JDK 1.1 Source Code Directory
JDK 1.1 source code directory contains Java source code for JDK 1.1 core classes:
"C:\fyicenter\jdk-1.1.8\src".
Here is the list of Java classes of the JDK 1.1 source code:
✍: FYIcenter
⏎ java/lang/Thread.java
/*
* @(#)Thread.java 1.74 01/12/10
*
* Copyright 2002 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.lang;
/**
* A <i>thread</i> is a thread of execution in a program. The Java
* Virtual Machine allows an application to have multiple threads of
* execution running concurrently.
* <p>
* Every thread has a priority. Threads with higher priority are
* executed in preference to threads with lower priority. Each thread
* may or may not also be marked as a daemon. When code running in
* some thread creates a new <code>Thread</code> object, the new
* thread has its priority initially set equal to the priority of the
* creating thread, and is a daemon thread if and only if the
* creating thread is a daemon.
* <p>
* When a Java Virtual Machine starts up, there is usually a single
* non-daemon thread (which typically calls the method named
* <code>main</code> of some designated class). The Java Virtual
* Machine continues to execute threads until either of the following
* occurs:
* <ul>
* <li>The <code>exit</code> method of class <code>Runtime</code> has been
* called and the security manager has permitted the exit operation
* to take place.
* <li>All threads that are not daemon threads have died, either by
* returning from the call to the <code>run</code> method or by
* performing the <code>stop</code> method.
* </ul>
* <p>
* There are two ways to create a new thread of execution. One is to
* declare a class to be a subclass of <code>Thread</code>. This
* subclass should override the <code>run</code> method of class
* <code>Thread</code>. An instance of the subclass can then be
* allocated and started. For example, a thread that computes primes
* larger than a stated value could be written as follows:
* <p><hr><blockquote><pre>
* class PrimeThread extends Thread {
* long minPrime;
* PrimeThread(long minPrime) {
* this.minPrime = minPrime;
* }
*
* public void run() {
* // compute primes larger than minPrime
* . . .
* }
* }
* </pre></blockquote><hr>
* <p>
* The following code would then create a thread and start it running:
* <p><blockquote><pre>
* PrimeThread p = new PrimeThread(143);
* p.start();
* </pre></blockquote>
* <p>
* The other way to create a thread is to declare a class that
* implements the <code>Runnable</code> interface. That class then
* implements the <code>run</code> method. An instance of the class can
* then be allocated, passed as an argument when creating
* <code>Thread</code>, and started. The same example in this other
* style looks like the following:
* <p><hr><blockquote><pre>
* class PrimeRun implements Runnable {
* long minPrime;
* PrimeRun(long minPrime) {
* this.minPrime = minPrime;
* }
*
* public void run() {
* // compute primes larger than minPrime
* . . .
* }
* }
* </pre></blockquote><hr>
* <p>
* The following code would then create a thread and start it running:
* <p><blockquote><pre>
* PrimeRun p = new PrimeRun(143);
* new Thread(p).start();
* </pre></blockquote>
* <p>
* Every thread has a name for identification purposes. More than
* one thread may have the same name. If a name is not specified when
* a thread is created, a new name is generated for it.
*
* @author unascribed
* @version 1.74, 12/10/01
* @see java.lang.Runnable
* @see java.lang.Runtime#exit(int)
* @see java.lang.Thread#run()
* @see java.lang.Thread#stop()
* @since JDK1.0
*/
public
class Thread implements Runnable {
private char name[];
private int priority;
private Thread threadQ;
private int PrivateInfo;
private int eetop;
/* Whether or not to single_step this thread. */
private boolean single_step;
/* Whether or not the thread is a daemon thread. */
private boolean daemon = false;
/* Whether or not this thread was asked to exit before it runs.*/
private boolean stillborn = false;
/* What will be run. */
private Runnable target;
/* The system queue of threads is linked through activeThreadQueue. */
private static Thread activeThreadQ;
/* The group of this thread */
private ThreadGroup group;
/* For autonumbering anonymous threads. */
private static int threadInitNumber;
private static synchronized int nextThreadNum() {
return threadInitNumber++;
}
/* The initial segment of the Java stack (not necessarily initialized) */
private int initial_stack_memory;
/**
* The minimum priority that a thread can have.
