Implement the ThreadPrioritySetter interface
Implement the ThreadPrioritySetter interface and register it in
runtime.
Bug: 139521784
Test: CtsLibcoreTestCases, device boot to home, thread priority set
as expected.
Change-Id: Ib486b7229d5eb723fbb550ed73435fa24afe5190
diff --git a/core/java/com/android/internal/os/RuntimeInit.java b/core/java/com/android/internal/os/RuntimeInit.java
index fa823c4..c230754 100644
--- a/core/java/com/android/internal/os/RuntimeInit.java
+++ b/core/java/com/android/internal/os/RuntimeInit.java
@@ -35,6 +35,7 @@
import com.android.server.NetworkManagementSocketTagger;
import dalvik.system.RuntimeHooks;
+import dalvik.system.ThreadPrioritySetter;
import dalvik.system.VMRuntime;
import libcore.content.type.MimeMap;
@@ -204,6 +205,7 @@
*/
public static void preForkInit() {
if (DEBUG) Slog.d(TAG, "Entered preForkInit.");
+ RuntimeHooks.setThreadPrioritySetter(new RuntimeThreadPrioritySetter());
RuntimeInit.enableDdms();
// TODO(b/142019040#comment13): Decide whether to load the default instance eagerly, i.e.
// MimeMap.setDefault(DefaultMimeMapFactory.create());
@@ -216,6 +218,35 @@
MimeMap.setDefaultSupplier(DefaultMimeMapFactory::create);
}
+ private static class RuntimeThreadPrioritySetter implements ThreadPrioritySetter {
+ // Should remain consistent with kNiceValues[] in system/libartpalette/palette_android.cc
+ private static final int[] NICE_VALUES = {
+ Process.THREAD_PRIORITY_LOWEST, // 1 (MIN_PRIORITY)
+ Process.THREAD_PRIORITY_BACKGROUND + 6,
+ Process.THREAD_PRIORITY_BACKGROUND + 3,
+ Process.THREAD_PRIORITY_BACKGROUND,
+ Process.THREAD_PRIORITY_DEFAULT, // 5 (NORM_PRIORITY)
+ Process.THREAD_PRIORITY_DEFAULT - 2,
+ Process.THREAD_PRIORITY_DEFAULT - 4,
+ Process.THREAD_PRIORITY_URGENT_DISPLAY + 3,
+ Process.THREAD_PRIORITY_URGENT_DISPLAY + 2,
+ Process.THREAD_PRIORITY_URGENT_DISPLAY // 10 (MAX_PRIORITY)
+ };
+
+ @Override
+ public void setPriority(int nativeTid, int priority) {
+ // Check NICE_VALUES[] length first.
+ if (NICE_VALUES.length != (1 + Thread.MAX_PRIORITY - Thread.MIN_PRIORITY)) {
+ throw new AssertionError("Unexpected NICE_VALUES.length=" + NICE_VALUES.length);
+ }
+ // Priority should be in the range of MIN_PRIORITY (1) to MAX_PRIORITY (10).
+ if (priority < Thread.MIN_PRIORITY || priority > Thread.MAX_PRIORITY) {
+ throw new IllegalArgumentException("Priority out of range: " + priority);
+ }
+ Process.setThreadPriority(nativeTid, NICE_VALUES[priority - Thread.MIN_PRIORITY]);
+ }
+ }
+
@UnsupportedAppUsage
protected static final void commonInit() {
if (DEBUG) Slog.d(TAG, "Entered RuntimeInit!");