80 lines
3.8 KiB
Java
80 lines
3.8 KiB
Java
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* This file is available under and governed by the GNU General Public
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* License version 2 only, as published by the Free Software Foundation.
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* However, the following notice accompanied the original version of this
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* file:
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*
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* Written by Doug Lea with assistance from members of JCP JSR-166
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* Expert Group and released to the public domain, as explained at
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* http://creativecommons.org/publicdomain/zero/1.0/
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*/
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/**
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* Interfaces and classes providing a framework for locking and waiting
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* for conditions that is distinct from built-in synchronization and
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* monitors. The framework permits much greater flexibility in the use of
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* locks and conditions, at the expense of more awkward syntax.
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*
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* <p>The {@link java.util.concurrent.locks.Lock} interface supports
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* locking disciplines that differ in semantics (reentrant, fair, etc),
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* and that can be used in non-block-structured contexts including
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* hand-over-hand and lock reordering algorithms. The main implementation
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* is {@link java.util.concurrent.locks.ReentrantLock}.
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*
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* <p>The {@link java.util.concurrent.locks.ReadWriteLock} interface
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* similarly defines locks that may be shared among readers but are
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* exclusive to writers. Only a single implementation, {@link
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* java.util.concurrent.locks.ReentrantReadWriteLock}, is provided, since
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* it covers most standard usage contexts. But programmers may create
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* their own implementations to cover nonstandard requirements.
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*
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* <p>The {@link java.util.concurrent.locks.Condition} interface
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* describes condition variables that may be associated with Locks.
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* These are similar in usage to the implicit monitors accessed using
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* {@code Object.wait}, but offer extended capabilities.
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* In particular, multiple {@code Condition} objects may be associated
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* with a single {@code Lock}. To avoid compatibility issues, the
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* names of {@code Condition} methods are different from the
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* corresponding {@code Object} versions.
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*
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* <p>The {@link java.util.concurrent.locks.AbstractQueuedSynchronizer}
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* class serves as a useful superclass for defining locks and other
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* synchronizers that rely on queuing blocked threads. The {@link
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* java.util.concurrent.locks.AbstractQueuedLongSynchronizer} class
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* provides the same functionality but extends support to 64 bits of
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* synchronization state. Both extend class {@link
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* java.util.concurrent.locks.AbstractOwnableSynchronizer}, a simple
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* class that helps record the thread currently holding exclusive
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* synchronization. The {@link java.util.concurrent.locks.LockSupport}
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* class provides lower-level blocking and unblocking support that is
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* useful for those developers implementing their own customized lock
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* classes.
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*
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* @since 1.5
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*/
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package java.util.concurrent.locks;
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