Document why we use VarHandle directly rather than Atomics (87306201) · Commits · e / os / android_frameworks_base

core/java/android/os/CombinedMessageQueue/MessageQueue.java

+6 −0

Original line number	Diff line number	Diff line
		@@ -2608,6 +2608,8 @@ public final class MessageQueue {
		private volatile boolean mRemovedFromStackValue;
		static {
		try {
		// We need to use VarHandle rather than java.util.concurrent.atomic.*
		// for performance reasons. See: b/421437036
		MethodHandles.Lookup l = MethodHandles.lookup();
		sRemovedFromStack = l.findVarHandle(MessageQueue.MessageNode.class,
		"mRemovedFromStackValue", boolean.class);
		@@ -2681,6 +2683,8 @@ public final class MessageQueue {

		static {
		try {
		// We need to use VarHandle rather than java.util.concurrent.atomic.*
		// for performance reasons. See: b/421437036
		MethodHandles.Lookup l = MethodHandles.lookup();
		sState = l.findVarHandle(MessageQueue.class, "mStateValue",
		MessageQueue.StackNode.class);
		@@ -2803,6 +2807,8 @@ public final class MessageQueue {
		private volatile long mCountsValue = 0;
		static {
		try {
		// We need to use VarHandle rather than java.util.concurrent.atomic.*
		// for performance reasons. See: b/421437036
		MethodHandles.Lookup l = MethodHandles.lookup();
		sCounts = l.findVarHandle(MessageQueue.MessageCounts.class, "mCountsValue",
		long.class);