*
* @since JDK1.0
*/
public final static int MIN_PRIORITY = 1;
/**
* The default priority that is assigned to a thread.
*
* @since JDK1.0
*/
public final static int NORM_PRIORITY = 5;
/**
* The maximum priority that a thread can have.
*
* @since JDK1.0
*/
public final static int MAX_PRIORITY = 10;
/**
* Returns a reference to the currently executing thread object.
*
* @return the currently executing thread.
* @since JDK1.0
*/
public static native Thread currentThread();
/**
* Causes the currently executing thread object to temporarily pause
* and allow other threads to execute.
*
* @since JDK1.0
*/
public static native void yield();
/**
* Causes the currently executing thread to sleep (temporarily cease
* execution) for the specified number of milliseconds. The thread
* does not lose ownership of any monitors.
*
* @param millis the length of time to sleep in milliseconds.
* @exception InterruptedException if another thread has interrupted
* this thread.
* @see java.lang.Object#notify()
* @since JDK1.0
*/
public static native void sleep(long millis) throws InterruptedException;
/**
* Causes the currently executing thread to sleep (cease execution)
* for the specified number of milliseconds plus the specified number
* of nanoseconds. The thread does not lose ownership of any monitors.
*
* @param millis the length of time to sleep in milliseconds.
* @param nanos 0-999999 additional nanoseconds to sleep.
* @exception IllegalArgumentException if the value of millis is negative
* or the value of nanos is not in the range 0-999999.
* @exception InterruptedException if another thread has interrupted
* this thread.
* @see java.lang.Object#notify()
* @since JDK1.0
*/
public static void sleep(long millis, int nanos)
throws InterruptedException {
if (millis < 0) {
throw new IllegalArgumentException("timeout value is negative");
}
if (nanos < 0 || nanos > 999999) {
throw new IllegalArgumentException(
"nanosecond timeout value out of range");
}
if (nanos >= 500000 || (nanos != 0 && millis == 0)) {
millis++;
}
sleep(millis);
}
/**
* Initialize a Thread.
*
* @param g the Thread group
* @param target the object whose run() method gets called
* @param name the name of the new Thread
*/
private void init(ThreadGroup g, Runnable target, String name){
Thread parent = currentThread();
if (g == null) {
/* Determine if it's an applet or not */
SecurityManager security = System.getSecurityManager();
/* If there is a security manager, ask the security manager
what to do. */
if (security != null) {
g = security.getThreadGroup();
}
/* If the security doesn't have a strong opinion of the matter
use the parent thread group. */
if (g == null) {
g = parent.getThreadGroup();
}
}
/* checkAccess regardless of whether or not threadgroup is
explicitly passed in. */
g.checkAccess();
this.group = g;
this.daemon = parent.isDaemon();
this.priority = parent.getPriority();
this.name = name.toCharArray();
this.target = target;
setPriority(priority);
g.add(this);
}
/**
* 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)
* @since JDK1.0
*/
public Thread() {
init(null, null, "Thread-" + nextThreadNum());
}
/**
* 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)
* @since JDK1.0
*/
public Thread(Runnable target) {
init(null, target, "Thread-" + nextThreadNum());
}
/**
* 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 thread group.
* @param target the object whose <code>run</code> method is called.
* @exception SecurityException if the current thread cannot create a
* thread in the specified thread group.
* @see java.lang.Thread#Thread(java.lang.ThreadGroup, java.lang.Runnable, java.lang.String)
* @since JDK1.0
*/
public Thread(ThreadGroup group, Runnable target) {
init(group, target, "Thread-" + nextThreadNum());
}
/**
* 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)
* @since JDK1.0
*/
public Thread(String name) {
init(null, null, name);
}
/**
* Allocates a new <code>Thread</code> object. This constructor has
* the same effect as <code>Thread(group, null, name)</code>
*
* @param group the thread group.
* @param name the name of the new thread.
* @exception SecurityException if the current thread cannot create a
* thread in the specified thread group.
* @see java.lang.Thread#Thread(java.lang.ThreadGroup, java.lang.Runnable, java.lang.String)
* @since JDK1.0
*/
public Thread(ThreadGroup group, String name) {
init(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 object whose <code>run</code> method is called.
* @param name the name of the new thread.
