diff -r 2d97ea5e711a -r d8d596d26f25 src/raytracer.cc
--- a/src/raytracer.cc	Sat Nov 17 17:47:06 2007 +0100
+++ b/src/raytracer.cc	Sun Nov 18 11:20:56 2007 +0100
@@ -205,6 +205,7 @@
 #ifdef PTHREADS
 	pthread_exit((void *)d);
 #endif
+	return (void *)d;
 }
 
 float *Raytracer::render(int w, int h)
@@ -229,11 +230,11 @@
 	vy = starty;
 
 #ifdef PTHREADS
-	int num_threads = 20;
+	int num_threads = 2;
 	printf("* pthreads enabled, using %d threads\n", num_threads);
 	pthread_t threads[num_threads];
 	for (int t = 0; t < num_threads; t++)
-		threads[t] = 0;
+		threads[t] = pthread_self();
 	int t = 0;
 #endif
 
@@ -260,7 +261,7 @@
 			t = 0;
 		/* wait for next thread in fifo queue, so the descriptor can be reused;
 		   this also limits number of running threads */
-		if (threads[t] != 0)
+		if (!pthread_equal(threads[t], pthread_self()))
 			if (pthread_join(threads[t], (void**)&d) == 0)
 				free(d);
 #else