Bug 782183 - Add some code to the robocop harness to dump all stack traces in case of hanging/deadlock. r=gbrown

build/mobile/robocop/FennecNativeDriver.java.in

@@ -18,6 +18,7 @@ import java.io.PrintWriter;
 import java.nio.IntBuffer;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 import java.lang.Class;
 import java.lang.reflect.InvocationTargetException;
@@ -422,6 +423,20 @@ public class FennecNativeDriver implements Driver {
         return retVal;
     }
 
+    public static void logAllStackTraces(LogLevel level) {
+        StringBuffer sb = new StringBuffer();
+        sb.append("Dumping ALL the threads!\n");
+        Map<Thread, StackTraceElement[]> allStacks = Thread.getAllStackTraces();
+        for (Thread t : allStacks.keySet()) {
+            sb.append(t.toString()).append('\n');
+            for (StackTraceElement ste : allStacks.get(t)) {
+                sb.append(ste.toString()).append('\n');
+            }
+            sb.append('\n');
+        }
+        log(level, sb.toString());
+    }
+
     /** 
      *  Set the filename used for logging. If the file already exists, delete it
      *  as a safe-guard against accidentally appending to an old log file.

build/mobile/robocop/FennecNativeElement.java.in

@@ -69,6 +69,7 @@ public class FennecNativeElement implements Element {
             if (syncQueue.poll(MAX_WAIT_MS, TimeUnit.MILLISECONDS) == null) {
                 FennecNativeDriver.log(FennecNativeDriver.LogLevel.ERROR, 
                     "click: time-out waiting for UI thread");
+                FennecNativeDriver.logAllStackTraces(FennecNativeDriver.LogLevel.ERROR);
             }
         } catch (InterruptedException e) {
             FennecNativeDriver.log(FennecNativeDriver.LogLevel.ERROR, e);
@@ -121,6 +122,7 @@ public class FennecNativeElement implements Element {
             if (syncQueue.poll(MAX_WAIT_MS, TimeUnit.MILLISECONDS) == null) {
                 FennecNativeDriver.log(FennecNativeDriver.LogLevel.ERROR, 
                     "getText: time-out waiting for UI thread");
+                FennecNativeDriver.logAllStackTraces(FennecNativeDriver.LogLevel.ERROR);
             }
         } catch (InterruptedException e) {
             FennecNativeDriver.log(FennecNativeDriver.LogLevel.ERROR, e);
@@ -157,6 +159,7 @@ public class FennecNativeElement implements Element {
             if (syncQueue.poll(MAX_WAIT_MS, TimeUnit.MILLISECONDS) == null) {
                 FennecNativeDriver.log(FennecNativeDriver.LogLevel.ERROR, 
                     "isDisplayed: time-out waiting for UI thread");
+                FennecNativeDriver.logAllStackTraces(FennecNativeDriver.LogLevel.ERROR);
             }
         } catch (InterruptedException e) {
             FennecNativeDriver.log(FennecNativeDriver.LogLevel.ERROR, e);