* @see java.lang.Thread#Thread(java.lang.ThreadGroup, java.lang.Runnable, java.lang.String)
* @since JDK1.0
*/
public Thread(Runnable target, String name) {
init(null, target, name);
}
/**
* Allocates a new <code>Thread</code> object so that it has
* <code>target</code> as its run object, has the specified
* <code>name</code> as its name, and belongs to the thread group
* referred to by <code>group</code>.
* <p>
* If <code>group</code> is not <code>null</code>, the
* <code>checkAccess</code> method of that thread group is called with
* no arguments; this may result in throwing a
* <code>SecurityException</code>; if <code>group</code> is
* <code>null</code>, the new process belongs to the same group as
* the thread that is creating the new thread.
* <p>
* If the <code>target</code> argument is not <code>null</code>, the
* <code>run</code> method of the <code>target</code> is called when
* this thread is started. If the target argument is
* <code>null</code>, this thread's <code>run</code> method is called
* when this thread is started.
* <p>
* The priority of the newly created thread is set equal to the
* priority of the thread creating it, that is, the currently running
* thread. The method <code>setPriority</code> may be used to
* change the priority to a new value.
* <p>
* The newly created thread is initially marked as being a daemon
* thread if and only if the thread creating it is currently marked
* as a daemon thread. The method <code>setDaemon </code> may be used
* to change whether or not a thread is a daemon.
*
* @param group the thread group.
* @param target the object whose <code>run</code> method is called.
* @param name the name of the new thread.
* @exception SecurityException if the current thread cannot create a
* thread in the specified thread group.
* @see java.lang.Runnable#run()
* @see java.lang.Thread#run()
* @see java.lang.Thread#setDaemon(boolean)
* @see java.lang.Thread#setPriority(int)
* @see java.lang.ThreadGroup#checkAccess()
* @since JDK1.0
*/
public Thread(ThreadGroup group, Runnable target, String name) {
init(group, target, name);
}
/**
* Causes this thread to begin execution; the Java Virtual Machine
* calls the <code>run</code> method of this thread.
* <p>
* The result is that two threads are running concurrently: the
* current thread (which returns from the call to the
* <code>start</code> method) and the other thread (which executes its
* <code>run</code> method).
*
* @exception IllegalThreadStateException if the thread was already
* started.
* @see java.lang.Thread#run()
* @see java.lang.Thread#stop()
* @since JDK1.0
*/
public synchronized native void start();
/**
* If this thread was constructed using a separate
* <code>Runnable</code> run object, then that
* <code>Runnable</code> object's <code>run</code> method is called;
* otherwise, this method does nothing and returns.
* <p>
* Subclasses of <code>Thread</code> should override this method.
*
* @see java.lang.Thread#start()
* @see java.lang.Thread#stop()
* @see java.lang.Thread#Thread(java.lang.ThreadGroup, java.lang.Runnable, java.lang.String)
* @see java.lang.Runnable#run()
* @since JDK1.0
*/
public void run() {
if (target != null) {
target.run();
}
}
/**
* This method is called by the system to give a Thread
* a chance to clean up before it actually exits.
*/
private void exit() {
if (group != null) {
group.remove(this);
group = null;
}
/* Aggressively null object connected to Thread: see bug 4006245 */
target = null;
}
/**
* Forces the thread to stop executing.
* <p>
* First, the <code>checkAccess</code> method of this thread is called
* with no arguments. This may result in throwing a
* <code>SecurityException</code> (in the current thread).
* <p>
* The thread represented by this thread is forced to stop whatever
* it is doing abnormally and to throw a newly created
* <code>ThreadDeath</code> object as an exception.
* <p>
* It is permitted to stop a thread that has not yet been started.
* If the thread is eventually started, it immediately terminates.
* <p>
* An application should not normally try to catch
* <code>ThreadDeath</code> unless it must do some extraordinary
* cleanup operation (note that the throwing of
* <code>ThreadDeath</code> causes <code>finally</code> clauses of
* <code>try</code> statements to be executed before the thread
* officially dies). If a <code>catch</code> clause catches a
* <code>ThreadDeath</code> object, it is important to rethrow the
* object so that the thread actually dies.
* <p>
* The top-level error handler that reacts to otherwise uncaught
* exceptions does not print out a message or otherwise notify the
* application if the uncaught exception is an instance of
* <code>ThreadDeath</code>.
