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* Controlling process for multiple children |
| 7 |
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*/ |
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|
| 9 |
+ |
#include <signal.h> |
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#include "rcontrib.h" |
| 10 |
– |
#include "platform.h" |
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– |
#include "rtprocess.h" |
| 11 |
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#include "selcall.h" |
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|
| 13 |
+ |
#define MAXIQ (int)(PIPE_BUF/(sizeof(FVECT)*2)) |
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+ |
|
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/* Modifier contribution queue (results waiting to be output) */ |
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typedef struct s_binq { |
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RNUMBER ndx; /* index for this entry */ |
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RNUMBER r1; /* assigned ray starting index */ |
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SUBPROC pr; /* PID, i/o descriptors */ |
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FILE *infp; /* file pointer to read from process */ |
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< |
int nr; /* number rays to sum (0 if free) */ |
| 30 |
> |
int nr; /* number of rays to sum (0 if free) */ |
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} kida[MAXPROCESS]; /* our child processes */ |
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|
| 33 |
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|
| 95 |
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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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> |
static void |
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queue_modifiers() |
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{ |
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MODCONT *mpin, *mpout; |
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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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> |
b_last = NULL; /* 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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int nready = 0; |
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BINQ *bp; |
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|
| 187 |
– |
if (accumulate <= 0) /* just accumulating? */ |
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– |
return(0); |
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– |
|
| 188 |
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for (bp = out_bq; bp != NULL && bp->nadded >= accumulate && |
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bp->ndx == lastdone+nready*accumulate+1; |
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bp = bp->next) |
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int nout = 0; |
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BINQ *bp; |
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int i; |
| 204 |
< |
|
| 207 |
< |
if (accumulate <= 0) /* just accumulating? */ |
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< |
return(0); |
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< |
/* else output ready results */ |
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> |
/* output ready results */ |
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while (out_bq != NULL && out_bq->nadded >= accumulate |
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&& out_bq->ndx == lastdone+1) { |
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if ((nmax > 0) & (nout >= nmax)) |
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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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> |
/* Start child processes if we can (call only once in parent!) */ |
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int |
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in_rchild() |
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{ |
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if (rval < 0) |
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error(SYSTEM, "open_process() call failed"); |
