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root/Development/ray/src/rt/RcontribSimulManager.cpp

Comparing ray/src/rt/RcontribSimulManager.cpp (file contents):
Revision 2.1 by greg, Tue Oct 29 00:36:54 2024 UTC vs.
Revision 2.22 by greg, Tue Nov 11 00:19:10 2025 UTC

#	Line 24 | Line 24 | extern const char      HDRSTR[];
24		extern const char       BIGEND[];
25		extern const char       FMTSTR[];
26
27	–	extern int              contrib;                /* computing contributions? */
28	–	extern int              lim_dist;               /* limit distance? */
29	–
27		// new/exclusive, overwrite if exists, or recover data
28		int     RSDOflags[] = {RDSwrite|RDSexcl|RDSextend, RDSwrite|RDSextend,
29		RDSread|RDSwrite};
#	Line 38 | Line 35 | static const char      ROWZEROSTR[] = "NROWS=00000000000000
35		struct RcontribMod {
36		RcontribOutput *        opl;            // pointer to first output channel
37		char *                  params;         // parameters string
38	<	EPNODE *                binv;           // bin expression
38	>	EPNODE *                binv;           // bin expression (NULL if 1 bin)
39		int                     nbins;          // bin count this modifier
40		int                     coffset;        // column offset in bytes
41		DCOLORV                 cbin[1];        // bin accumulator (extends struct)
#	Line 49 | Line 46 | struct RcontribMod {
46		}
47		};
48
49	<	// used to assign record calc to child
49	>	// Struct used to assign record calculation to child
50		struct RowAssignment {
51		uint32                  row;            // row to do
52		uint32                  ac;             // accumulation count
53		};
54
55	<	// Our default data share function
59	<	RdataShare *
60	<	defDataShare(const char *name, RCOutputOp op, size_t siz)
61	<	{
62	<	return new RdataShareMap(name, RSDOflags[op], siz);
63	<	}
55	>	static const char       ROW_DONE[] = "ROW FINISHED\n";
56
57	<	// Allocate rcontrib accumulator
58	<	RcontribMod *
57	>	// allocate rcontrib accumulator
58	>	static RcontribMod *
59		NewRcMod(const char *prms, const char *binexpr, int ncbins)
60		{
61	<	if (ncbins <= 0) return NULL;
61	>	if (binexpr && !*binexpr) binexpr = NULL;
62		if (!prms) prms = "";
63	<	if (!binexpr | (ncbins == 1))
64	<	binexpr = "0";
65	<
63	>	if ((ncbins > 1) & !binexpr) {
64	>	error(USER, "missing bin expression");
65	>	return NULL;
66	>	}
67	>	if (ncbins < 1) ncbins = 1;
68	>
69		RcontribMod *   mp = (RcontribMod *)ecalloc(1, sizeof(RcontribMod) +
70		sizeof(DCOLORV)*(NCSAMP*ncbins-1) +
71		strlen(prms)+1);
72
73	+	if (binexpr) {                          // get/check bin expression
74	+	mp->binv = eparse(const_cast<char *>(binexpr));
75	+	if (mp->binv->type == NUM) {    // constant expression (0)?