* <p>
* Note: the use of this method is unsafe as it can result in the
* corruption of invariants. Stopping a thread with Thread.stop causes
* it to unlock all of the monitors that it has locked (as a natural
* consequence of the unchecked <code>ThreadDeath</code> exception
* propagating up the stack). If any of the objects previously protected
* by these monitors were in an inconsistent state, the damaged objects
* become visible to other threads potentially resulting in arbitrary
* behaviour. Many uses of <code>stop</code> should be replaced by code
* that simply modifies some volatile variable to indicate that the target
* thread should stop running. The target thread should check this
* variable regularly, and return from its run method in an orderly
* fashion if the variable indicates that it is to stop running. If the
* target thread waits for long periods, the interrupt method should be
* used to interrupt the wait.
*
* @exception SecurityException if the current thread cannot modify
* this thread.
* @see java.lang.Thread#checkAccess()
* @see java.lang.Thread#run()
* @see java.lang.Thread#start()
* @see java.lang.ThreadDeath
* @see java.lang.ThreadGroup#uncaughtException(java.lang.Thread, java.lang.Throwable)
* @since JDK1.0
*/
public final void stop() {
synchronized (this) {
checkAccess();
resume(); // Wake up thread if it was suspended; no-op otherwise
stop0(new ThreadDeath());
}
}
/**
* Forces the thread to stop executing.
* <p>
* First, the <code>checkAccess</code> method of this thread is called
* with no arguments. This may result in throwing a
* <code>SecurityException </code>(in the current thread).
* <p>
* If the argument <code>obj</code> is null, a
* <code>NullPointerException</code> is thrown (in the current thread).
* <p>
* The thread represented by this thread is forced to complete
* whatever it is doing abnormally and to throw the
* <code>Throwable</code> object <code>obj</code> as an exception. This
* is an unusual action to take; normally, the <code>stop</code> method
* that takes no arguments should be used.
* <p>
* It is permitted to stop a thread that has not yet been started.
* If the thread is eventually started, it immediately terminates.
*
* @param obj the Throwable object to be thrown.
* @exception SecurityException if the current thread cannot modify
* this thread.
* @see java.lang.Thread#checkAccess()
* @see java.lang.Thread#run()
* @see java.lang.Thread#start()
* @see java.lang.Thread#stop()
* @since JDK1.0
*/
public final synchronized void stop(Throwable o) {
checkAccess();
resume(); // Wake up thread if it was suspended; no-op otherwise
stop0(o);
}
/**
* Interrupts this thread.
*
* @since JDK1.0
*/
// Note that this method is not synchronized. Three reasons for this:
// 1) It changes the API.
// 2) It's another place where the system could hang.
// 3) All we're doing is turning on a one-way bit. It doesn't matter
// exactly when it's done WRT probes via the interrupted() method.
public void interrupt() {
checkAccess();
interrupt0();
}
/**
* Tests if the current thread has been interrupted.
* Note that <code>interrupted</code> is a static method, while
* <code>isInterrupted</code> is called on the current
* <code>Thread</code> instance.
*
* @return <code>true</code> if the current thread has been interrupted;
* <code>false</code> otherwise.
* @see java.lang.Thread#isInterrupted()
* @since JDK1.0
*/
public static boolean interrupted() {
return currentThread().isInterrupted(true);
}
/**
* Tests if the current thread has been interrupted.
* Note that <code>isInterrupted</code>
* is called on the current <code>Thread</code> instance; by
* contrast, <code>interrupted</code> is a static method.
*
* @return <code>true</code> if this thread has been interrupted;
* <code>false</code> otherwise.
* @see java.lang.Thread#interrupted()
* @since JDK1.0
*/
public boolean isInterrupted() {
return isInterrupted(false);
}
/**
* Ask if some Thread has been interrupted. The interrupted state
* is reset or not based on the value of ClearInterrupted that is
* passed.
*/
private native boolean isInterrupted(boolean ClearInterrupted);
/**
* Destroys this thread, without any cleanup. Any monitors it has
* locked remain locked. (This method is not implemented in
* Java 1.0.2.)
*
* @since JDK1.0
*/
public void destroy() {
throw new NoSuchMethodError();
}
/**
* Tests if this thread is alive. A thread is alive if it has
* been started and has not yet died.
