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authortromey <tromey@138bc75d-0d04-0410-961f-82ee72b054a4>2006-05-13 02:16:22 +0000
committertromey <tromey@138bc75d-0d04-0410-961f-82ee72b054a4>2006-05-13 02:16:22 +0000
commit3d705eb29f4ecdd97b00551d5d67c3952afaa1f2 (patch)
tree86bc2116f67a8c7a59e8cb0a7732f0fb34197168 /libjava/java/lang/ThreadLocal.java
parent5278adb993255c854b6beba0075adfe362c50210 (diff)
downloadgcc-3d705eb29f4ecdd97b00551d5d67c3952afaa1f2.tar.gz
* sources.am, Makefile.in: Rebuilt.
* java/util/logging/LogManager.java: Removed. * java/util/logging/Logger.java (resetLogger): New method, from Classpath. * java/io/RandomAccessFile.java: Removed. * gnu/java/nio/channels/FileChannelImpl.java (create): New method. (FileChannelImpl): Now private. * java/io/FileInputStream.java: Removed. * java/io/FileOutputStream.java: Removed. * java/security/AccessControlContext.java: Removed. * java/lang/ThreadLocal.java: Removed. * java/lang/InheritableThreadLocal.java: Removed. * java/lang/Thread.java (locals): New field. (getThreadLocals): New method. * java/lang/natThread.cc (finish_): Clear 'locals'. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@113735 138bc75d-0d04-0410-961f-82ee72b054a4
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-/* ThreadLocal -- a variable with a unique value per thread
- Copyright (C) 2000, 2002, 2003 Free Software Foundation, Inc.
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath 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 for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-package java.lang;
-
-import java.util.Collections;
-import java.util.Map;
-import java.util.WeakHashMap;
-
-
-/**
- * ThreadLocal objects have a different state associated with every
- * Thread that accesses them. Every access to the ThreadLocal object
- * (through the <code>get()</code> and <code>set()</code> methods)
- * only affects the state of the object as seen by the currently
- * executing Thread.
- *
- * <p>The first time a ThreadLocal object is accessed on a particular
- * Thread, the state for that Thread's copy of the local variable is set by
- * executing the method <code>initialValue()</code>.
- * </p>
- *
- * <p>An example how you can use this:
- * </p>
- *
- * <pre>
- * class Connection
- * {
- * private static ThreadLocal owner = new ThreadLocal()
- * {
- * public Object initialValue()
- * {
- * return("nobody");
- * }
- * };
- * ...
- * }
- * </pre>
- *
- * <p>Now all instances of connection can see who the owner of the currently
- * executing Thread is by calling <code>owner.get()</code>. By default any
- * Thread would be associated with 'nobody'. But the Connection object could
- * offer a method that changes the owner associated with the Thread on
- * which the method was called by calling <code>owner.put("somebody")</code>.
- * (Such an owner changing method should then be guarded by security checks.)
- * </p>
- *
- * <p>When a Thread is garbage collected all references to values of
- * the ThreadLocal objects associated with that Thread are removed.
- * </p>
- *
- * @author Mark Wielaard (mark@klomp.org)
- * @author Eric Blake (ebb9@email.byu.edu)
- * @since 1.2
- * @status updated to 1.4
- */
-public class ThreadLocal
-{
- /**
- * Placeholder to distinguish between uninitialized and null set by the
- * user. Do not expose this to the public. Package visible for use by
- * InheritableThreadLocal
- */
- static final Object NULL = new Object();
-
- /**
- * The stored value. Package visible for use by InheritableThreadLocal. */
- Object value;
-
- /**
- * Maps Threads to values. Uses a WeakHashMap so if a Thread is garbage
- * collected the reference to the Value will disappear. A null value means
- * uninitialized, while NULL means a user-specified null. Only the
- * <code>set(Thread, Object)</code> and <code>get(Thread)</code> methods
- * access it. Package visible for use by InheritableThreadLocal.
- */
- final Map valueMap = Collections.synchronizedMap(new WeakHashMap());
-
- /**
- * Creates a ThreadLocal object without associating any value to it yet.
- */
- public ThreadLocal()
- {
- }
-
- /**
- * Called once per thread on the first invocation of get(), if set() was
- * not already called. The default implementation returns <code>null</code>.
- * Often, this method is overridden to create the appropriate initial object
- * for the current thread's view of the ThreadLocal.
- *
- * @return the initial value of the variable in this thread
- */
- protected Object initialValue()
- {
- return null;
- }
-
- /**
- * Gets the value associated with the ThreadLocal object for the currently
- * executing Thread. If this is the first time the current thread has called
- * get(), and it has not already called set(), the value is obtained by
- * <code>initialValue()</code>.
- *
- * @return the value of the variable in this thread
- */
- public Object get()
- {
- Thread currentThread = Thread.currentThread();
- // Note that we don't have to synchronize, as only this thread will
- // ever modify the returned value and valueMap is a synchronizedMap.
- Object value = valueMap.get(currentThread);
- if (value == null)
- {
- value = initialValue();
- valueMap.put(currentThread, value == null ? NULL : value);
- }
- return value == NULL ? null : value;
- }
-
- /**
- * Sets the value associated with the ThreadLocal object for the currently
- * executing Thread. This overrides any existing value associated with the
- * current Thread and prevents <code>initialValue()</code> from being
- * called if this is the first access to this ThreadLocal in this Thread.
- *
- * @param value the value to set this thread's view of the variable to
- */
- public void set(Object value)
- {
- // Note that we don't have to synchronize, as only this thread will
- // ever modify the returned value and valueMap is a synchronizedMap.
- valueMap.put(Thread.currentThread(), value == null ? NULL : value);
- }
-}