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if (rval == 0) { /* if in child, set up & return true */ |
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< |
lu_doall(&modconttab, set_stdout, NULL); |
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> |
lu_doall(&modconttab, &set_stdout, NULL); |
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lu_done(&ofiletab); |
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while (nchild--) { /* don't share other pipes */ |
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close(kida[nchild].pr.w); |
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kida[nchild].infp = fdopen(kida[nchild].pr.r, "rb"); |
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if (kida[nchild].infp == NULL) |
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error(SYSTEM, "out of memory in in_rchild()"); |
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– |
#ifdef getc_unlocked |
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– |
flockfile(kida[nchild].infp); /* avoid mutex overhead */ |
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#endif |
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kida[nchild++].nr = 0; /* mark as available */ |
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} |
| 308 |
+ |
#ifdef getc_unlocked |
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+ |
for (rval = nchild; rval--; ) /* avoid mutex overhead */ |
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+ |
flockfile(kida[rval].infp); |
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+ |
#endif |
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return(0); /* return "false" in parent */ |
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} |
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|
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|
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/* Close child processes */ |
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void |
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< |
end_children() |
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> |
end_children(int immed) |
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{ |
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int status; |
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|
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while (nchild > 0) { |
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nchild--; |
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< |
if ((status = close_process(&kida[nchild].pr)) > 0) { |
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> |
#ifdef SIGKILL |
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> |
if (immed) /* error mode -- quick exit */ |
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> |
kill(kida[nchild].pr.pid, SIGKILL); |
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> |
#endif |
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> |
if ((status = close_process(&kida[nchild].pr)) > 0 && !immed) { |
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sprintf(errmsg, |
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"rendering process returned bad status (%d)", |
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status); |
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void |
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parental_loop() |
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{ |
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< |
#define MAXIQ (int)(PIPE_BUF/(sizeof(FVECT)*2)) |
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< |
static int ignore_warning_given = 0; |
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< |
int qlimit = (accumulate == 1) ? 1 : MAXIQ-1; |
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> |
const int qlimit = (accumulate == 1) ? 1 : MAXIQ-1; |
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int ninq = 0; |
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FVECT orgdir[2*MAXIQ]; |
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int i, n; |
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flockfile(stdin); /* avoid lock/unlock overhead */ |
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#endif |
