frameworks/base: Implement Mutual exclusion in BroadcastReceiver

Invoke forceStopPackageLocked after acquiring a lock on
ActivityManagerService.this.

Change-Id: I75a85da03418a87c26b89360cebd3bccc6a25e46

diff --git a/services/java/com/android/server/am/ActivityManagerService.java b/services/java/com/android/server/am/ActivityManagerService.java
index db1aa4f..517f1e7 100755 (executable)
--- a/services/java/com/android/server/am/ActivityManagerService.java
+++ b/services/java/com/android/server/am/ActivityManagerService.java
@@ -3679,10 +3679,12 @@ public final class ActivityManagerService extends ActivityManagerNative
                 String[] pkgs = intent.getStringArrayExtra(Intent.EXTRA_PACKAGES);
                 if (pkgs != null) {
                     for (String pkg : pkgs) {
-                        if (forceStopPackageLocked(pkg, -1, false, false, false)) {
-                            setResultCode(Activity.RESULT_OK);
-                            return;
-                        }
+                        synchronized (ActivityManagerService.this) {
+                          if (forceStopPackageLocked(pkg, -1, false, false, false)) {
+                              setResultCode(Activity.RESULT_OK);
+                              return;
+                          }
+                       }
                     }
                 }
             }