--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/java.base/share/classes/sun/misc/ConditionLock.java Sun Aug 17 15:54:13 2014 +0100
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 1994, 2005, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package sun.misc;
+
+/**
+ * ConditionLock is a Lock with a built in state variable. This class
+ * provides the ability to wait for the state variable to be set to a
+ * desired value and then acquire the lock.<p>
+ *
+ * The lockWhen() and unlockWith() methods can be safely intermixed
+ * with the lock() and unlock() methods. However if there is a thread
+ * waiting for the state variable to become a particular value and you
+ * simply call Unlock(), that thread will not be able to acquire the
+ * lock until the state variable equals its desired value. <p>
+ *
+ * @author Peter King
+ */
+public final
+class ConditionLock extends Lock {
+ private int state = 0;
+
+ /**
+ * Creates a ConditionLock.
+ */
+ public ConditionLock () {
+ }
+
+ /**
+ * Creates a ConditionLock in an initialState.
+ */
+ public ConditionLock (int initialState) {
+ state = initialState;
+ }
+
+ /**
+ * Acquires the lock when the state variable equals the desired state.
+ *
+ * @param desiredState the desired state
+ * @exception java.lang.InterruptedException if any thread has
+ * interrupted this thread.
+ */
+ public synchronized void lockWhen(int desiredState)
+ throws InterruptedException
+ {
+ while (state != desiredState) {
+ wait();
+ }
+ lock();
+ }
+
+ /**
+ * Releases the lock, and sets the state to a new value.
+ * @param newState the new state
+ */
+ public synchronized void unlockWith(int newState) {
+ state = newState;
+ unlock();
+ }
+}