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* Controlling process for multiple children |
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*/ |
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#include <signal.h> |
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#include "rcontrib.h" |
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#include "platform.h" |
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#include "rtprocess.h" |
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#include "selcall.h" |
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|
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#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) */ |
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int nr; /* number of rays to sum (0 if free) */ |
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} kida[MAXPROCESS]; /* our child processes */ |
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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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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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|
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if (accumulate <= 0) /* just accumulating? */ |
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return(0); |
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|
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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; |
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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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/* 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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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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int rval; |
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|
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while (nchild < nproc) { /* fork until target reached */ |
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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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rval = open_process(&kida[nchild].pr, NULL); |
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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_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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fclose(kida[nchild].infp); |
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} |
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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 = 0; |
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account = accumulate = 0; |
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} |
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return(1); /* child return value */ |
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return(1); /* return "true" in child */ |
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} |
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if (pid < 0) |
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error(SYSTEM, "fork() call failed!"); |
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/* connect parent's pipes */ |
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close(p0[0]); close(p1[1]); |
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kida[nchild].pr.r = p1[0]; |
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kida[nchild].pr.w = p0[1]; |
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kida[nchild].pr.pid = pid; |
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kida[nchild].pr.running = 1; |
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kida[nchild].infp = fdopen(p1[0], "rb"); |
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if (rval != PIPE_BUF) |
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error(CONSISTENCY, "bad value from open_process()"); |
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/* connect to child's output */ |
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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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#endif |
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kida[nchild++].nr = 0; /* mark as available */ |
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} |
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return(0); /* parent return value */ |
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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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fclose(kida[nchild].infp); |
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kida[nchild].pr.r = -1; /* close(-1) error is ignored */ |
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if ((status = close_process(&kida[nchild].pr)) > 0) { |
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if (immed) /* error mode -- quick exit */ |
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kill(kida[nchild].pr.pid, SIGKILL); |
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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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error(WARNING, errmsg); |
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} |
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fclose(kida[nchild].infp); |
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} |
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} |
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|
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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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int ninq = 0; |
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if ((yres <= 0) | (xres <= 0)) |
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waitflush = 1; /* flush next */ |
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put_zero_record(++lastray); |
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} else if (++ninq >= qlimit || accumulate > 1 && |
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} else if (++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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} |
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while (next_child_nq(1) >= 0) /* empty results queue */ |
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; |
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/* output accumulated record */ |
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if (accumulate <= 0 || account < accumulate) { |
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end_children(); /* frees up file descriptors */ |
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if (account < accumulate) { |
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error(WARNING, "partial accumulation in final record"); |
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accumulate -= account; |
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} |