76	+	if ((int)evalue(mp->binv) != 0) {
77	+	sprintf(errmsg, "illegal non-zero constant for bin (%s)",
78	+	binexpr);
79	+	error(USER, errmsg);
80	+	}
81	+	if (ncbins > 1) {
82	+	sprintf(errmsg, "bad bin count (%d should be 1)", ncbins);
83	+	error(USER, errmsg);
84	+	}
85	+	epfree(mp->binv, true);
86	+	mp->binv = NULL;
87	+	prms = "";
88	+	ncbins = 1;
89	+	}
90	+	}
91		mp->params = strcpy((char *)(mp->cbin + ncbins*NCSAMP), prms);
79	–	mp->binv = eparse(const_cast<char *>(binexpr));
92		mp->nbins = ncbins;
93		return mp;
94		}
95
96	<	// Free an RcontribMod
96	>	// Free an RcontribMod (public for RcontribSimulManager constructor)
97		void
98		FreeRcMod(void *p)
99		{
100		if (!p) return;
101	<	epfree((*(RcontribMod *)p).binv, true);
101	>	EPNODE *        bep = (*(RcontribMod *)p).binv;
102	>	if (bep) epfree(bep, true);
103		efree(p);
104		}
105
106	+	// Get format identifier
107	+	const char *
108	+	formstr(int f)
109	+	{
110	+	switch (f) {
111	+	case 'a': return("ascii");
112	+	case 'f': return("float");
113	+	case 'd': return("double");
114	+	case 'c': return(NCSAMP==3 ? COLRFMT : SPECFMT);
115	+	}
116	+	return("unknown");
117	+	}
118	+
119	+	// Standard file data share function
120	+	RdataShare *
121	+	fileDataShare(const char *name, RCOutputOp op, size_t siz)
122	+	{
123	+	if (op == RCOrecover && access(name, R_OK|W_OK) < 0) {
124	+	sprintf(errmsg, "cannot recover from '%s'", name);
125	+	error(SYSTEM, errmsg);
126	+	return NULL;
127	+	}
128	+	RdataShare *    rds = new RdataShareFile(name, RSDOflags[op],
129	+	siz*(op != RCOforce));
130	+
131	+	if (!rds || (op == RCOforce && rds->Resize(siz) < siz)) {
132	+	delete rds;
133	+	sprintf(errmsg, "cannot create %lu byte output file '%s'",
134	+	(unsigned long)siz, name);
135	+	error(SYSTEM, errmsg);
136	+	return NULL;
137	+	}
138	+	return rds;
139	+	}
140	+
141	+	// Memory-mapped data share function
142	+	RdataShare *
143	+	mapDataShare(const char *name, RCOutputOp op, size_t siz)
144	+	{
145	+	if (op == RCOrecover && access(name, R_OK|W_OK) < 0) {
146	+	sprintf(errmsg, "cannot recover from '%s'", name);
147	+	error(SYSTEM, errmsg);
148	+	return NULL;
149	+	}
150	+	RdataShare *    rds = new RdataShareMap(name, RSDOflags[op],
151	+	siz*(op != RCOforce));
152	+
153	+	if (!rds || (op == RCOforce && rds->Resize(siz) < siz)) {
154	+	delete rds;
155	+	sprintf(errmsg, "cannot create %lu byte output map '%s'",
156	+	(unsigned long)siz, name);
157	+	error(SYSTEM, errmsg);
158	+	return NULL;
159	+	}
160	+	return rds;
161	+	}
162	+
163		// Set output format ('f', 'd', or 'c')
164		bool
165		RcontribSimulManager::SetDataFormat(int ty)
#	Line 133 | Line 203 | RcontribSimulManager::RctCall(RAY *r, void *cd)
203		if (!mp)
204		return 0;               // not in our modifier list
205
206	<	worldfunc(RCCONTEXT, r);        // compute bin #
207	<	set_eparams(mp->params);
208	<	double          bval = evalue(mp->binv);
209	<	if (bval <= -.5)
210	<	return 0;       // silently ignore negative bin index
211	<	DCOLORV *       dvp = (*mp)[int(bval + .5)];
206	>	if (rcp->HasFlag(RCcontrib) && sintens(r->rcol) <= FTINY)
207	>	return 0;               // zero contribution
208	>
209	>	int                     bi = 0; // get bin index
210	>	if (mp->binv) {
211	>	worldfunc(RCCONTEXT, r);
212	>	set_eparams(mp->params);
213	>	double          bval = evalue(mp->binv);
214	>	if (bval <= -.5)
215	>	return 0;       // silently ignore negative bin index
216	>	bi = int(bval + .5);
217	>	}
218	>	DCOLORV *       dvp = (*mp)[bi];
219		if (!dvp) {
220	<	sprintf(errmsg, "bad bin number for '%s' (%.1f ignored)", mname, bval);
220	>	sprintf(errmsg, "bad bin number for '%s' (%d ignored)", mname, bi);
221		error(WARNING, errmsg);
222		return 0;
223		}
224		SCOLOR          contr;
225		raycontrib(contr, r, PRIMARY);          // compute coefficient
226	<	if (contrib)
226	>	if (rcp->HasFlag(RCcontrib))
227		smultscolor(contr, r->rcol);    // -> value contribution
228	+
229		for (int i = 0; i < NCSAMP; i++)
230		*dvp++ += contr[i];             // accumulate color/spectrum
231		return 1;
#	Line 176 | Line 254 | bool
254		RcontribSimulManager::AddModifier(const char *modn, const char *outspec,
255		const char *prms, const char *binval, int bincnt)
256		{
257	<	if (!modn | !outspec | (bincnt <= 0) || !*modn | !*outspec) {
257	>	if (!modn | !outspec || !*modn | !*outspec) {
258		error(WARNING, "ignoring bad call to AddModifier()");
259		return false;
260		}
261	+	if (*outspec == '!') {
262	+	error(USER, "command output not supported by RcontribSimulManager");
263	+	return false;
264	+	}
265		if (!nChan) {                           // initial call?
