mirror of git://gcc.gnu.org/git/gcc.git
914 lines
31 KiB
Java
914 lines
31 KiB
Java
/* Thread -- an independent thread of executable code
|
|
Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004
|
|
Free Software Foundation
|
|
|
|
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., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 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 gnu.gcj.RawData;
|
|
import gnu.gcj.RawDataManaged;
|
|
|
|
/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
|
|
* "The Java Language Specification", ISBN 0-201-63451-1
|
|
* plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
|
|
* Status: Believed complete to version 1.4, with caveats. We do not
|
|
* implement the deprecated (and dangerous) stop, suspend, and resume
|
|
* methods. Security implementation is not complete.
|
|
*/
|
|
|
|
/**
|
|
* Thread represents a single thread of execution in the VM. When an
|
|
* application VM starts up, it creates a non-daemon Thread which calls the
|
|
* main() method of a particular class. There may be other Threads running,
|
|
* such as the garbage collection thread.
|
|
*
|
|
* <p>Threads have names to identify them. These names are not necessarily
|
|
* unique. Every Thread has a priority, as well, which tells the VM which
|
|
* Threads should get more running time. New threads inherit the priority
|
|
* and daemon status of the parent thread, by default.
|
|
*
|
|
* <p>There are two methods of creating a Thread: you may subclass Thread and
|
|
* implement the <code>run()</code> method, at which point you may start the
|
|
* Thread by calling its <code>start()</code> method, or you may implement
|
|
* <code>Runnable</code> in the class you want to use and then call new
|
|
* <code>Thread(your_obj).start()</code>.
|
|
*
|
|
* <p>The virtual machine runs until all non-daemon threads have died (either
|
|
* by returning from the run() method as invoked by start(), or by throwing
|
|
* an uncaught exception); or until <code>System.exit</code> is called with
|
|
* adequate permissions.
|
|
*
|
|
* <p>It is unclear at what point a Thread should be added to a ThreadGroup,
|
|
* and at what point it should be removed. Should it be inserted when it
|
|
* starts, or when it is created? Should it be removed when it is suspended
|
|
* or interrupted? The only thing that is clear is that the Thread should be
|
|
* removed when it is stopped.
|
|
*
|
|
* @author Tom Tromey
|
|
* @author John Keiser
|
|
* @author Eric Blake <ebb9@email.byu.edu>
|
|
* @see Runnable
|
|
* @see Runtime#exit(int)
|
|
* @see #run()
|
|
* @see #start()
|
|
* @see ThreadLocal
|
|
* @since 1.0
|
|
* @status updated to 1.4
|
|
*/
|
|
public class Thread implements Runnable
|
|
{
|
|
/** The minimum priority for a Thread. */
|
|
public static final int MIN_PRIORITY = 1;
|
|
|
|
/** The priority a Thread gets by default. */
|
|
public static final int NORM_PRIORITY = 5;
|
|
|
|
/** The maximum priority for a Thread. */
|
|
public static final int MAX_PRIORITY = 10;
|
|
|
|
/**
|
|
* The group this thread belongs to. This is set to null by
|
|
* ThreadGroup.removeThread when the thread dies.
|
|
*/
|
|
ThreadGroup group;
|
|
|
|
/** The object to run(), null if this is the target. */
|
|
private Runnable runnable;
|
|
|
|
/** The thread name, non-null. */
|
|
String name;
|
|
|
|
/** Whether the thread is a daemon. */
|
|
private boolean daemon;
|
|
|
|
/** The thread priority, 1 to 10. */
|
|
private int priority;
|
|
|
|
boolean interrupt_flag;
|
|
private boolean alive_flag;
|
|
private boolean startable_flag;
|
|
|
|
/** The context classloader for this Thread. */
|
|
private ClassLoader contextClassLoader;
|
|
|
|
// This describes the top-most interpreter frame for this thread.
|
|
RawData interp_frame;
|
|
|
|
// Our native data - points to an instance of struct natThread.
|
|
private RawDataManaged data;
|
|
|
|
/**
|
|
* Allocates a new <code>Thread</code> object. This constructor has
|
|
* the same effect as <code>Thread(null, null,</code>
|
|
* <i>gname</i><code>)</code>, where <b><i>gname</i></b> is
|
|
* a newly generated name. Automatically generated names are of the
|
|
* form <code>"Thread-"+</code><i>n</i>, where <i>n</i> is an integer.
