Index: trunk/ppImage/src/ppImageArguments.c
===================================================================
--- trunk/ppImage/src/ppImageArguments.c	(revision 16844)
+++ trunk/ppImage/src/ppImageArguments.c	(revision 18895)
@@ -78,4 +78,16 @@
     }
 
+    // Number of threads
+    if ((argnum = psArgumentGet(argc, argv, "-threads"))) {
+        psArgumentRemove(argnum, &argc, argv);
+	int nThreads = atoi(argv[argnum]);
+        psMetadataAddS32(config->arguments, PS_LIST_TAIL, "NTHREADS", 0, "number of warp threads", nThreads);
+        psArgumentRemove(argnum, &argc, argv);
+
+	// create the thread pool with number of desired threads, supplying our thread launcher function
+	// XXX need to determine the number of threads from the config data
+	psThreadPoolInit (nThreads);
+    }
+
     // the following options override the PPIMAGE recipe options