266	+	if ((xres < 0) | (yres <= 0)) {
267	+	error(USER, "xres, yres must be set before first modifier");
268	+	return false;
269	+	}
270		if (!SetDataFormat(dtyp))
271		return false;
272		nChan = NCSAMP;
273		} else if (nChan != NCSAMP) {
274	<	error(INTERNAL, "number of spectral channels must be fixed");
274	>	error(USER, "# spectral channels must be fixed in AddModifier()");
275		return false;
276		}
277		if (Ready()) {
#	Line 208 | Line 294 | RcontribSimulManager::AddModifier(const char *modn, co
294		const int       binndx = hasFormat(outspec, "diouxX");
295		int             bin0 = 0;
296		char            fnbuf[512];
297	<	if (!modndx | (modndx > binndx))
297	>	if (!modndx || (binndx > 0) & (modndx > binndx))
298		sprintf(fnbuf, outspec, bin0, modn);
299		else
300		sprintf(fnbuf, outspec, modn, bin0);
#	Line 237 | Line 323 | RcontribSimulManager::AddModifier(const char *modn, co
323		mp->opl = op;                   // first (maybe only) output channel
324		if (modndx)                     // remember modifier if part of name
325		op->omod = lp->key;
326	<	if (binndx > 0) {               // append output image/bin list
326	>	if (binndx) {                   // append output image/bin list
327		op->rowBytes += dsiz;
328		op->obin = bin0;
329		for (bincnt = 1; bincnt < mp->nbins; bincnt++) {
330	<	if (!modndx | (modndx > binndx))
330	>	if (!modndx || (binndx > 0) &  (modndx > binndx))
331		sprintf(fnbuf, outspec, bin0+bincnt, modn);
332		else
333		sprintf(fnbuf, outspec, modn, bin0+bincnt);
#	Line 260 | Line 346 | RcontribSimulManager::AddModifier(const char *modn, co
346		op->rowBytes += dsiz;
347		}
348		} else                          // else send all results to this channel
349	<	op->rowBytes += bincnt*dsiz;
349	>	op->rowBytes += mp->nbins*dsiz;
350		return true;
351		}
352
#	Line 281 | Line 367 | RcontribSimulManager::AddModFile(const char *modfn, co
367		}
368		char            mod[MAXSTR];
369		while (fgetword(mod, sizeof(mod), fp))
370	<	if (!AddModifier(mod, outspec, prms, binval, bincnt))
370	>	if (!AddModifier(mod, outspec, prms, binval, bincnt)) {
371	>	fclose(fp);
372		return false;
373	+	}
374		fclose(fp);
375		return true;
376		}
377
378	<	// Run through current list of output struct's
379	<	int
380	<	RcontribSimulManager::GetOutputs(RoutputShareF *osF, void *cd) const
378	>	// call-back to check if modifier has been loaded
379	>	static int
380	>	checkModExists(const LUENT *lp, void *p)
381		{
382	<	int     cnt = 0;
382	>	OBJECT  mod = modifier(lp->key);
383
384	<	for (const RcontribOutput *op = outList; op; op = op->next) {
385	<	int     rv = 1;
386	<	if (osF && (rv = (*osF)(op, cd)) < 0)
387	<	return rv;
388	<	cnt += rv;
389	<	}
302	<	return cnt;
384	>	if ((mod != OVOID) & (mod < nsceneobjs))
385	>	return 1;
386	>
387	>	sprintf(errmsg, "tracked modifier '%s' not found in main scene", lp->key);
388	>	error(WARNING, errmsg);
389	>	return 0;
390		}
391
392		// Prepare output channels and return # completed rows
#	Line 307 | Line 394 | int
394		RcontribSimulManager::PrepOutput()
395		{
396		if (!outList || !RtraceSimulManager::Ready()) {