|
|
* <p>
|
|
* Threads created this way must have overridden their
|
|
* <code>run()</code> method to actually do anything. An example
|
|
* illustrating this method being used follows:
|
|
* <p><blockquote><pre>
|
|
* import java.lang.*;
|
|
*
|
|
* class plain01 implements Runnable {
|
|
* String name;
|
|
* plain01() {
|
|
* name = null;
|
|
* }
|
|
* plain01(String s) {
|
|
* name = s;
|
|
* }
|
|
* public void run() {
|
|
* if (name == null)
|
|
* System.out.println("A new thread created");
|
|
* else
|
|
* System.out.println("A new thread with name " + name +
|
|
* " created");
|
|
* }
|
|
* }
|
|
* class threadtest01 {
|
|
* public static void main(String args[] ) {
|
|
* int failed = 0 ;
|
|
*
|
|
* <b>Thread t1 = new Thread();</b>
|
|
* if (t1 != null)
|
|
* System.out.println("new Thread() succeed");
|
|
* else {
|
|
* System.out.println("new Thread() failed");
|
|
* failed++;
|
|
* }
|
|
* }
|
|
* }
|
|
* </pre></blockquote>
|
|
*
|
|
* @see java.lang.Thread#Thread(java.lang.ThreadGroup,
|
|
* java.lang.Runnable, java.lang.String)
|
|
*/
|
|
public Thread()
|
|
{
|
|
this(null, null, gen_name());
|
|
}
|
|
|
|
/**
|
|
* Allocates a new <code>Thread</code> object. This constructor has
|
|
* the same effect as <code>Thread(null, target,</code>
|
|
* <i>gname</i><code>)</code>, where <i>gname</i> is
|
|
* a newly generated name. Automatically generated names are of the
|
|
* form <code>"Thread-"+</code><i>n</i>, where <i>n</i> is an integer.
|
|
*
|
|
* @param target the object whose <code>run</code> method is called.
|
|
* @see java.lang.Thread#Thread(java.lang.ThreadGroup,
|
|
* java.lang.Runnable, java.lang.String)
|
|
*/
|
|
public Thread(Runnable target)
|
|
{
|
|
this(null, target, gen_name());
|
|
}
|
|
|
|
/**
|
|
* Allocates a new <code>Thread</code> object. This constructor has
|
|
* the same effect as <code>Thread(null, null, name)</code>.
|
|
*
|
|
* @param name the name of the new thread.
|
|
* @see java.lang.Thread#Thread(java.lang.ThreadGroup,
|
|
* java.lang.Runnable, java.lang.String)
|
|
*/
|
|
public Thread(String name)
|
|
{
|
|
this(null, null, name);
|
|
}
|
|
|
|
/**
|
|
* Allocates a new <code>Thread</code> object. This constructor has
|
|
* the same effect as <code>Thread(group, target,</code>
|
|
* <i>gname</i><code>)</code>, where <i>gname</i> is
|
|
* a newly generated name. Automatically generated names are of the
|
|
* form <code>"Thread-"+</code><i>n</i>, where <i>n</i> is an integer.
|
|
*
|
|
* @param group the group to put the Thread into
|
|
* @param target the Runnable object to execute
|
|
* @throws SecurityException if this thread cannot access <code>group</code>
|
|
* @throws IllegalThreadStateException if group is destroyed
|
|
* @see #Thread(ThreadGroup, Runnable, String)
|
|
*/
|
|
public Thread(ThreadGroup group, Runnable target)
|
|
{
|
|
this(group, target, gen_name());
|
|
}
|
|
|
|
/**
|
|
* Allocates a new <code>Thread</code> object. This constructor has
|
|
* the same effect as <code>Thread(group, null, name)</code>
|
|
*
|
|
* @param group the group to put the Thread into
|
|
* @param name the name for the Thread
|
|
* @throws NullPointerException if name is null
|
|
* @throws SecurityException if this thread cannot access <code>group</code>
|
|
* @throws IllegalThreadStateException if group is destroyed
|
|
* @see #Thread(ThreadGroup, Runnable, String)
|
|
*/
|
|
public Thread(ThreadGroup group, String name)
|
|
{
|
|
this(group, null, name);
|
|
}
|
|
|
|
/**
|
|
* Allocates a new <code>Thread</code> object. This constructor has
|
|
* the same effect as <code>Thread(null, target, name)</code>.
