| /* | |
| * 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 | |
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| * questions. | |
| */ | |
| /* | |
| * This file is available under and governed by the GNU General Public | |
| * License version 2 only, as published by the Free Software Foundation. | |
| * However, the following notice accompanied the original version of this | |
| * file: | |
| * | |
| * Written by Doug Lea with assistance from members of JCP JSR-166 | |
| * Expert Group and released to the public domain, as explained at | |
| * http://creativecommons.org/publicdomain/zero/1.0/ | |
| */ | |
| /** | |
| * Interfaces and classes providing a framework for locking and waiting | |
| * for conditions that is distinct from built-in synchronization and | |
| * monitors. The framework permits much greater flexibility in the use of | |
| * locks and conditions, at the expense of more awkward syntax. | |
| * | |
| * <p>The {@link java.util.concurrent.locks.Lock} interface supports | |
| * locking disciplines that differ in semantics (reentrant, fair, etc), | |
| * and that can be used in non-block-structured contexts including | |
| * hand-over-hand and lock reordering algorithms. The main implementation | |
| * is {@link java.util.concurrent.locks.ReentrantLock}. | |
| * | |
| * <p>The {@link java.util.concurrent.locks.ReadWriteLock} interface | |
| * similarly defines locks that may be shared among readers but are | |
| * exclusive to writers. Only a single implementation, {@link | |
| * java.util.concurrent.locks.ReentrantReadWriteLock}, is provided, since | |
| * it covers most standard usage contexts. But programmers may create | |
| * their own implementations to cover nonstandard requirements. | |
| * | |
| * <p>The {@link java.util.concurrent.locks.Condition} interface | |
| * describes condition variables that may be associated with Locks. | |
| * These are similar in usage to the implicit monitors accessed using | |
| * {@code Object.wait}, but offer extended capabilities. | |
| * In particular, multiple {@code Condition} objects may be associated | |
| * with a single {@code Lock}. To avoid compatibility issues, the | |
| * names of {@code Condition} methods are different from the | |
| * corresponding {@code Object} versions. | |
| * | |
| * <p>The {@link java.util.concurrent.locks.AbstractQueuedSynchronizer} | |
| * class serves as a useful superclass for defining locks and other | |
| * synchronizers that rely on queuing blocked threads. The {@link | |
| * java.util.concurrent.locks.AbstractQueuedLongSynchronizer} class | |
| * provides the same functionality but extends support to 64 bits of | |
| * synchronization state. Both extend class {@link | |
| * java.util.concurrent.locks.AbstractOwnableSynchronizer}, a simple | |
| * class that helps record the thread currently holding exclusive | |
| * synchronization. The {@link java.util.concurrent.locks.LockSupport} | |
| * class provides lower-level blocking and unblocking support that is | |
| * useful for those developers implementing their own customized lock | |
| * classes. | |
| * | |
| * @since 1.5 | |
| */ | |
| package java.util.concurrent.locks; |