397	<	error(INTERNAL, "PrepOutput() called before octree & modifiers assigned");
397	>	error(INTERNAL, "PrepOutput() called before octree & modifiers set");
398		return -1;
399		}
400	+	if (!cdsF) {
401	+	error(INTERNAL, "missing RdataShare constructor call (cdsF)");
402	+	return -1;
403	+	}
404	+	if (lu_doall(&modLUT, checkModExists, NULL) < 0)
405	+	return -1;
406	+
407	+	outList->nRows = yres * (xres + !xres); // all outputs have same #rows
408		int     remWarnings = 20;
409		for (RcontribOutput *op = outList; op; op = op->next) {
410		if (op->rData) {
411		error(INTERNAL, "output channel already open in PrepOutput()");
412		return -1;
413		}
414	<	op->nRows = yres * (xres + !xres);
414	>	op->nRows = outList->nRows;
415		op->rData = (*cdsF)(op->ofname, outOp,
416		GetHeadLen()+1024 + op->nRows*op->rowBytes);
417		freeqstr(op->ofname); op->ofname = NULL;
#	Line 325 | Line 420 | RcontribSimulManager::PrepOutput()
420		if (rd < 0)
421		return -1;
422		if (rd >= op->nRows) {
423	<	if (remWarnings >= 0) {
424	<	sprintf(errmsg, "recovered output '%s' already done",
423	>	if (remWarnings > 0) {
424	>	sprintf(errmsg, "recovered output '%s' is complete",
425		op->GetName());
426	<	error(WARNING, remWarnings ? errmsg : "etc...");
332	<	remWarnings--;
426	>	error(WARNING, --remWarnings ? errmsg : "etc...");
427		}
428		rd = op->nRows;
429		}
#	Line 341 | Line 435 | RcontribSimulManager::PrepOutput()
435		!op->rData->Resize(op->begData + op->nRows*op->rowBytes))
436		return -1;              // calls error() for us
437		}
344	–	if (lim_dist)                           // XXX where else to put this?
345	–	rtFlags |= RTlimDist;
346	–	else
347	–	rtFlags &= ~RTlimDist;
348	–
438		rowsDone.NewBitMap(outList->nRows);     // create row completion map
439		rowsDone.ClearBits(0, rInPos, true);
440	<	return rInPos;
440	>	return nrDone = rInPos;
441		}
442
443		// Create header in open write-only channel
#	Line 376 | Line 465 | RcontribOutput::NewHeader(const RcontribSimulManager *
465		strcpy(hdr+begData, ROWZEROSTR);
466		rowCountPos = begData+LNROWSTR;
467		begData += sizeof(ROWZEROSTR)-1;
468	<	if (!xres | (rowBytes > esiz)) {
468	>	if (!rcp->xres | (rowBytes > esiz)) {
469		sprintf(hdr+begData, "NCOLS=%d\n", int(rowBytes/esiz));
470		begData += strlen(hdr+begData);
471		}
472		sprintf(hdr+begData, "%s%d\n", NCOMPSTR, NCSAMP);
473		begData += strlen(hdr+begData);
474		if (NCSAMP > 3) {
475	<	sprintf(hdr+begData, "%s %f %f %f %f\n", WLSPLTSTR,
475	>	sprintf(hdr+begData, "%s %g %g %g %g\n", WLSPLTSTR,
476		WLPART[0], WLPART[1], WLPART[2], WLPART[3]);
477		begData += strlen(hdr+begData);
478		}
#	Line 414 | Line 503 | RcontribOutput::NewHeader(const RcontribSimulManager *
503		hdr[begData++] = ' ';
504		hdr[begData++] = '\n';          // EOL for data format
505		hdr[begData++] = '\n';          // end of nominal header
506	<	if ((xres > 0) & (rowBytes == esiz)) {  // tack on resolution string?
507	<	sprintf(hdr+begData, PIXSTDFMT, yres, xres);
506	>	if ((rcp->xres > 0) & (rowBytes == esiz)) {     // tack on resolution string?