|
|
*
|
|
* @param target the Runnable object to execute
|
|
* @param name the name for the Thread
|
|
* @throws NullPointerException if name is null
|
|
* @see #Thread(ThreadGroup, Runnable, String)
|
|
*/
|
|
public Thread(Runnable target, String name)
|
|
{
|
|
this(null, target, name);
|
|
}
|
|
|
|
/**
|
|
* Allocate a new Thread object, with the specified ThreadGroup and name, and
|
|
* using the specified Runnable object's <code>run()</code> method to
|
|
* execute. If the Runnable object is null, <code>this</code> (which is
|
|
* a Runnable) is used instead.
|
|
*
|
|
* <p>If the ThreadGroup is null, the security manager is checked. If a
|
|
* manager exists and returns a non-null object for
|
|
* <code>getThreadGroup</code>, that group is used; otherwise the group
|
|
* of the creating thread is used. Note that the security manager calls
|
|
* <code>checkAccess</code> if the ThreadGroup is not null.
|
|
*
|
|
* <p>The new Thread will inherit its creator's priority and daemon status.
|
|
* These can be changed with <code>setPriority</code> and
|
|
* <code>setDaemon</code>.
|
|
*
|
|
* @param group the group to put the Thread into
|
|
* @param target the Runnable object to execute
|
|
* @param name the name for the Thread
|
|
* @throws NullPointerException if name is null
|
|
* @throws SecurityException if this thread cannot access <code>group</code>
|
|
* @throws IllegalThreadStateException if group is destroyed
|
|
* @see Runnable#run()
|
|
* @see #run()
|
|
* @see #setDaemon(boolean)
|
|
* @see #setPriority(int)
|
|
* @see SecurityManager#checkAccess(ThreadGroup)
|
|
* @see ThreadGroup#checkAccess()
|
|
*/
|
|
public Thread(ThreadGroup group, Runnable target, String name)
|
|
{
|
|
this(currentThread(), group, target, name);
|
|
}
|
|
|
|
/**
|
|
* Allocate a new Thread object, as if by
|
|
* <code>Thread(group, null, name)</code>, and give it the specified stack
|
|
* size, in bytes. The stack size is <b>highly platform independent</b>,
|
|
* and the virtual machine is free to round up or down, or ignore it
|
|
* completely. A higher value might let you go longer before a
|
|
* <code>StackOverflowError</code>, while a lower value might let you go
|
|
* longer before an <code>OutOfMemoryError</code>. Or, it may do absolutely
|
|
* nothing! So be careful, and expect to need to tune this value if your
|
|
* virtual machine even supports it.
|
|
*
|
|
* @param group the group to put the Thread into
|
|
* @param target the Runnable object to execute
|
|
* @param name the name for the Thread
|
|
* @param size the stack size, in bytes; 0 to be ignored
|
|
* @throws NullPointerException if name is null
|
|
* @throws SecurityException if this thread cannot access <code>group</code>
|
|
* @throws IllegalThreadStateException if group is destroyed
|
|
* @since 1.4
|
|
*/
|
|
public Thread(ThreadGroup group, Runnable target, String name, long size)
|
|
{
|
|
// Just ignore stackSize for now.
|
|
this(currentThread(), group, target, name);
|
|
}
|
|
|
|
private Thread (Thread current, ThreadGroup g, Runnable r, String n)
|
|
{
|
|
// The Class Libraries book says ``threadName cannot be null''. I
|
|
// take this to mean NullPointerException.
|
|
if (n == null)
|
|
throw new NullPointerException ();
|
|
|
|
if (g == null)
|
|
{
|
|
// If CURRENT is null, then we are bootstrapping the first thread.
|
|
// Use ThreadGroup.root, the main threadgroup.
