core: write gpu-threads to config when using ncurses menu.

driver-opencl.c

@@ -731,8 +731,10 @@ void manage_gpu(void)
 	char checkin[40];
 	char input;
 
-	if (!opt_g_threads)
+	if (!opt_g_threads) {
+		applog(LOG_ERR, "opt_g_threads not set in manage_gpu()");
 		return;
+	}
 
 	opt_loginput = true;
 	immedok(logwin, true);

sgminer.c

@@ -1128,7 +1128,7 @@ static struct opt_table opt_config_table[] = {
 		     set_int_0_to_9999, opt_show_intval, &opt_platform_id,
 		     "Select OpenCL platform ID to use for GPU mining"),
 #ifndef HAVE_ADL
-	OPT_WITH_ARG("--gpu-threads|-g",
+	OPT_WITH_ARG("--gpu-threads|-g", // FIXME: why is this in a conditional?
 		     set_int_1_to_10, opt_show_intval, &opt_g_threads,
 		     "Number of threads per GPU (1 - 10)"),
 #else
@@ -4220,6 +4220,11 @@ void write_config(FILE *fcfg)
 			fprintf(fcfg, "%s%d", i > 0 ? "," : "",
 				(int)gpus[i].shaders);
 
+		fputs("\",\n\"gpu-threads\" : \"", fcfg);
+		for(i = 0; i < nDevs; i++)
+			fprintf(fcfg, "%s%d", i > 0 ? "," : "",
+				(int)gpus[i].threads);
+
 #ifdef HAVE_ADL
 		fputs("\",\n\"gpu-engine\" : \"", fcfg);
 		for(i = 0; i < nDevs; i++)