; i--; ) { |
| 340 |
BINQ *bq; |
| 341 |
if (FD_ISSET(kida[i].r, &errset)) |
| 342 |
error(USER, "rendering process died"); |
| 343 |
if (!FD_ISSET(kida[i].r, &readset)) |
| 344 |
continue; |
| 345 |
bq = new_binq(); /* get results holder */ |
| 346 |
bq->ndx = kida[i].running; |
| 347 |
/* read from child */ |
| 348 |
for (j = 0; j < nmods; j++) { |
| 349 |
nr = bq->mca[j]->nbins; |
| 350 |
if (fread(bq->mca[j]->cbin, sizeof(DCOLOR), nr, |
| 351 |
inq_fp[i]) != nr) |
| 352 |
error(SYSTEM, "read error from render process"); |
| 353 |
} |
| 354 |
queue_output(bq); /* add results to output queue */ |
| 355 |
kida[i].running = -1; /* mark child as available */ |
| 356 |
n = i; |
| 357 |
} |
| 358 |
return(n); /* first available child */ |
| 359 |
} |
| 360 |
|
| 361 |
|
| 362 |
/* Run parental oversight loop */ |
| 363 |
void |
| 364 |
parental_loop() |
| 365 |
{ |
| 366 |
static int ignore_warning_given = 0; |
| 367 |
FVECT orgdir[2]; |
| 368 |
double d; |
| 369 |
int i; |
| 370 |
/* load rays from stdin & process */ |
| 371 |
#ifdef getc_unlocked |
| 372 |
flockfile(stdin); /* avoid lock/unlock overhead */ |
| 373 |
#endif |
| 374 |
while (getvec(orgdir[0]) == 0 && getvec(orgdir[1]) == 0) { |
| 375 |
d = normalize(orgdir[1]); |
| 376 |
/* asking for flush? */ |
| 377 |
if ((d == 0.0) & (accumulate != 1)) { |
| 378 |
if (!ignore_warning_given++) |
| 379 |
error(WARNING, |
| 380 |
"dummy ray(s) ignored during accumulation\n"); |
| 381 |
continue; |
| 382 |
} |
| 383 |
if ((d == 0.0) | (lastray+1 < lastray)) { |
| 384 |
while (next_child_nq(1) >= 0) |
| 385 |
; /* clear the queue */ |
| 386 |
lastdone = lastray = 0; |
| 387 |
} |
| 388 |
if (d == 0.0) { |
| 389 |
if ((yres <= 0) | (xres <= 0)) |
| 390 |
waitflush = 1; /* flush right after */ |
| 391 |
put_zero_record(++lastray); |
| 392 |
} else { /* else assign ray */ |
| 393 |
i = next_child_nq(0); |
| 394 |
if (writebuf(kida[i].w, (char *)orgdir, |
| 395 |
sizeof(orgdir)) != sizeof(orgdir)) |
| 396 |
error(SYSTEM, "pipe write error"); |
| 397 |
kida[i].running = ++lastray; |
| 398 |
} |
| 399 |
if (raysleft && !--raysleft) |
| 400 |
break; /* preemptive EOI */ |
| 401 |
} |
| 402 |
while (next_child_nq(1) >= 0) /* empty results queue */ |
| 403 |
; |
| 404 |
/* output accumulated record */ |
| 405 |
if (accumulate <= 0 || account < accumulate) { |
| 406 |
if (account < accumulate) { |
| 407 |
error(WARNING, "partial accumulation in final record"); |
| 408 |
accumulate -= account; |
| 409 |
} |
| 410 |
for (i = 0; i < nmods; i++) |
| 411 |
mod_output(out_bq->mca[i]); |
| 412 |
end_record(); |
| 413 |
free_binq(out_bq); |
| 414 |
out_bq = NULL; |
| 415 |
} |
| 416 |
if (raysleft) |
| 417 |
error(USER, "unexpected EOF on input"); |
| 418 |
free_binq(NULL); /* clean up */ |
| 419 |
lu_done(&ofiletab); |
| 420 |
} |