|
|
if (current == null)
|
|
group = ThreadGroup.root;
|
|
else
|
|
group = current.getThreadGroup();
|
|
}
|
|
else
|
|
group = g;
|
|
|
|
data = null;
|
|
interrupt_flag = false;
|
|
alive_flag = false;
|
|
startable_flag = true;
|
|
|
|
if (current != null)
|
|
{
|
|
group.checkAccess();
|
|
|
|
daemon = current.isDaemon();
|
|
int gmax = group.getMaxPriority();
|
|
int pri = current.getPriority();
|
|
priority = (gmax < pri ? gmax : pri);
|
|
contextClassLoader = current.contextClassLoader;
|
|
InheritableThreadLocal.newChildThread(this);
|
|
}
|
|
else
|
|
{
|
|
daemon = false;
|
|
priority = NORM_PRIORITY;
|
|
}
|
|
|
|
name = n;
|
|
group.addThread(this);
|
|
runnable = r;
|
|
|
|
initialize_native ();
|
|
}
|
|
|
|
/**
|
|
* Get the number of active threads in the current Thread's ThreadGroup.
|
|
* This implementation calls
|
|
* <code>currentThread().getThreadGroup().activeCount()</code>.
|
|
*
|
|
* @return the number of active threads in the current ThreadGroup
|
|
* @see ThreadGroup#activeCount()
|
|
*/
|
|
public static int activeCount()
|
|
{
|
|
return currentThread().group.activeCount();
|
|
}
|
|
|
|
/**
|
|
* Check whether the current Thread is allowed to modify this Thread. This
|
|
* passes the check on to <code>SecurityManager.checkAccess(this)</code>.
|
|
*
|
|
* @throws SecurityException if the current Thread cannot modify this Thread
|
|
* @see SecurityManager#checkAccess(Thread)
|
|
*/
|
|
public final void checkAccess()
|
|
{
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null)
|
|
sm.checkAccess(this);
|
|
}
|
|
|
|
/**
|
|
* Count the number of stack frames in this Thread. The Thread in question
|
|
* must be suspended when this occurs.
|
|
*
|
|
* @return the number of stack frames in this Thread
|
|
* @throws IllegalThreadStateException if this Thread is not suspended
|
|
* @deprecated pointless, since suspend is deprecated
|
|
*/
|
|
public native int countStackFrames();
|
|
|
|
/**
|
|
* Get the currently executing Thread.
|
|
*
|
|
* @return the currently executing Thread
|
|
*/
|
|
public static native Thread currentThread();
|
|
|
|
/**
|
|
* Originally intended to destroy this thread, this method was never
|
|
* implemented by Sun, and is hence a no-op.
|
|
*/
|
|
public void destroy()
|
|
{
|
|
throw new NoSuchMethodError();
|
|
}
|
|
|
|
/**
|
|
* Print a stack trace of the current thread to stderr using the same
|
|
* format as Throwable's printStackTrace() method.
|
|
*
|
|
* @see Throwable#printStackTrace()
|
|
*/
|
|
public static void dumpStack()
|
|
{
|
|
(new Exception("Stack trace")).printStackTrace();
|
|
}
|
|
|
|
/**
|
|
* Copy every active thread in the current Thread's ThreadGroup into the
|
|
* array. Extra threads are silently ignored. This implementation calls
|
|
* <code>getThreadGroup().enumerate(array)</code>, which may have a
|
|
* security check, <code>checkAccess(group)</code>.
|
|
*
|
|
* @param array the array to place the Threads into
|
|
* @return the number of Threads placed into the array
|
|
* @throws NullPointerException if array is null
|
|
* @throws SecurityException if you cannot access the ThreadGroup
|
|
* @see ThreadGroup#enumerate(Thread[])
|
|
* @see #activeCount()
|
|
* @see SecurityManager#checkAccess(ThreadGroup)
|
|
*/
|
|
public static int enumerate(Thread[] array)
|
|
{
|
|
return currentThread().group.enumerate(array);
|
|
}
|
|
|
|
/**
|
|
* Get this Thread's name.
|
|
*
|
|
* @return this Thread's name
|
|
*/
|
|
public final String getName()
|
|
{
|
|
return name;
|
|
}
|
|
|
|
/**
|
|
* Get this Thread's priority.
|
|
*
|
|
* @return the Thread's priority
|
|
*/
|
|
public final int getPriority()
|
|
{
|
|
return priority;
|
|
}
|
|
|
|
/**
|
|
* Get the ThreadGroup this Thread belongs to. If the thread has died, this
|
|
* returns null.
|
|
*
|
|
* @return this Thread's ThreadGroup
|
|
*/
|
|
public final ThreadGroup getThreadGroup()
|
|
{
|
|
return group;
|
|
}
|
|
|
|
/**
|
|
* Checks whether the current thread holds the monitor on a given object.
