use System.exit() to force exit because RXTX spawns a non-daemon thread

[eltron.git] / src / com / megacz / eltron / Eltron.java

diff --git a/src/com/megacz/eltron/Eltron.java b/src/com/megacz/eltron/Eltron.java
index 33c090b..d59e73c 100644 (file)
--- a/src/com/megacz/eltron/Eltron.java
+++ b/src/com/megacz/eltron/Eltron.java
@@ -6,12 +6,30 @@ import java.io.*;
 import java.util.*;
 import gnu.io.*;
 
+/*
+
+If you're on a mac and you get the error below, you need to create
+/var/lock and make it writable.
+
+Exception in thread "main" gnu.io.PortInUseException: No such file or directory in open
+at gnu.io.RXTXPort.open(Native Method)
+at gnu.io.RXTXPort.<init>(RXTXPort.java:84)
+at com.megacz.eltron.Eltron.detectPort(Eltron.java:26)
+at com.megacz.eltron.Eltron.print(Eltron.java:37)
+at com.megacz.eltron.Eltron.main(Eltron.java:14)
+
+
+ */
+
 /** code to control an Eltron */
 public class Eltron {
 
     public static void main(String[] s) throws Exception {
         Picture p = new Picture(System.in);
         print(p.data, p.width, p.height);
+
+        // RXTX spawns a thread that never dies
+        System.exit(0);
     }
 
     public static SerialPort detectPort() throws Exception {
@@ -35,8 +53,11 @@ public class Eltron {
 
         // you'll need to run this once at 9600 to tell the built-in eeprom to switch to 38,400kbps
         //sp.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
+
+
         sp.setSerialPortParams(38400, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
 
+
         OutputStream out = sp.getOutputStream();
         InputStream in = sp.getInputStream();
         int count = 0;