105 lines
4.1 KiB
Java
105 lines
4.1 KiB
Java
/* VMObject.java -- Reference implementation for VM hooks used by Object
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Copyright (C) 1998, 2002, 2005 Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.lang;
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/**
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* Object is the ultimate superclass of every class (excepting interfaces).
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* As such, it needs help from the VM.
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*
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* @author John Keiser
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* @author Eric Blake (ebb9@email.byu.edu)
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*/
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final class VMObject
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{
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/**
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* Returns the runtime {@link Class} of a given Object.
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*
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* @param obj the object to return the class for.
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*
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* @return the class of the Object.
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*/
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static native Class getClass(Object obj);
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/**
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* The VM is expected to make a field-for-field shallow copy of the
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* argument. Thus, the copy has the same runtime type as the argument.
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* Note, however, that the cloned object must still be finalizable, even
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* if the original has already had finalize() invoked on it.
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*
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* @param c the Cloneable to clone
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* @return the clone
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*/
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static native Object clone(Cloneable c);
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/**
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* Wakes up one of the threads that is waiting on this Object's monitor.
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* Only the owner of a lock on the Object may call this method. The Thread
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* to wake up is chosen arbitrarily.
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*
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* @param o the object doing the notify
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* @throw IllegalMonitorStateException if this Thread does not own the
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* lock on the Object
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*/
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static native void notify(Object o) throws IllegalMonitorStateException;
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/**
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* Wakes up all of the threads waiting on this Object's monitor. Only
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* the owner of the lock on this Object may call this method.
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*
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* @param o the object doing the notifyAll
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* @throws IllegalMonitorStateException if this Thread does not own the
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* lock on the Object
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*/
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static native void notifyAll(Object o) throws IllegalMonitorStateException;
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/**
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* Waits a specified amount of time for notify() or notifyAll() to be
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* called on this Object. The VM does not have to pay attention to the
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* ns argument, if it does not have that much granularity.
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*
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* @param o the object to suspend on
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* @param ms milliseconds to wait (1,000 milliseconds = 1 second)
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* @param ns nanoseconds to wait beyond ms (1,000,000 nanoseconds
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* == 1 millisecond)
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* @throws IllegalMonitorStateException if this Thread does not own the
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* lock on the Object
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* @throws InterruptedException if some other Thread interrupts this Thread
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*/
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static native void wait(Object o, long ms, int ns)
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throws IllegalMonitorStateException, InterruptedException;
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}
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