|
|
* This allows you to do <code>assert Thread.holdsLock(obj)</code>.
|
|
*
|
|
* @param obj the object to test lock ownership on.
|
|
* @return true if the current thread is currently synchronized on obj
|
|
* @throws NullPointerException if obj is null
|
|
* @since 1.4
|
|
*/
|
|
public static native boolean holdsLock(Object obj);
|
|
|
|
/**
|
|
* Interrupt this Thread. First, there is a security check,
|
|
* <code>checkAccess</code>. Then, depending on the current state of the
|
|
* thread, various actions take place:
|
|
*
|
|
* <p>If the thread is waiting because of {@link #wait()},
|
|
* {@link #sleep(long)}, or {@link #join()}, its <i>interrupt status</i>
|
|
* will be cleared, and an InterruptedException will be thrown. Notice that
|
|
* this case is only possible if an external thread called interrupt().
|
|
*
|
|
* <p>If the thread is blocked in an interruptible I/O operation, in
|
|
* {@link java.nio.channels.InterruptibleChannel}, the <i>interrupt
|
|
* status</i> will be set, and ClosedByInterruptException will be thrown.
|
|
*
|
|
* <p>If the thread is blocked on a {@link java.nio.channels.Selector}, the
|
|
* <i>interrupt status</i> will be set, and the selection will return, with
|
|
* a possible non-zero value, as though by the wakeup() method.
|
|
*
|
|
* <p>Otherwise, the interrupt status will be set.
|
|
*
|
|
* @throws SecurityException if you cannot modify this Thread
|
|
*/
|
|
public native void interrupt();
|
|
|
|
/**
|
|
* Determine whether the current Thread has been interrupted, and clear
|
|
* the <i>interrupted status</i> in the process.
|
|
*
|
|
* @return whether the current Thread has been interrupted
|
|
* @see #isInterrupted()
|
|
*/
|
|
public static boolean interrupted()
|
|
{
|
|
return currentThread().isInterrupted(true);
|
|
}
|
|
|
|
/**
|
|
* Determine whether the given Thread has been interrupted, but leave
|
|
* the <i>interrupted status</i> alone in the process.
|
|
*
|
|
* @return whether the Thread has been interrupted
|
|
* @see #interrupted()
|
|
*/
|
|
public boolean isInterrupted()
|
|
{
|
|
return interrupt_flag;
|
|
}
|
|
|
|
/**
|
|
* Determine whether this Thread is alive. A thread which is alive has
|
|
* started and not yet died.
|
|
*
|
|
* @return whether this Thread is alive
|
|
*/
|
|
public final boolean isAlive()
|
|
{
|
|
return alive_flag;
|
|
}
|
|
|
|
/**
|
|
* Tell whether this is a daemon Thread or not.
|
|
*
|
|
* @return whether this is a daemon Thread or not
|
|
* @see #setDaemon(boolean)
|
|
*/
|
|
public final boolean isDaemon()
|
|
{
|
|
return daemon;
|
|
}
|
|
|
|
/**
|
|
* Wait forever for the Thread in question to die.
|
|
*
|
|
* @throws InterruptedException if the Thread is interrupted; it's
|
|
* <i>interrupted status</i> will be cleared
|
|
*/
|
|
public final void join() throws InterruptedException
|
|
{
|
|
join(0, 0);
|
|
}
|
|
|
|
/**
|
|
* Wait the specified amount of time for the Thread in question to die.
|
|
*
|
|
* @param ms the number of milliseconds to wait, or 0 for forever
|
|
* @throws InterruptedException if the Thread is interrupted; it's
|
|
* <i>interrupted status</i> will be cleared
|
|
*/
|
|
public final void join(long ms) throws InterruptedException
|
|
{
|
|
join(ms, 0);
|
|
}
|
|
|
|
/**
|
|
* Wait the specified amount of time for the Thread in question to die.
|
|
*
|
|
* <p>Note that 1,000,000 nanoseconds == 1 millisecond, but most VMs do
|
|
* not offer that fine a grain of timing resolution. Besides, there is
|
|
* no guarantee that this thread can start up immediately when time expires,
|
|
* because some other thread may be active. So don't expect real-time
|
|
* performance.