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for (i = 0; i < nmods; i++) |
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mod_output(out_bq->mca[i]); |
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end_record(); |
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free_binq(out_bq); |
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if (account < accumulate) { |
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error(WARNING, "partial accumulation in final record"); |
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free_binq(out_bq); /* XXX just ignore it */ |
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out_bq = NULL; |
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} |
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free_binq(NULL); /* clean up */ |
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lu_done(&ofiletab); |
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if (raysleft) |
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error(USER, "unexpected EOF on input"); |
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free_binq(NULL); /* clean up */ |
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} |
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|
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|
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/* Wait for the next available child by monitoring "to" pipes */ |
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static int |
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next_child_ready() |
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{ |
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fd_set writeset, errset; |
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int i, n; |
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|
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for (i = nchild; i--; ) /* see if there's one free first */ |
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if (!kida[i].nr) |
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return(i); |
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/* prepare select() call */ |
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FD_ZERO(&writeset); FD_ZERO(&errset); |
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n = 0; |
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for (i = nchild; i--; ) { |
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FD_SET(kida[i].pr.w, &writeset); |
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FD_SET(kida[i].pr.r, &errset); |
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if (kida[i].pr.w >= n) |
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n = kida[i].pr.w + 1; |
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if (kida[i].pr.r >= n) |
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n = kida[i].pr.r + 1; |
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} |
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errno = 0; |
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n = select(n, NULL, &writeset, &errset, NULL); |
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if (n < 0) |
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error(SYSTEM, "select() error in next_child_ready()"); |
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n = -1; /* identify waiting child */ |
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for (i = nchild; i--; ) { |
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if (FD_ISSET(kida[i].pr.r, &errset)) |
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error(USER, "rendering process died"); |
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if (FD_ISSET(kida[i].pr.w, &writeset)) |
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kida[n = i].nr = 0; |
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} |
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return(n); /* first available child */ |
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} |
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|
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|
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/* Modified parental loop for full accumulation mode (-c 0) */ |
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void |
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feeder_loop() |
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> |
{ |
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> |
static int ignore_warning_given = 0; |
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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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/* load rays from stdin & process */ |
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> |
#ifdef getc_unlocked |
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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) { |
| 512 |
> |
if (orgdir[2*ninq+1][0] == 0.0 && /* asking for flush? */ |
| 513 |
> |
(orgdir[2*ninq+1][1] == 0.0) & |
| 514 |
> |
(orgdir[2*ninq+1][2] == 0.0)) { |
| 515 |
> |
if (!ignore_warning_given++) |
| 516 |
> |
error(WARNING, |
| 517 |
> |
"dummy ray(s) ignored during accumulation\n"); |
| 518 |
> |
continue; |
| 519 |
> |
} |
| 520 |
> |
if (++ninq >= MAXIQ) { |
| 521 |
> |
i = next_child_ready(); /* get eager child */ |
| 522 |
> |
n = sizeof(FVECT)*2 * ninq; /* give assignment */ |
| 523 |
> |
if (writebuf(kida[i].pr.w, (char *)orgdir, n) != n) |
| 524 |
> |
error(SYSTEM, "pipe write error"); |
| 525 |
> |
kida[i].r1 = lastray+1; |
| 526 |
> |
lastray += kida[i].nr = ninq; |
| 527 |
> |
ninq = 0; |
| 528 |
> |
if (lastray < lastdone) /* RNUMBER wrapped? */ |
| 529 |
> |
lastdone = lastray = 0; |
| 530 |
> |
} |
| 531 |
> |
if (raysleft && !--raysleft) |
| 532 |
> |
break; /* preemptive EOI */ |
| 533 |
> |
} |
| 534 |
> |
if (ninq) { /* polish off input */ |
| 535 |
> |
i = next_child_ready(); |
| 536 |
> |
n = sizeof(FVECT)*2 * ninq; |
| 537 |
> |
if (writebuf(kida[i].pr.w, (char *)orgdir, n) != n) |
| 538 |
> |
error(SYSTEM, "pipe write error"); |
| 539 |
> |
kida[i].r1 = lastray+1; |
| 540 |
> |
lastray += kida[i].nr = ninq; |
| 541 |
> |
ninq = 0; |
| 542 |
> |
} |
| 543 |
> |
memset(orgdir, 0, sizeof(FVECT)*2); /* get results */ |
| 544 |
> |
for (i = nchild; i--; ) { |
| 545 |
> |
writebuf(kida[i].pr.w, (char *)orgdir, sizeof(FVECT)*2); |
| 546 |
> |
queue_results(i); |
| 547 |
> |
} |
| 548 |
> |
if (recover) /* and from before? */ |
| 549 |
> |
queue_modifiers(); |
| 550 |
> |
end_children(0); /* free up file descriptors */ |
| 551 |
> |
for (i = 0; i < nmods; i++) |
| 552 |
> |
mod_output(out_bq->mca[i]); /* output accumulated record */ |
| 553 |
> |
end_record(); |
| 554 |
> |
free_binq(out_bq); /* clean up */ |
| 555 |
> |
out_bq = NULL; |
| 556 |
> |
free_binq(NULL); |
| 557 |
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lu_done(&ofiletab); |
| 558 |
< |
#undef MAXIQ |
| 558 |
> |
if (raysleft) |
| 559 |
> |
error(USER, "unexpected EOF on input"); |
| 560 |
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} |
