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| 1 | /* | ||
| 2 | * Copyright (c) 1994, 2005, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.misc; | ||
| 27 | |||
| 28 | /** | ||
| 29 | * ConditionLock is a Lock with a built in state variable. This class | ||
| 30 | * provides the ability to wait for the state variable to be set to a | ||
| 31 | * desired value and then acquire the lock.<p> | ||
| 32 | * | ||
| 33 | * The lockWhen() and unlockWith() methods can be safely intermixed | ||
| 34 | * with the lock() and unlock() methods. However if there is a thread | ||
| 35 | * waiting for the state variable to become a particular value and you | ||
| 36 | * simply call Unlock(), that thread will not be able to acquire the | ||
| 37 | * lock until the state variable equals its desired value. <p> | ||
| 38 | * | ||
| 39 | * @author Peter King | ||
| 40 | */ | ||
| 41 | public final | ||
| 42 | class ConditionLock extends Lock { | ||
| 43 | private int state = 0; | ||
| 44 | |||
| 45 | /** | ||
| 46 | * Creates a ConditionLock. | ||
| 47 | */ | ||
| 48 | public ConditionLock () { | ||
| 49 | } | ||
| 50 | |||
| 51 | /** | ||
| 52 | * Creates a ConditionLock in an initialState. | ||
| 53 | */ | ||
| 54 | public ConditionLock (int initialState) { | ||
| 55 | state = initialState; | ||
| 56 | } | ||
| 57 | |||
| 58 | /** | ||
| 59 | * Acquires the lock when the state variable equals the desired state. | ||
| 60 | * | ||
| 61 | * @param desiredState the desired state | ||
| 62 | * @exception java.lang.InterruptedException if any thread has | ||
| 63 | * interrupted this thread. | ||
| 64 | */ | ||
| 65 | public synchronized void lockWhen(int desiredState) | ||
| 66 | throws InterruptedException | ||
| 67 | { | ||
| 68 | while (state != desiredState) { | ||
| 69 | wait(); | ||
| 70 | } | ||
| 71 | lock(); | ||
| 72 | } | ||
| 73 | |||
| 74 | /** | ||
| 75 | * Releases the lock, and sets the state to a new value. | ||
| 76 | * @param newState the new state | ||
| 77 | */ | ||
| 78 | public synchronized void unlockWith(int newState) { | ||
| 79 | state = newState; | ||
| 80 | unlock(); | ||
| 81 | } | ||
| 82 | } | ||