|
|
*
|
|
* @param ms the number of milliseconds to wait, or 0 for forever
|
|
* @param ns the number of extra nanoseconds to sleep (0-999999)
|
|
* @throws InterruptedException if the Thread is interrupted; it's
|
|
* <i>interrupted status</i> will be cleared
|
|
* @throws IllegalArgumentException if ns is invalid
|
|
* @XXX A ThreadListener would be nice, to make this efficient.
|
|
*/
|
|
public final native void join(long ms, int ns)
|
|
throws InterruptedException;
|
|
|
|
/**
|
|
* Resume a suspended thread.
|
|
*
|
|
* @throws SecurityException if you cannot resume the Thread
|
|
* @see #checkAccess()
|
|
* @see #suspend()
|
|
* @deprecated pointless, since suspend is deprecated
|
|
*/
|
|
public final native void resume();
|
|
|
|
private final native void finish_();
|
|
|
|
/**
|
|
* Determine whether the given Thread has been interrupted, but leave
|
|
* the <i>interrupted status</i> alone in the process.
|
|
*
|
|
* @return whether the current Thread has been interrupted
|
|
* @see #interrupted()
|
|
*/
|
|
private boolean isInterrupted(boolean clear_flag)
|
|
{
|
|
boolean r = interrupt_flag;
|
|
if (clear_flag && r)
|
|
{
|
|
// Only clear the flag if we saw it as set. Otherwise this could
|
|
// potentially cause us to miss an interrupt in a race condition,
|
|
// because this method is not synchronized.
|
|
interrupt_flag = false;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
/**
|
|
* The method of Thread that will be run if there is no Runnable object
|
|
* associated with the Thread. Thread's implementation does nothing at all.
|
|
*
|
|
* @see #start()
|
|
* @see #Thread(ThreadGroup, Runnable, String)
|
|
*/
|
|
public void run()
|
|
{
|
|
if (runnable != null)
|
|
runnable.run();
|
|
}
|
|
|
|
/**
|
|
* Set the daemon status of this Thread. If this is a daemon Thread, then
|
|
* the VM may exit even if it is still running. This may only be called
|
|
* before the Thread starts running. There may be a security check,
|
|
* <code>checkAccess</code>.
|
|
*
|
|
* @param daemon whether this should be a daemon thread or not
|
|
* @throws SecurityException if you cannot modify this Thread
|
|
* @throws IllegalThreadStateException if the Thread is active
|
|
* @see #isDaemon()
|
|
* @see #checkAccess()
|
|
*/
|
|
public final void setDaemon(boolean daemon)
|
|
{
|
|
if (!startable_flag)
|
|
throw new IllegalThreadStateException();
|
|
checkAccess();
|
|
this.daemon = daemon;
|
|
}
|
|
|
|
/**
|
|
* Returns the context classloader of this Thread. The context
|
|
* classloader can be used by code that want to load classes depending
|
|
* on the current thread. Normally classes are loaded depending on
|
|
* the classloader of the current class. There may be a security check
|
|
* for <code>RuntimePermission("getClassLoader")</code> if the caller's
|
|
* class loader is not null or an ancestor of this thread's context class
|
|
* loader.
|
|
*
|
|
* @return the context class loader
|
|
* @throws SecurityException when permission is denied
|
|
* @see setContextClassLoader(ClassLoader)
|
|
* @since 1.2
|
|
*/
|
|
public synchronized ClassLoader getContextClassLoader()
|
|
{
|
|
if (contextClassLoader == null)
|
|
contextClassLoader = ClassLoader.getSystemClassLoader();
|
|
|
|
SecurityManager sm = System.getSecurityManager();
|
|
// FIXME: we can't currently find the caller's class loader.
|
|
ClassLoader callers = null;
|
|
if (sm != null && callers != null)
|
|
{
|
|
// See if the caller's class loader is the same as or an
|
|
// ancestor of this thread's class loader.
|
|
while (callers != null && callers != contextClassLoader)
|
|
{
|
|
// FIXME: should use some internal version of getParent
|
|
// that avoids security checks.
|
|
callers = callers.getParent();
|
|
}
|
|
|
|
if (callers != contextClassLoader)
|
|
sm.checkPermission(new RuntimePermission("getClassLoader"));
|
|
}
|
|
|
|
return contextClassLoader;
|
|
}
|
|
|
|
/**
|
|
* Sets the context classloader for this Thread. When not explicitly set,
|
|
* the context classloader for a thread is the same as the context
|
|
* classloader of the thread that created this thread. The first thread has
|
|
* as context classloader the system classloader. There may be a security
|
|
* check for <code>RuntimePermission("setContextClassLoader")</code>.
