Merge "Start combining threads in system process."

1 files changed, 65 insertions, 0 deletions

diff --git a/services/java/com/android/server/FgThread.java b/services/java/com/android/server/FgThread.java
new file mode 100644
index 000000000000..3b655f2cee93
--- /dev/null
+++ b/services/java/com/android/server/FgThread.java
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server;
+
+import android.os.Handler;
+import android.os.HandlerThread;
+
+/**
+ * Shared singleton foreground thread for the system.  This is a thread for regular
+ * foreground service operations, which shouldn't be blocked by anything running in
+ * the background.  In particular, the shared background thread could be doing
+ * relatively long-running operations like saving state to disk (in addition to
+ * simply being a background priority), which can cause operations scheduled on it
+ * to be delayed for a user-noticeable amount of time.
+ */
+public final class FgThread extends HandlerThread {
+    private static FgThread sInstance;
+    private static Handler sHandler;
+
+    private FgThread() {
+        super("android.fg", android.os.Process.THREAD_PRIORITY_DEFAULT);
+    }
+
+    private static void ensureThreadLocked() {
+        if (sInstance == null) {
+            sInstance = new FgThread();
+            sInstance.start();
+            sHandler = new Handler(sInstance.getLooper());
+            sHandler.post(new Runnable() {
+                @Override
+                public void run() {
+                    android.os.Process.setCanSelfBackground(false);
+                }
+            });
+        }
+    }
+
+    public static FgThread get() {
+        synchronized (UiThread.class) {
+            ensureThreadLocked();
+            return sInstance;
+        }
+    }
+
+    public static Handler getHandler() {
+        synchronized (UiThread.class) {
+            ensureThreadLocked();
+            return sHandler;
+        }
+    }
+}