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authorAndrew Haley <aph@redhat.com>2016-09-30 16:24:48 +0000
committerAndrew Haley <aph@gcc.gnu.org>2016-09-30 16:24:48 +0000
commit07b78716af6a9d7c9fd1e94d9baf94a52c873947 (patch)
tree3f22b3241c513ad168c8353805614ae1249410f4 /libjava/java/lang/ThreadLocal.java
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Makefile.def: Remove libjava.
2016-09-30 Andrew Haley <aph@redhat.com> * Makefile.def: Remove libjava. * Makefile.tpl: Likewise. * Makefile.in: Regenerate. * configure.ac: Likewise. * configure: Likewise. * gcc/java: Remove. * libjava: Likewise. From-SVN: r240662
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-/* ThreadLocal -- a variable with a unique value per thread
- Copyright (C) 2000, 2002, 2003, 2006 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.Map;
-
-
-/**
- * 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 1.5
- */
-public class ThreadLocal<T>
-{
- /**
- * 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 sentinel = new Object();
-
- /**
- * The base for the computation of the next hash for a thread local.
- */
- private static int nextHashBase = 1;
-
- /**
- * Allocate a new hash.
- */
- private synchronized int computeNextHash()
- {
- return nextHashBase++ * 6709;
- }
-
- /**
- * Hash code computed for ThreadLocalMap
- */
- final int fastHash;
-
- /**
- * Creates a ThreadLocal object without associating any value to it yet.
- */
- public ThreadLocal()
- {
- constructNative();
- fastHash = computeNextHash();
- }
-
- /**
- * 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 T 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 native T get();
-
- private final Object internalGet()
- {
- ThreadLocalMap map = Thread.getThreadLocals();
- // Note that we don't have to synchronize, as only this thread will
- // ever modify the map.
- T value = (T) map.get(this);
- if (value == sentinel)
- {
- value = initialValue();
- map.set(this, value);
- }
- return 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 native void set(T value);
-
- private final void internalSet(Object value)
- {
- ThreadLocalMap map = Thread.getThreadLocals();
- // Note that we don't have to synchronize, as only this thread will
- // ever modify the map.
- map.set(this, value);
- }
-
- /**
- * Removes the value associated with the ThreadLocal object for the
- * currently executing Thread.
- * @since 1.5
- */
- public native void remove();
-
- private final void internalRemove()
- {
- ThreadLocalMap map = Thread.getThreadLocals();
- map.remove(this);
- }
-
- protected native void finalize () throws Throwable;
-
- private native void constructNative();
-
- private gnu.gcj.RawData TLSPointer;
-}