java.lang
Class Thread

java.lang.Object
  |
  +--java.lang.Thread

All Implemented Interfaces:

Runnable

Direct Known Subclasses:

EventDispatchThread, HTTPConnectionHandler, HTTPSocketCtl, javax.swing.text.LayoutQueue.LayoutThread, ListenThread, javax.swing.JEditorPane.PageLoader, RecvThread, RunnerThread, SecureRandomCrewSeedIt, SendThread, TCPConnectionListener, TimerJitterEntropy, TimerThread, TimerThread, UserThread, WeakPtrThread

public class Thread

extends Object

implements Runnable

Untamed:

Field Summary

private sun.nio.ch.Interruptible	blocker
private ClassLoader	contextClassLoader
private boolean	daemon
private long	eetop
private ThreadGroup	group
(package private) java.lang.ThreadLocal.ThreadLocalMap	inheritableThreadLocals
private AccessControlContext	inheritedAccessControlContext
static int	MAX_PRIORITY Enabled: The maximum priority that a thread can have.
static int	MIN_PRIORITY Enabled: The minimum priority that a thread can have.
private char[]	name
static int	NORM_PRIORITY Enabled: The default priority that is assigned to a thread.
private int	priority
private boolean	single_step
private long	stackSize
private boolean	stillborn
private static RuntimePermission	stopThreadPermission
private Runnable	target
private static int	threadInitNumber
(package private) java.lang.ThreadLocal.ThreadLocalMap	threadLocals
private Thread	threadQ

Constructor Summary

Thread()
Enabled: Allocates a new Thread object.

Thread(Runnable target)
Enabled: Allocates a new Thread object.

Thread(Runnable target, String name)
Enabled: Allocates a new Thread object.

Thread(String name)
Enabled: Allocates a new Thread object.

Thread(ThreadGroup group, Runnable target)
Enabled: Allocates a new Thread object.

Thread(ThreadGroup group, Runnable target, String name)
Enabled: Allocates a new Thread object so that it has target as its run object, has the specified name as its name, and belongs to the thread group referred to by group.

Thread(ThreadGroup group, Runnable target, String name, long stackSize)
Enabled: Allocates a new Thread object so that it has target as its run object, has the specified name as its name, belongs to the thread group referred to by group, and has the specified stack size.

Thread(ThreadGroup group, String name)
Enabled: Allocates a new Thread object.

