Add ability to guard a thread against setting its own prio to bg
The guard is compiled out by default because it adds overhead to
android.os.Process.setPriority().
Change-Id: Ibb2a648c6349b381abb7ae62a358888b04fba871
diff --git a/services/java/com/android/server/SystemServer.java b/services/java/com/android/server/SystemServer.java
index 7130636..c01680e 100644
--- a/services/java/com/android/server/SystemServer.java
+++ b/services/java/com/android/server/SystemServer.java
@@ -80,7 +80,8 @@
android.os.Process.THREAD_PRIORITY_FOREGROUND);
BinderInternal.disableBackgroundScheduling(true);
-
+ android.os.Process.setCanSelfBackground(false);
+
String factoryTestStr = SystemProperties.get("ro.factorytest");
int factoryTest = "".equals(factoryTestStr) ? SystemServer.FACTORY_TEST_OFF
: Integer.parseInt(factoryTestStr);
diff --git a/services/java/com/android/server/WindowManagerService.java b/services/java/com/android/server/WindowManagerService.java
index bf86b23..483f9eb 100644
--- a/services/java/com/android/server/WindowManagerService.java
+++ b/services/java/com/android/server/WindowManagerService.java
@@ -572,6 +572,7 @@
mHaveInputMethods);
android.os.Process.setThreadPriority(
android.os.Process.THREAD_PRIORITY_DISPLAY);
+ android.os.Process.setCanSelfBackground(false);
synchronized (this) {
mService = s;
@@ -607,6 +608,7 @@
// Log.VERBOSE, "WindowManagerPolicy", Log.LOG_ID_SYSTEM));
android.os.Process.setThreadPriority(
android.os.Process.THREAD_PRIORITY_FOREGROUND);
+ android.os.Process.setCanSelfBackground(false);
mPolicy.init(mContext, mService, mPM);
synchronized (this) {
diff --git a/services/java/com/android/server/am/ActivityManagerService.java b/services/java/com/android/server/am/ActivityManagerService.java
index 46861ee..93122c4 100644
--- a/services/java/com/android/server/am/ActivityManagerService.java
+++ b/services/java/com/android/server/am/ActivityManagerService.java
@@ -1259,6 +1259,7 @@
android.os.Process.setThreadPriority(
android.os.Process.THREAD_PRIORITY_FOREGROUND);
+ android.os.Process.setCanSelfBackground(false);
ActivityManagerService m = new ActivityManagerService();