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while (getvec(orgdir[2*ninq]) == 0 && getvec(orgdir[2*ninq+1]) == 0) { |
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< |
if (orgdir[2*ninq+1][0] == 0.0 && /* asking for flush? */ |
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< |
(orgdir[2*ninq+1][1] == 0.0) & |
| 415 |
< |
(orgdir[2*ninq+1][2] == 0.0)) { |
| 416 |
< |
if (accumulate != 1) { |
| 417 |
< |
if (!ignore_warning_given++) |
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< |
error(WARNING, |
| 421 |
< |
"dummy ray(s) ignored during accumulation\n"); |
| 422 |
< |
continue; |
| 423 |
< |
} |
| 424 |
< |
while (next_child_nq(1) >= 0) |
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< |
; /* clear the queue */ |
| 426 |
< |
lastdone = lastray = 0; |
| 427 |
< |
if ((yres <= 0) | (xres <= 0)) |
| 428 |
< |
waitflush = 1; /* flush next */ |
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< |
put_zero_record(++lastray); |
| 430 |
< |
} else if (++ninq >= qlimit || accumulate > 1 && |
| 413 |
> |
const int zero_ray = orgdir[2*ninq+1][0] == 0.0 && |
| 414 |
> |
(orgdir[2*ninq+1][1] == 0.0) & |
| 415 |
> |
(orgdir[2*ninq+1][2] == 0.0); |
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> |
ninq += !zero_ray; |
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> |
/* Zero ray cannot go in input queue */ |
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> |
if (zero_ray ? ninq : ninq >= qlimit || |
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lastray/accumulate != (lastray+ninq)/accumulate) { |
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i = next_child_nq(0); /* manages output */ |
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n = ninq; |
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< |
if (accumulate != 1) /* request flush? */ |
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> |
if (accumulate > 1) /* need terminator? */ |
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memset(orgdir[2*n++], 0, sizeof(FVECT)*2); |
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n *= sizeof(FVECT)*2; /* send assignment */ |
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if (writebuf(kida[i].pr.w, (char *)orgdir, n) != n) |
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error(SYSTEM, "pipe write error"); |
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kida[i].r1 = lastray+1; |
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lastray += kida[i].nr = ninq; /* mark as busy */ |
| 441 |
– |
ninq = 0; |
| 429 |
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if (lastray < lastdone) { /* RNUMBER wrapped? */ |
| 430 |
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while (next_child_nq(1) >= 0) |
| 431 |
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; |
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< |
lastdone = lastray = 0; |
| 432 |
> |
lastray -= ninq; |
| 433 |
> |
lastdone = lastray %= accumulate; |
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} |
| 435 |
+ |
ninq = 0; |
| 436 |
|
} |
| 437 |
+ |
if (zero_ray) { /* put bogus record? */ |
| 438 |
+ |
if ((yres <= 0) | (xres <= 1) && |
| 439 |
+ |
(lastray+1) % accumulate == 0) { |
| 440 |
+ |
while (next_child_nq(1) >= 0) |
| 441 |
+ |
; /* clear the queue */ |
| 442 |
+ |
lastdone = lastray = accumulate-1; |
| 443 |
+ |
waitflush = 1; /* flush next */ |
| 444 |
+ |
} |
| 445 |
+ |
put_zero_record(++lastray); |
| 446 |
+ |
} |
| 447 |
|
if (raysleft && !--raysleft) |
| 448 |
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break; /* preemptive EOI */ |
| 449 |
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} |
| 450 |
|
while (next_child_nq(1) >= 0) /* empty results queue */ |
| 451 |
|
; |
| 452 |
< |
/* output accumulated record */ |
| 453 |
< |
if (accumulate <= 0 || account < accumulate) { |
| 454 |
< |
end_children(); /* frees up file descriptors */ |
| 456 |
< |
if (account < accumulate) { |
| 457 |
< |
error(WARNING, "partial accumulation in final record"); |
| 458 |
< |
accumulate -= account; |
| 459 |
< |
} |
| 460 |
< |
for (i = 0; i < nmods; i++) |
| 461 |
< |
mod_output(out_bq->mca[i]); |
| 462 |
< |
end_record(); |
| 463 |
< |
free_binq(out_bq); |
| 452 |
> |
if (account < accumulate) { |
| 453 |
> |
error(WARNING, "partial accumulation in final record"); |