Method Summary

static int	activeCount() Enabled: Returns the number of active threads in the current thread's thread group.
private void	blockedOn(sun.nio.ch.Interruptible b)
void	checkAccess() Enabled: Determines if the currently running thread has permission to modify this thread.
int	countStackFrames() Deprecated. The definition of this call depends on suspend(), which is deprecated. Further, the results of this call were never well-defined.
static Thread	currentThread() Enabled: Returns a reference to the currently executing thread object.
void	destroy() Enabled: Destroys this thread, without any cleanup.
static void	dumpStack() Enabled: Prints a stack trace of the current thread.
static int	enumerate(Thread[] tarray) Enabled: Copies into the specified array every active thread in the current thread's thread group and its subgroups.
private void	exit() This method is called by the system to give a Thread a chance to clean up before it actually exits.
ClassLoader	getContextClassLoader() Enabled: Returns the context ClassLoader for this Thread.
String	getName() Enabled: Returns this thread's name.
int	getPriority() Enabled: Returns this thread's priority.
ThreadGroup	getThreadGroup() Enabled: Returns the thread group to which this thread belongs.
static boolean	holdsLock(Object obj) Enabled: Returns true if and only if the current thread holds the monitor lock on the specified object.
private void	init(ThreadGroup g, Runnable target, String name, long stackSize) Initialize a Thread.
void	interrupt() Enabled: Interrupts this thread.
private void	interrupt0()
static boolean	interrupted() Enabled: Tests whether the current thread has been interrupted.
boolean	isAlive() Enabled: Tests if this thread is alive.
boolean	isDaemon() Enabled: Tests if this thread is a daemon thread.
boolean	isInterrupted() Enabled: Tests whether this thread has been interrupted.
private boolean	isInterrupted(boolean ClearInterrupted) Tests if some Thread has been interrupted.
void	join() Enabled: Waits for this thread to die.
void	join(long millis) Enabled: Waits at most millis milliseconds for this thread to die.
void	join(long millis, int nanos) Enabled: Waits at most millis milliseconds plus nanos nanoseconds for this thread to die.
private static int	nextThreadNum()
private static void	registerNatives()
void	resume() Deprecated. This method exists solely for use with suspend(), which has been deprecated because it is deadlock-prone. For more information, see Why are Thread.stop, Thread.suspend and Thread.resume Deprecated?.
private void	resume0()
void	run() Enabled: If this thread was constructed using a separate Runnable run object, then that Runnable object's run method is called; otherwise, this method does nothing and returns.
void	setContextClassLoader(ClassLoader cl) Enabled: Sets the context ClassLoader for this Thread.
void	setDaemon(boolean on) Enabled: Marks this thread as either a daemon thread or a user thread.
void	setName(String name) Enabled: Changes the name of this thread to be equal to the argument name.
void	setPriority(int newPriority) Enabled: Changes the priority of this thread.
private void	setPriority0(int newPriority)
static void	sleep(long millis) Enabled: Causes the currently executing thread to sleep (temporarily cease execution) for the specified number of milliseconds.
static void	sleep(long millis, int nanos) Enabled: Causes the currently executing thread to sleep (cease execution) for the specified number of milliseconds plus the specified number of nanoseconds.
void	start() Enabled: Causes this thread to begin execution; the Java Virtual Machine calls the run method of this thread.
void	stop() Deprecated. This method is inherently unsafe. 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 ThreadDeath 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 behavior. Many uses of stop should be replaced by code that simply modifies some 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 (on a condition variable, for example), the interrupt method should be used to interrupt the wait. For more information, see Why are Thread.stop, Thread.suspend and Thread.resume Deprecated?.
void	stop(Throwable obj) Deprecated. This method is inherently unsafe. See stop() (with no arguments) for details. An additional danger of this method is that it may be used to generate exceptions that the target thread is unprepared to handle (including checked exceptions that the thread could not possibly throw, were it not for this method). For more information, see Why are Thread.stop, Thread.suspend and Thread.resume Deprecated?.
private void	stop0(Object o)
void	suspend() Deprecated. This method has been deprecated, as it is inherently deadlock-prone. If the target thread holds a lock on the monitor protecting a critical system resource when it is suspended, no thread can access this resource until the target thread is resumed. If the thread that would resume the target thread attempts to lock this monitor prior to calling resume, deadlock results. Such deadlocks typically manifest themselves as "frozen" processes. For more information, see Why are Thread.stop, Thread.suspend and Thread.resume Deprecated?.
private void	suspend0()
String	toString() Suppressed: Returns a string representation of this thread, including the thread's name, priority, and thread group.
static void	yield() Enabled: Causes the currently executing thread object to temporarily pause and allow other threads to execute.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

name

private char[] name

priority

private int priority

threadQ

private Thread threadQ

eetop

private long eetop

single_step

private boolean single_step

daemon

private boolean daemon

stillborn

private boolean stillborn

target

private Runnable target

group

private ThreadGroup group

contextClassLoader

private ClassLoader contextClassLoader

inheritedAccessControlContext

private AccessControlContext inheritedAccessControlContext

threadInitNumber

private static int threadInitNumber

stopThreadPermission

private static RuntimePermission stopThreadPermission

threadLocals

java.lang.ThreadLocal.ThreadLocalMap threadLocals

inheritableThreadLocals

java.lang.ThreadLocal.ThreadLocalMap inheritableThreadLocals

stackSize

private long stackSize

blocker

private volatile sun.nio.ch.Interruptible blocker

MIN_PRIORITY

public static final int MIN_PRIORITY

Enabled: The minimum priority that a thread can have.

NORM_PRIORITY

public static final int NORM_PRIORITY

Enabled: The default priority that is assigned to a thread.

MAX_PRIORITY

public static final int MAX_PRIORITY

Enabled: The maximum priority that a thread can have.

Constructor Detail

Thread

public Thread()

Enabled: Allocates a new Thread object. This constructor has the same effect as Thread(null, null, gname), where gname is a newly generated name. Automatically generated names are of the form "Thread-"+n, where n is an integer.