507	>	sprintf(hdr+begData, PIXSTDFMT, rcp->yres, rcp->xres);
508		begData += strlen(hdr+begData);
509		}
510		return rData->ReleaseMemory(hdr, RDSwrite);
#	Line 461 | Line 550 | RcontribOutput::CheckHeader(const RcontribSimulManager
550		return -1;
551		}
552		// check format
553	<	if (!(cp = findArgs(hdr, FMTSTR, begData)) || strcmp(cp, formstr(etyp))) {
553	>	if (!(cp = findArgs(hdr, FMTSTR, begData)) ||
554	>	strncmp(cp, formstr(etyp), strlen(formstr(etyp)))) {
555		sprintf(errmsg, "expected %s%s in '%s'", FMTSTR, formstr(etyp), GetName());
556		error(USER, errmsg);
557		return -1;
558		}
559		// check #columns
560	<	if (((cp = findArgs(hdr, "NCOLS=", begData)) && atoi(cp)*esiz != rowBytes) ||
561	<	!xres | (rowBytes > esiz)) {
562	<	sprintf(errmsg, "expected NCOLS=%d in '%s'",
473	<	int(rowBytes/esiz), GetName());
560	>	if ((cp = findArgs(hdr, "NCOLS=", begData)) ? (atoi(cp)*esiz != rowBytes)
561	>	: (!rcp->xres | (rowBytes > esiz))) {
562	>	sprintf(errmsg, "expected NCOLS=%d in '%s'", int(rowBytes/esiz), GetName());
563		error(USER, errmsg);
564		return -1;
565		}
#	Line 483 | Line 572 | RcontribOutput::CheckHeader(const RcontribSimulManager
572		rowCountPos = cp - hdr;
573		int     rlast = atoi(cp);
574		begData++;                              // advance past closing EOL
575	<	if ((xres > 0) & (rowBytes == esiz)) {  // check/skip resolution string?
575	>	if ((rcp->xres > 0) & (rowBytes == esiz)) {     // check/skip resolution string?
576		char    rbuf[64];
577	<	sprintf(rbuf, PIXSTDFMT, yres, xres);
577	>	sprintf(rbuf, PIXSTDFMT, rcp->yres, rcp->xres);
578		int     rlen = strlen(rbuf);
579		if (strncmp(rbuf, hdr+begData, rlen)) {
580		sprintf(errmsg, "bad resolution string in '%s'", GetName());
#	Line 512 | Line 601 | RcontribSimulManager::ResetRow(int r)
601		return false;
602
603		rowsDone.ClearBits(r, rInPos-r, false);
604	<	rInPos = r;
604	>	nrDone = rInPos = r;
605		return true;
606		}
607
#	Line 559 | Line 648 | putModContrib(const LUENT *lp, void *p)
648		}
649		} break;
650		default:
651	<	error(CONSISTENCY, "unsupported output type in sendModContrib()");
651	>	error(CONSISTENCY, "unsupported output type in putModContrib()");
652		return -1;
653		}
654		// clear for next tally
#	Line 578 | Line 667 | RcontribSimulManager::ComputeRecord(const FVECT orig_d
667		return 0;
668		}
669		if (nkids > 0) {                        // in parent process?
670	<	int     k = GetChild();         // updates output rows
671	<	if (k < 0) return -1;           // can't really happen
670	>	int     k = GetChild(false);    // updates output rows
671	>	if (k < 0) return -1;           // someone died?
672		RowAssignment   rass;
673		rass.row = kidRow[k] = rInPos++;
674		rass.ac = accum;
#	Line 624 | Line 713 | RcontribSimulManager::GetChild(bool forceWait)
713		return -1;
714		// take inventory
715		int     pn, n = 0;
716	<	fd_set  writeset, errset;
717	<	FD_ZERO(&writeset); FD_ZERO(&errset);
716	>	fd_set  readset, errset;
717	>	FD_ZERO(&readset); FD_ZERO(&errset);
718		for (pn = nkids; pn--; ) {
719		if (kidRow[pn] < 0) {           // child already ready?
720		if (forceWait) continue;
721		return pn;              // good enough
722		}
723	<	FD_SET(kid[pn].w, &writeset);   // will check on this one
724	<	FD_SET(kid[pn].w, &errset);
725	<	if (kid[pn].w >= n)
726	<	n = kid[pn].w + 1;
723	>	FD_SET(kid[pn].r, &readset);    // will check on this one
724	>	FD_SET(kid[pn].r, &errset);
725	>	if (kid[pn].r >= n)
726	>	n = kid[pn].r + 1;
727		}
728		if (!n)                                 // every child is idle?