*
* @return <code>true</code> if this thread is alive;
* <code>false</code> otherwise.
* @since JDK1.0
*/
public final native boolean isAlive();
/**
* Suspends this thread.
* <p>
* First, the <code>checkAccess</code> method of this thread is called
* with no arguments. This may result in throwing a
* <code>SecurityException </code>(in the current thread).
* <p>
* If the thread is alive, it is suspended and makes no further
* progress unless and until it is resumed.
*
* @exception SecurityException if the current thread cannot modify
* this thread.
* @see java.lang.Thread#checkAccess()
* @see java.lang.Thread#isAlive()
* @since JDK1.0
*/
public final void suspend() {
checkAccess();
suspend0();
}
/**
* Resumes a suspended thread.
* <p>
* First, the <code>checkAccess</code> method of this thread is called
* with no arguments. This may result in throwing a
* <code>SecurityException</code>(in the current thread).
* <p>
* If the thread is alive but suspended, it is resumed and is
* permitted to make progress in its execution.
*
* @exception SecurityException if the current thread cannot modify this
* thread.
* @see java.lang.Thread#checkAccess()
* @see java.lang.Thread#isAlive()
* @since JDK1.0
*/
public final void resume() {
checkAccess();
resume0();
}
/**
* Changes the priority of this thread.
* <p>
* First the <code>checkAccess</code> method of this thread is called
* with no arguments. This may result in throwing a
* <code>SecurityException</code>.
* <p>
* Otherwise, the priority of this thread is set to the smaller of
* the specified <code>newPriority</code> and the maximum permitted
* priority of the thread's thread group.
*
* @exception IllegalArgumentException If the priority is not in the
* range <code>MIN_PRIORITY</code> to
* <code>MAX_PRIORITY</code>.
* @exception SecurityException if the current thread cannot modify
* this thread.
* @see java.lang.Thread#checkAccess()
* @see java.lang.Thread#getPriority()
* @see java.lang.Thread#getThreadGroup()
* @see java.lang.Thread#MAX_PRIORITY
* @see java.lang.Thread#MIN_PRIORITY
* @see java.lang.ThreadGroup#getMaxPriority()
* @since JDK1.0
*/
public final void setPriority(int newPriority) {
checkAccess();
if (newPriority > MAX_PRIORITY || newPriority < MIN_PRIORITY) {
throw new IllegalArgumentException();
}
if (newPriority > group.getMaxPriority()) {
newPriority = group.getMaxPriority();
}
setPriority0(priority = newPriority);
}
/**
* Returns this thread's priority.
*
* @return this thread's name.
* @see java.lang.Thread#setPriority(int)
* @since JDK1.0
*/
public final int getPriority() {
return priority;
}
/**
* Changes the name of this thread to be equal to the argument
* <code>name</code>.
* <p>
* First the <code>checkAccess</code> method of this thread is called
* with no arguments. This may result in throwing a
* <code>SecurityException</code>.
*
* @param name the new name for this thread.
* @exception SecurityException if the current thread cannot modify this
* thread.
* @see java.lang.Thread#checkAccess()
* @see java.lang.Thread#getName()
* @since JDK1.0
*/
public final void setName(String name) {
checkAccess();
this.name = name.toCharArray();
}
/**
* Returns this thread's name.
*
* @return this thread's name.
* @see java.lang.Thread#setName(java.lang.String)
* @since JDK1.0
*/
public final String getName() {
return String.valueOf(name);
}
/**
* Returns this thread's thread group.
*
* @return this thread's thread group.
* @since JDK1.0
*/
public final ThreadGroup getThreadGroup() {
return group;
}
/**
* Returns the current number of active threads in this thread group.
*
* @return the current number of threads in this thread's thread group.
* @since JDK1.0
*/
public static int activeCount() {
return currentThread().getThreadGroup().activeCount();
}
/**
* Copies into the specified array every active thread in this
* thread group and its subgroups. This method simply calls the
* <code>enumerate</code> method of this thread's thread group with
* the array argument.
*
* @return the number of threads put into the array.
* @see java.lang.ThreadGroup#enumerate(java.lang.Thread[])
* @since JDK1.0
*/
public static int enumerate(Thread tarray[]) {
return currentThread().getThreadGroup().enumerate(tarray);
}
/**
* Counts the number of stack frames in this thread. The thread must
* be suspended.
