--- ray/src/rt/raypcalls.c	2007/09/12 03:57:00	2.15
+++ ray/src/rt/raypcalls.c	2008/02/20 05:21:29	2.19
@@ -1,5 +1,5 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: raypcalls.c,v 2.15 2007/09/12 03:57:00 greg Exp $";
+static const char	RCSid[] = "$Id: raypcalls.c,v 2.19 2008/02/20 05:21:29 greg Exp $";
 #endif
 /*
  *  raypcalls.c - interface for parallel rendering using Radiance
@@ -131,13 +131,11 @@ static const char	RCSid[] = "$Id: raypcalls.c,v 2.15 2
  *  process should not be compromised.
  */
 
-#include <stdio.h>
-#include <sys/types.h>
-#include <sys/wait.h> /* XXX platform */
-
 #include  "rtprocess.h"
 #include  "ray.h"
 #include  "ambient.h"
+#include  <sys/types.h>
+#include  <sys/wait.h>
 #include  "selcall.h"
 
 #ifndef RAYQLEN
@@ -259,14 +257,14 @@ ray_pqueue(			/* queue a ray for computation */
 		return(0);
 					/* check for full send queue */
 	if (sendq_full()) {
-		RAY	mySend;
-		int	rval;
-		mySend = *r;
+		RAY	mySend = *r;
 					/* wait for a result */
-		rval = ray_presult(r, 0);
+		if (ray_presult(r, 0) <= 0)
+			return(-1);
 					/* put new ray in queue */
 		r_queue[r_send_next++] = mySend;
-		return(rval);		/* done */
+				/* XXX r_send_next may now be > RAYQLEN */
+		return(1);
 	}
 					/* else add ray to send queue */
 	r_queue[r_send_next++] = *r;
@@ -308,6 +306,9 @@ ray_presult(		/* check for a completed ray */
 		n = ray_pnprocs - ray_pnidle;
 	if (n <= 0)			/* return if nothing to await */
 		return(0);
+	if (!poll && ray_pnprocs == 1)	/* one process -> skip select() */
+		FD_SET(r_proc[0].fd_recv, &readset);
+
 getready:				/* any children waiting for us? */
 	for (pn = ray_pnprocs; pn--; )
 		if (FD_ISSET(r_proc[pn].fd_recv, &readset) ||