729		return -1;
730		// wait on "busy" child(ren)
731	<	while ((n = select(n, NULL, &writeset, &errset, NULL)) <= 0)
731	>	while ((n = select(n, &readset, NULL, &errset, NULL)) <= 0)
732		if (errno != EINTR) {
733		error(SYSTEM, "select call failed in GetChild()");
734		return -1;
735		}
736	+	char    buf[sizeof(ROW_DONE)] = "X";
737		pn = -1;                                // get flags set by select
738		for (n = nkids; n--; )
739		if (kidRow[n] >= 0 &&
740	<	FD_ISSET(kid[n].w, &writeset) |
741	<	FD_ISSET(kid[n].w, &errset)) {
740	>	FD_ISSET(kid[n].r, &readset) |
741	>	FD_ISSET(kid[n].r, &errset)) {
742	>	// check for error
743	>	if (FD_ISSET(kid[n].r, &errset) ||
744	>	read(kid[n].r, buf, sizeof(ROW_DONE)) <= 0 ||
745	>	memcmp(buf, ROW_DONE, sizeof(ROW_DONE)))
746	>	return -1;
747		// update output row counts
748		UpdateRowsDone(kidRow[n]);
749	<	kidRow[n] = -1;         // flag it available
749	>	kidRow[n] = -1;         // flag child available
750		pn = n;
751		}
752		return pn;
#	Line 665 | Line 760 | RcontribSimulManager::UpdateRowsDone(int r)
760		error(WARNING, "redundant call to UpdateRowsDone()");
761		return false;
762		}
763	<	int     nDone = GetRowFinished();
764	<	if (nDone <= r)
763	>	GetRowFinished();
764	>	if (nrDone <= r)
765		return true;                    // nothing to update, yet
766		for (RcontribOutput *op = outList; op; op = op->next)
767	<	if (!op->SetRowsDone(nDone))
767	>	if (!op->SetRowsDone(nrDone))
768		return false;
769		return true;                            // up-to-date
770		}
#	Line 689 | Line 784 | RcontribSimulManager::RunChild()
784		error(CONSISTENCY, "bad accumulator count in child");
785		exit(1);
786		}
787	<	if (rass.ac > accum)
788	<	vecList = (FVECT *)erealloc(vecList,
789	<	sizeof(FVECT)*2*rass.ac);
787	>	if (rass.ac > accum) {
788	>	efree(vecList);
789	>	vecList = (FVECT *)emalloc(sizeof(FVECT)*2*rass.ac);
790	>	}
791		accum = rass.ac;
792		rInPos = rass.row;
793
#	Line 701 | Line 797 | RcontribSimulManager::RunChild()
797
798		if (ComputeRecord(vecList) <= 0)
799		exit(1);
800	+	// signal this row is done
801	+	if (write(1, ROW_DONE, sizeof(ROW_DONE)) != sizeof(ROW_DONE))
802	+	exit(1);
803		}
804		if (nr) {
805		error(SYSTEM, "read error in child process");
#	Line 726 | Line 825 | RcontribSimulManager::StartKids(int n2go)
825		fflush(stdout);                         // shouldn't use, anyway
826		while (nkids < n2go) {
827		kid[nkids] = sp_inactive;
729	–	kid[nkids].w = dup(1);
730	–	kid[nkids].flags |= PF_FILT_OUT;
828		int     rv = open_process(&kid[nkids], NULL);
829		if (!rv) {                      // in child process?
830	<	while (nkids-- > 0)
830	>	while (nkids-- > 0) {
831	>	close(kid[nkids].r);
832		close(kid[nkids].w);
833	+	}
834		free(kid); free(kidRow);
835		kid = NULL; kidRow = NULL;
737	–	rowsDone.NewBitMap(0);
836		RunChild();             // should never return
837		_exit(1);
838		}
#	Line 783 | Line 881 | RcontribSimulManager::SetThreadCount(int nt)
881		return 0;
882		}
883		if (nt < 0)
884	<	return nkids;
884	>	return NThreads();
885		if (!nt) nt = GetNCores();
886		int     status = 0;
887		if (nt == 1)
#	Line 796 | Line 894 | RcontribSimulManager::SetThreadCount(int nt)
894		sprintf(errmsg, "non-zero (%d) status from child", status);
895		error(WARNING, errmsg);
896		}
897	<	return nkids;
897	>	return NThreads();
898		}

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