Avoid multiple concurrent compile/upload operations

Disable Compile/Run buttons as they get press, and reenable only on function exit.
The launched upload process has now a 2minutes timeout before being terminated forcefully.
10 second after pressing "Upload" the button comes pressable again, but this time the previous upload command gets killed explicitely

app/src/processing/app/Editor.java

@@ -143,6 +143,8 @@ public boolean test(Sketch sketch) {
 
   private int numTools = 0;
 
+  public boolean avoidMultipleOperations = false;
+
   private final EditorToolbar toolbar;
   // these menus are shared so that they needn't be rebuilt for all windows
   // each time a sketch is created, renamed, or moved.
@@ -195,7 +197,7 @@ public boolean test(Sketch sketch) {
   private Runnable stopHandler;
   Runnable exportHandler;
   private Runnable exportAppHandler;
-
+  private Runnable timeoutUploadHandler;
 
   public Editor(Base ibase, File file, int[] storedLocation, int[] defaultLocation, Platform platform) throws Exception {
     super("Arduino");
@@ -1677,6 +1679,7 @@ private void resetHandlers() {
     stopHandler = new DefaultStopHandler();
     exportHandler = new DefaultExportHandler();
     exportAppHandler = new DefaultExportAppHandler();
+    timeoutUploadHandler = new TimeoutUploadHandler();
   }
 
 
@@ -2008,6 +2011,7 @@ public void run() {
 
       status.unprogress();
       toolbar.deactivateRun();
+      avoidMultipleOperations = false;
     }
   }
 
@@ -2396,6 +2400,7 @@ synchronized public void handleExport(final boolean usingProgrammer) {
     console.clear();
     status.progress(tr("Uploading to I/O Board..."));
 
+    new Thread(timeoutUploadHandler).start();
     new Thread(usingProgrammer ? exportAppHandler : exportHandler).start();
   }
 
@@ -2435,6 +2440,7 @@ public void run() {
         e.printStackTrace();
       } finally {
         populatePortMenu();
+        avoidMultipleOperations = false;
       }
       status.unprogress();
       uploading = false;
@@ -2529,6 +2535,7 @@ public void run() {
       } catch (Exception e) {
         e.printStackTrace();
       } finally {
+        avoidMultipleOperations = false;
         populatePortMenu();
       }
       status.unprogress();
@@ -2543,6 +2550,20 @@ public void run() {
     }
   }
 
+  class TimeoutUploadHandler implements Runnable {
+
+    public void run() {
+      try {
+        //10 seconds, than reactivate upload functionality and let the programmer pid being killed
+        Thread.sleep(1000 * 10);
+        if (uploading) {
+          avoidMultipleOperations = false;
+        }
+      } catch (InterruptedException e) {
+          // noop
+      }
+    }
+  }
 
   public void handleSerial() {
     if(serialPlotter != null) {
@@ -2587,7 +2608,7 @@ public void handleSerial() {
 
     // If currently uploading, disable the monitor (it will be later
     // enabled when done uploading)
-    if (uploading) {
+    if (uploading || avoidMultipleOperations) {
       try {
         serialMonitor.suspend();
       } catch (Exception e) {
@@ -2611,8 +2632,10 @@ public void handleSerial() {
       }
 
       try {
-        serialMonitor.open();
         serialMonitor.setVisible(true);
+        if (!avoidMultipleOperations) {
+          serialMonitor.open();
+        }
         success = true;
       } catch (ConnectException e) {
         statusError(tr("Unable to connect: is the sketch using the bridge?"));

app/src/processing/app/EditorToolbar.java

@@ -337,7 +337,10 @@ public void mousePressed(MouseEvent e) {
 
     switch (sel) {
       case RUN:
-        editor.handleRun(false, editor.presentHandler, editor.runHandler);
+        if (!editor.avoidMultipleOperations) {
+          editor.handleRun(false, editor.presentHandler, editor.runHandler);
+          editor.avoidMultipleOperations = true;
+        }
         break;
 
 //    case STOP:
@@ -366,7 +369,11 @@ public void mousePressed(MouseEvent e) {
         break;
 
       case EXPORT:
-        editor.handleExport(e.isShiftDown());
+        // launch a timeout timer which can reenable to upload button functionality an
+        if (!editor.avoidMultipleOperations) {
+          editor.handleExport(e.isShiftDown());
+          editor.avoidMultipleOperations = true;
+        }
         break;
 
       case SERIAL:

arduino-core/src/cc/arduino/packages/Uploader.java

@@ -44,6 +44,7 @@
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
+import java.util.concurrent.TimeUnit;
 
 import static processing.app.I18n.tr;
 
@@ -102,6 +103,9 @@ public String getAuthorizationKey() {
     return null;
   }
 
+  // static field for last executed programmer process ID
+  static protected Process programmerPid;
+
   protected boolean executeUploadCommand(Collection<String> command) throws Exception {
     return executeUploadCommand(command.toArray(new String[command.size()]));
   }
@@ -121,11 +125,16 @@ protected boolean executeUploadCommand(String command[]) throws Exception {
         System.out.println();
       }
       Process process = ProcessUtils.exec(command);
+      programmerPid = process;
       new MessageSiphon(process.getInputStream(), this, 100);
       new MessageSiphon(process.getErrorStream(), this, 100);
 
-      // wait for the process to finish.
-      result = process.waitFor();
+      // wait for the process to finish, but not forever
+      // kill the flasher process after 2 minutes to avoid 100% cpu spinning
+      if (!process.waitFor(2, TimeUnit.MINUTES)) {
+        process.destroyForcibly();
+      }
+      result = process.exitValue();
     } catch (Exception e) {
       e.printStackTrace();
     }

arduino-core/src/cc/arduino/packages/uploaders/SerialUploader.java

@@ -78,6 +78,11 @@ public boolean uploadUsingPreferences(File sourcePath, String buildPath, String
     }
     prefs.putAll(targetPlatform.getTool(tool));
 
+    if (programmerPid != null && programmerPid.isAlive()) {
+      // kill the previous programmer
+      programmerPid.destroyForcibly();
+    }
+
     // if no protocol is specified for this board, assume it lacks a 
     // bootloader and upload using the selected programmer.
     if (usingProgrammer || prefs.get("upload.protocol") == null) {
@@ -134,7 +139,7 @@ public boolean uploadUsingPreferences(File sourcePath, String buildPath, String
           // Scanning for available ports seems to open the port or
           // otherwise assert DTR, which would cancel the WDT reset if
           // it happened within 250 ms. So we wait until the reset should
-          // have already occured before we start scanning.
+          // have already occurred before we start scanning.
           actualUploadPort = waitForUploadPort(userSelectedUploadPort, before);
         }
       } catch (SerialException e) {
@@ -213,6 +218,7 @@ public boolean uploadUsingPreferences(File sourcePath, String buildPath, String
       finalUploadPort = userSelectedUploadPort;
     }
     BaseNoGui.selectSerialPort(finalUploadPort);
+
     return uploadResult;
   }