| 454 |
> |
free_binq(out_bq); /* XXX just ignore it */ |
| 455 |
|
out_bq = NULL; |
| 456 |
|
} |
| 457 |
+ |
free_binq(NULL); /* clean up */ |
| 458 |
+ |
lu_done(&ofiletab); |
| 459 |
|
if (raysleft) |
| 460 |
|
error(USER, "unexpected EOF on input"); |
| 461 |
< |
free_binq(NULL); /* clean up */ |
| 461 |
> |
} |
| 462 |
> |
|
| 463 |
> |
|
| 464 |
> |
/* Wait for the next available child by monitoring "to" pipes */ |
| 465 |
> |
static int |
| 466 |
> |
next_child_ready() |
| 467 |
> |
{ |
| 468 |
> |
fd_set writeset, errset; |
| 469 |
> |
int i, n; |
| 470 |
> |
|
| 471 |
> |
for (i = nchild; i--; ) /* see if there's one free first */ |
| 472 |
> |
if (!kida[i].nr) |
| 473 |
> |
return(i); |
| 474 |
> |
/* prepare select() call */ |
| 475 |
> |
FD_ZERO(&writeset); FD_ZERO(&errset); |
| 476 |
> |
n = 0; |
| 477 |
> |
for (i = nchild; i--; ) { |
| 478 |
> |
FD_SET(kida[i].pr.w, &writeset); |
| 479 |
> |
FD_SET(kida[i].pr.r, &errset); |
| 480 |
> |
if (kida[i].pr.w >= n) |
| 481 |
> |
n = kida[i].pr.w + 1; |
| 482 |
> |
if (kida[i].pr.r >= n) |
| 483 |
> |
n = kida[i].pr.r + 1; |
| 484 |
> |
} |
| 485 |
> |
errno = 0; |
| 486 |
> |
n = select(n, NULL, &writeset, &errset, NULL); |
| 487 |
> |
if (n < 0) |
| 488 |
> |
error(SYSTEM, "select() error in next_child_ready()"); |
| 489 |
> |
n = -1; /* identify waiting child */ |
| 490 |
> |
for (i = nchild; i--; ) { |
| 491 |
> |
if (FD_ISSET(kida[i].pr.r, &errset)) |
| 492 |
> |
error(USER, "rendering process died"); |
| 493 |
> |
if (FD_ISSET(kida[i].pr.w, &writeset)) |
| 494 |
> |
kida[n = i].nr = 0; |
| 495 |
> |
} |
| 496 |
> |
return(n); /* first available child */ |
| 497 |
> |
} |
| 498 |
> |
|
| 499 |
> |
|
| 500 |
> |
/* Modified parental loop for full accumulation mode (-c 0) */ |
| 501 |
> |
void |
| 502 |
> |
feeder_loop() |
| 503 |
> |
{ |
| 504 |
> |
static int ignore_warning_given = 0; |
| 505 |
> |
int ninq = 0; |
| 506 |
> |
FVECT orgdir[2*MAXIQ]; |
| 507 |
> |
int i, n; |
| 508 |
> |
/* load rays from stdin & process */ |
| 509 |
> |
#ifdef getc_unlocked |
| 510 |
> |
flockfile(stdin); /* avoid lock/unlock overhead */ |
| 511 |
> |
#endif |
| 512 |
> |
while (getvec(orgdir[2*ninq]) == 0 && getvec(orgdir[2*ninq+1]) == 0) { |
| 513 |
> |
if (orgdir[2*ninq+1][0] == 0.0 && /* asking for flush? */ |
| 514 |
> |
(orgdir[2*ninq+1][1] == 0.0) & |
| 515 |
> |
(orgdir[2*ninq+1][2] == 0.0)) { |
| 516 |
> |
if (!ignore_warning_given++) |
| 517 |
> |
error(WARNING, |
| 518 |
> |
"dummy ray(s) ignored during accumulation\n"); |
| 519 |
> |
continue; |
| 520 |
> |
} |
| 521 |
> |
if (++ninq >= MAXIQ) { |
| 522 |
> |
i = next_child_ready(); /* get eager child */ |
| 523 |
> |
n = sizeof(FVECT)*2 * ninq; /* give assignment */ |
| 524 |
> |
if (writebuf(kida[i].pr.w, (char *)orgdir, n) != n) |
| 525 |
> |
error(SYSTEM, "pipe write error"); |
| 526 |
> |
kida[i].r1 = lastray+1; |
| 527 |
> |
lastray += kida[i].nr = ninq; |
| 528 |
> |
if (lastray < lastdone) /* RNUMBER wrapped? */ |
| 529 |
> |
lastdone = lastray = 0; |
| 530 |
> |
ninq = 0; |
| 531 |
> |
} |
| 532 |
> |
if (raysleft && !--raysleft) |
| 533 |
> |
break; /* preemptive EOI */ |
| 534 |
> |
} |
| 535 |
> |
if (ninq) { /* polish off input */ |
| 536 |
> |
i = next_child_ready(); |
| 537 |
> |
n = sizeof(FVECT)*2 * ninq; |
| 538 |
> |
if (writebuf(kida[i].pr.w, (char *)orgdir, n) != n) |
| 539 |
> |
error(SYSTEM, "pipe write error"); |
| 540 |
> |
kida[i].r1 = lastray+1; |
| 541 |
> |
lastray += kida[i].nr = ninq; |
| 542 |
> |
ninq = 0; |
| 543 |
> |
} |
| 544 |
> |
memset(orgdir, 0, sizeof(FVECT)*2); /* get results */ |
| 545 |
> |
for (i = nchild; i--; ) { |
| 546 |
> |
writebuf(kida[i].pr.w, (char *)orgdir, sizeof(FVECT)*2); |
| 547 |
> |
queue_results(i); |
| 548 |
> |
} |
| 549 |
> |
if (recover) /* and from before? */ |
| 550 |
> |
queue_modifiers(); |
| 551 |
> |
end_children(0); /* free up file descriptors */ |
| 552 |
> |
for (i = 0; i < nmods; i++) |
| 553 |
> |
mod_output(out_bq->mca[i]); /* output accumulated record */ |
| 554 |
> |
end_record(); |
| 555 |
> |
free_binq(out_bq); /* clean up */ |
| 556 |
> |
out_bq = NULL; |
| 557 |
> |
free_binq(NULL); |
| 558 |
|
lu_done(&ofiletab); |
| 559 |
< |
#undef MAXIQ |
| 559 |
> |
if (raysleft) |
| 560 |
> |
error(USER, "unexpected EOF on input"); |
| 561 |
|
} |