|
|
*
|
|
* @param classloader the new context class loader
|
|
* @throws SecurityException when permission is denied
|
|
* @see getContextClassLoader()
|
|
* @since 1.2
|
|
*/
|
|
public synchronized void setContextClassLoader(ClassLoader classloader)
|
|
{
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null)
|
|
sm.checkPermission(new RuntimePermission("setContextClassLoader"));
|
|
this.contextClassLoader = classloader;
|
|
}
|
|
|
|
/**
|
|
* Set this Thread's name. There may be a security check,
|
|
* <code>checkAccess</code>.
|
|
*
|
|
* @param name the new name for this Thread
|
|
* @throws NullPointerException if name is null
|
|
* @throws SecurityException if you cannot modify this Thread
|
|
*/
|
|
public final void setName(String name)
|
|
{
|
|
checkAccess();
|
|
// The Class Libraries book says ``threadName cannot be null''. I
|
|
// take this to mean NullPointerException.
|
|
if (name == null)
|
|
throw new NullPointerException();
|
|
this.name = name;
|
|
}
|
|
|
|
/**
|
|
* Causes the currently executing thread object to temporarily pause
|
|
* and allow other threads to execute.
|
|
*/
|
|
public static native void yield();
|
|
|
|
/**
|
|
* Suspend the current Thread's execution for the specified amount of
|
|
* time. The Thread will not lose any locks it has during this time. There
|
|
* are no guarantees which thread will be next to run, but most VMs will
|
|
* choose the highest priority thread that has been waiting longest.
|
|
*
|
|
* @param ms the number of milliseconds to sleep, or 0 for forever
|
|
* @throws InterruptedException if the Thread is interrupted; it's
|
|
* <i>interrupted status</i> will be cleared
|
|
* @see #notify()
|
|
* @see #wait(long)
|
|
*/
|
|
public static void sleep(long ms) throws InterruptedException
|
|
{
|
|
sleep(ms, 0);
|
|
}
|
|
|
|
/**
|
|
* Suspend the current Thread's execution for the specified amount of
|
|
* time. The Thread will not lose any locks it has during this time. There
|
|
* are no guarantees which thread will be next to run, but most VMs will
|
|
* choose the highest priority thread that has been waiting longest.
|
|
*
|
|
* <p>Note that 1,000,000 nanoseconds == 1 millisecond, but most VMs do
|
|
* not offer that fine a grain of timing resolution. Besides, there is
|
|
* no guarantee that this thread can start up immediately when time expires,
|
|
* because some other thread may be active. So don't expect real-time
|
|
* performance.
|
|
*
|
|
* @param ms the number of milliseconds to sleep, or 0 for forever
|
|
* @param ns the number of extra nanoseconds to sleep (0-999999)
|
|
* @throws InterruptedException if the Thread is interrupted; it's
|
|
* <i>interrupted status</i> will be cleared
|
|
* @throws IllegalArgumentException if ns is invalid
|
|
* @see #notify()
|
|
* @see #wait(long, int)
|
|
*/
|
|
public static native void sleep(long timeout, int nanos)
|
|
throws InterruptedException;
|
|
|
|
/**
|
|
* Start this Thread, calling the run() method of the Runnable this Thread
|
|
* was created with, or else the run() method of the Thread itself. This
|
|
* is the only way to start a new thread; calling run by yourself will just
|
|
* stay in the same thread. The virtual machine will remove the thread from
|
|
* its thread group when the run() method completes.
|
|
*
|
|
* @throws IllegalThreadStateException if the thread has already started
|
|
* @see #run()
|
|
*/
|
|
public native void start();
|
|
|
|
/**
|
|
* Cause this Thread to stop abnormally because of the throw of a ThreadDeath
|
|
* error. If you stop a Thread that has not yet started, it will stop
|
|
* immediately when it is actually started.
|
|
*
|
|
* <p>This is inherently unsafe, as it can interrupt synchronized blocks and
|
|
* leave data in bad states. Hence, there is a security check:
|
|
* <code>checkAccess(this)</code>, plus another one if the current thread
|
|
* is not this: <code>RuntimePermission("stopThread")</code>. If you must
|
|
* catch a ThreadDeath, be sure to rethrow it after you have cleaned up.
