Add option to set minimum value of accepted work

If the available work is not above some minimum value, put the miner to
sleep.
Also, changed the total value display to use the already calculated
value in the pubkeybatch_t.

oclvanityminer.c

@@ -770,7 +770,8 @@ usage(const char *name)
 "-t <threads>  Set target thread count per multiprocessor\n"
 "-g <x>x<y>    Set grid size\n"
 "-b <invsize>  Set modular inverse ops per thread\n"
-"-V            Enable kernel/OpenCL/hardware verification (SLOW)\n",
+"-V            Enable kernel/OpenCL/hardware verification (SLOW)\n"
+"-m <minvalue> Set minimum value (in BTC/Gkey) for the miner to accept work\n",
 version, name);
 }
 
@@ -792,6 +793,7 @@ main(int argc, char **argv)
 	int invsize = 0;
 	int verify_mode = 0;
 	int safe_mode = 0;
+	float min_value = 0;
 
 	char *devstrs[MAX_DEVS];
 	int ndevstrs = 0;
@@ -802,7 +804,6 @@ main(int argc, char **argv)
 	int res;
 	int thread_started = 0;
 	pubkeybatch_t *active_pkb = NULL;
-	float active_pkb_value = 0;
 
 	server_context_t *scp = NULL;
 	pubkeybatch_t *pkb;
@@ -820,7 +821,7 @@ main(int argc, char **argv)
 	}
 
 	while ((opt = getopt(argc, argv,
-			     "u:a:vqp:d:w:t:g:b:VD:Sh?i:")) != -1) {
+			     "u:a:vqp:d:w:t:g:b:VD:Sh?i:m:")) != -1) {
 		switch (opt) {
 		case 'u':
 			url = optarg;
@@ -906,6 +907,9 @@ main(int argc, char **argv)
 			}
 			devstrs[ndevstrs++] = optarg;
 			break;
+		case 'm':
+			min_value = atof(optarg);
+			break;
 		default:
 			usage(argv[0]);
 			return 1;
@@ -986,7 +990,14 @@ main(int argc, char **argv)
 			server_context_getwork(scp);
 
 		pkb = most_valuable_pkb(scp);
-
+
+		if( pkb->total_value < min_value ) {
+			fprintf(stderr,
+				"Value of current work (%f BTC/Gkey) does not meet minimum value (%f BTC/Gkey)\n",
+				pkb->total_value, min_value);
+			pkb = NULL;
+		}
+
 		/* If the work item is the same as the one we're executing,
 		   keep it */
 		if (pkb && active_pkb &&
@@ -1017,7 +1028,6 @@ main(int argc, char **argv)
 		} else if (!active_pkb) {
 			workitem_t *wip;
 			was_sleeping = 0;
-			active_pkb_value = 0;
 			vcp->vc_pubkey_base = pkb->pubkey;
 			for (wip = workitem_avl_first(&pkb->items);
 			     wip != NULL;
@@ -1035,16 +1045,14 @@ main(int argc, char **argv)
 					fprintf(stderr,
 					   "WARNING: could not add pattern\n");
 				}
-				else {
-					active_pkb_value += wip->value;
-				}
 
 				assert(vcp->vc_npatterns);
 			}
 
 			fprintf(stderr, 
 				"\nTotal value for current work: %f BTC/Gkey\n", 
-				active_pkb_value);
+				pkb->total_value);
+
 			res = vg_context_start_threads(vcp);
 			if (res)
 				return 1;