| /* |
| * 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. |
| */ |
| |
| /* |
| * 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; |