|
|
* ThreadDeath is the only exception which does not print a stack trace when
|
|
* the thread dies.
|
|
*
|
|
* @throws SecurityException if you cannot stop the Thread
|
|
* @see #interrupt()
|
|
* @see #checkAccess()
|
|
* @see #start()
|
|
* @see ThreadDeath
|
|
* @see ThreadGroup#uncaughtException(Thread, Throwable)
|
|
* @see SecurityManager#checkAccess(Thread)
|
|
* @see SecurityManager#checkPermission(Permission)
|
|
* @deprecated unsafe operation, try not to use
|
|
*/
|
|
public final void stop()
|
|
{
|
|
// Argument doesn't matter, because this is no longer
|
|
// supported.
|
|
stop(null);
|
|
}
|
|
|
|
/**
|
|
* Cause this Thread to stop abnormally and throw the specified exception.
|
|
* If you stop a Thread that has not yet started, it will stop immediately
|
|
* when it is actually started. <b>WARNING</b>This bypasses Java security,
|
|
* and can throw a checked exception which the call stack is unprepared to
|
|
* handle. Do not abuse this power.
|
|
*
|
|
* <p>This is inherently unsafe, as it can interrupt synchronized blocks and
|
|
* leave data in bad states. Hence, there is a security check:
|
|
* <code>checkAccess(this)</code>, plus another one if the current thread
|
|
* is not this: <code>RuntimePermission("stopThread")</code>. If you must
|
|
* catch a ThreadDeath, be sure to rethrow it after you have cleaned up.
|
|
* ThreadDeath is the only exception which does not print a stack trace when
|
|
* the thread dies.
|
|
*
|
|
* @param t the Throwable to throw when the Thread dies
|
|
* @throws SecurityException if you cannot stop the Thread
|
|
* @throws NullPointerException in the calling thread, if t is null
|
|
* @see #interrupt()
|
|
* @see #checkAccess()
|
|
* @see #start()
|
|
* @see ThreadDeath
|
|
* @see ThreadGroup#uncaughtException(Thread, Throwable)
|
|
* @see SecurityManager#checkAccess(Thread)
|
|
* @see SecurityManager#checkPermission(Permission)
|
|
* @deprecated unsafe operation, try not to use
|
|
*/
|
|
public final native void stop(Throwable e);
|
|
|
|
/**
|
|
* Suspend this Thread. It will not come back, ever, unless it is resumed.
|
|
*
|
|
* <p>This is inherently unsafe, as the suspended thread still holds locks,
|
|
* and can potentially deadlock your program. Hence, there is a security
|
|
* check: <code>checkAccess</code>.
|
|
*
|
|
* @throws SecurityException if you cannot suspend the Thread
|
|
* @see #checkAccess()
|
|
* @see #resume()
|
|
* @deprecated unsafe operation, try not to use
|
|
*/
|
|
public final native void suspend();
|
|
|
|
/**
|
|
* Set this Thread's priority. There may be a security check,
|
|
* <code>checkAccess</code>, then the priority is set to the smaller of
|
|
* priority and the ThreadGroup maximum priority.
|
|
*
|
|
* @param priority the new priority for this Thread
|
|
* @throws IllegalArgumentException if priority exceeds MIN_PRIORITY or
|
|
* MAX_PRIORITY
|
|
* @throws SecurityException if you cannot modify this Thread
|
|
* @see #getPriority()
|
|
* @see #checkAccess()
|
|
* @see ThreadGroup#getMaxPriority()
|
|
* @see #MIN_PRIORITY
|
|
* @see #MAX_PRIORITY
|
|
*/
|
|
public final native void setPriority(int newPriority);
|
|
|
|
/**
|
|
* Returns a string representation of this thread, including the
|
|
* thread's name, priority, and thread group.
|
|
*
|
|
* @return a human-readable String representing this Thread
|
|
*/
|
|
public String toString()
|
|
{
|
|
return ("Thread[" + name + "," + priority + ","
|
|
+ (group == null ? "" : group.getName()) + "]");
|
|
}
|
|
|
|
private final native void initialize_native();
|
|
|
|
private final native static String gen_name();
|
|
}
|