*
* @return the number of stack frames in this thread.
* @exception IllegalThreadStateException if this thread is not suspended.
* @since JDK1.0
*/
public native int countStackFrames();
/**
* Waits at most <code>millis</code> milliseconds for this thread to
* die. A timeout of <code>0</code> means to wait forever.
*
* @param millis the time to wait in milliseconds.
* @exception InterruptedException if another thread has interrupted the
* current thread.
* @since JDK1.0
*/
public final synchronized void join(long millis) throws InterruptedException {
long base = System.currentTimeMillis();
long now = 0;
if (millis < 0) {
throw new IllegalArgumentException("timeout value is negative");
}
if (millis == 0) {
while (isAlive()) {
wait(0);
}
} else {
while (isAlive()) {
long delay = millis - now;
if (delay <= 0) {
break;
}
wait(delay);
now = System.currentTimeMillis() - base;
}
}
}
/**
* Waits at most <code>millis</code> milliseconds plus
* <code>nanos</code> nanoseconds for this thread to die.
*
* @param millis the time to wait in milliseconds.
* @param nanos 0-999999 additional nanoseconds to wait.
* @exception IllegalArgumentException if the value of millis is negative
* the value of nanos is not in the range 0-999999.
* @exception InterruptedException if another thread has interrupted the
* current thread.
* @since JDK1.0
*/
public final synchronized void join(long millis, int nanos) throws InterruptedException {
if (millis < 0) {
throw new IllegalArgumentException("timeout value is negative");
}
if (nanos < 0 || nanos > 999999) {
throw new IllegalArgumentException(
"nanosecond timeout value out of range");
}
if (nanos >= 500000 || (nanos != 0 && millis == 0)) {
millis++;
}
join(millis);
}
/**
* Waits for this thread to die.
*
* @exception InterruptedException if another thread has interrupted the
* current thread.
* @since JDK1.0
*/
public final void join() throws InterruptedException {
join(0);
}
/**
* Prints a stack trace of the current thread. This method is used
* only for debugging.
*
* @see java.lang.Throwable#printStackTrace()
* @since JDK1.0
*/
public static void dumpStack() {
new Exception("Stack trace").printStackTrace();
}
/**
* Marks this thread as either a daemon thread or a user thread. The
* Java Virtual Machine exits when the only threads running are all
* daemon threads.
* <p>
* This method must be called before the thread is started.
*
* @param on if <code>true</code>, marks this thread as a
* daemon thread.
* @exception IllegalThreadStateException if this thread is active.
* @see java.lang.Thread#isDaemon()
* @since JDK1.0
*/
public final void setDaemon(boolean on) {
checkAccess();
if (isAlive()) {
throw new IllegalThreadStateException();
}
daemon = on;
}
/**
* Tests if this thread is a daemon thread.
*
* @return <code>true</code> if this thread is a daemon thread;
* <code>false</code> otherwise.
* @see java.lang.Thread#setDaemon(boolean)
* @since JDK1.0
*/
public final boolean isDaemon() {
return daemon;
}
/**
* Determines if the currently running thread has permission to
* modify this thread.
* <p>
* If there is a security manager, its <code>checkAccess</code> method
* is called with this thread as its argument. This may result in
* throwing a <code>SecurityException</code>.
*
* @exception SecurityException if the current thread is not allowed to
* access this thread.
* @see java.lang.SecurityManager#checkAccess(java.lang.Thread)
* @since JDK1.0
*/
public void checkAccess() {
SecurityManager security = System.getSecurityManager();
if (security != null) {
security.checkAccess(this);
}
}
/**
* Returns a string representation of this thread, including the
* thread's name, priority, and thread group.
*
* @return a string representation of this thread.
* @since JDK1.0
*/
public String toString() {
if (getThreadGroup() != null) {
return "Thread[" + getName() + "," + getPriority() + "," +
getThreadGroup().getName() + "]";
} else {
return "Thread[" + getName() + "," + getPriority() + "," +
"" + "]";
}
}
/* Some private helper methods */
private native void setPriority0(int newPriority);
private native void stop0(Object o);
private native void suspend0();
private native void resume0();
private native void interrupt0();
}
⏎ java/lang/Thread.java
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