See Also:

java.lang.Thread#Thread(java.lang.ThreadGroup, java.lang.Runnable, java.lang.String)

Thread

public Thread(Runnable target)

Enabled: Allocates a new Thread object. This constructor has the same effect as Thread(null, target, gname), where gname is a newly generated name. Automatically generated names are of the form "Thread-"+n, where n is an integer.

Parameters:

target - the object whose run method is called.

See Also:

java.lang.Thread#Thread(java.lang.ThreadGroup, java.lang.Runnable, java.lang.String)

Thread

public Thread(ThreadGroup group,
              Runnable target)

Enabled: Allocates a new Thread object. This constructor has the same effect as Thread(group, target, gname), where gname is a newly generated name. Automatically generated names are of the form "Thread-"+n, where n is an integer.

Parameters:

group - the thread group.

target - the object whose run method is called.

See Also:

java.lang.Thread#Thread(java.lang.ThreadGroup, java.lang.Runnable, java.lang.String)

Thread

public Thread(String name)

Enabled: Allocates a new Thread object. This constructor has the same effect as Thread(null, null, name).

Parameters:

name - the name of the new thread.

See Also:

java.lang.Thread#Thread(java.lang.ThreadGroup, java.lang.Runnable, java.lang.String)

Thread

public Thread(ThreadGroup group,
              String name)

Enabled: Allocates a new Thread object. This constructor has the same effect as Thread(group, null, name)

Parameters:

group - the thread group.

name - the name of the new thread.

See Also:

java.lang.Thread#Thread(java.lang.ThreadGroup, java.lang.Runnable, java.lang.String)

Thread

public Thread(Runnable target,
              String name)

Enabled: Allocates a new Thread object. This constructor has the same effect as Thread(null, target, name).

Parameters:

target - the object whose run method is called.

name - the name of the new thread.

See Also:

java.lang.Thread#Thread(java.lang.ThreadGroup, java.lang.Runnable, java.lang.String)

Thread

public Thread(ThreadGroup group,
              Runnable target,
              String name)

Enabled: Allocates a new Thread object so that it has target as its run object, has the specified name as its name, and belongs to the thread group referred to by group.

If group is null and there is a security manager, the group is determined by the security manager's getThreadGroup method. If group is null and there is not a security manager, or the security manager's getThreadGroup method returns null, the group is set to be the same ThreadGroup as the thread that is creating the new thread.

If there is a security manager, its checkAccess method is called with the ThreadGroup as its argument. This may result in a SecurityException.

If the target argument is not null, the run method of the target is called when this thread is started. If the target argument is null, this thread's run method is called when this thread is started.

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 setPriority may be used to change the priority to a new value.

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 setDaemon may be used to change whether or not a thread is a daemon.

Parameters:

group - the thread group.

target - the object whose run method is called.

name - the name of the new thread.

See Also:

java.lang.Runnable#run(), java.lang.Thread#run(), java.lang.Thread#setDaemon(boolean), java.lang.Thread#setPriority(int), java.lang.ThreadGroup#checkAccess(), SecurityManager.checkAccess(java.lang.Thread)

Thread

public Thread(ThreadGroup group,
              Runnable target,
              String name,
              long stackSize)

Enabled: Allocates a new Thread object so that it has target as its run object, has the specified name as its name, belongs to the thread group referred to by group, and has the specified stack size.

This constructor is identical to Thread(ThreadGroup,Runnable,String) with the exception of the fact that it allows the thread stack size to be specified. The stack size is the approximate number of bytes of address space that the virtual machine is to allocate for this thread's stack. The effect of the stackSize parameter, if any, is highly platform dependent.

On some platforms, specifying a higher value for the stackSize parameter may allow a thread to achieve greater recursion depth before throwing a StackOverflowError. Similarly, specifying a lower value may allow a greater number of threads to exist concurrently without throwing an an OutOfMemoryError (or other internal error). The details of the relationship between the value of the stackSize parameter and the maximum recursion depth and concurrency level are platform-dependent. On some platforms, the value of the stackSize parameter may have no effect whatsoever.

The virtual machine is free to treat the stackSize parameter as a suggestion. If the specified value is unreasonably low for the platform, the virtual machine may instead use some platform-specific minimum value; if the specified value is unreasonably high, the virtual machine may instead use some platform-specific maximum. Likewise, the virtual machine is free to round the specified value up or down as it sees fit (or to ignore it completely).

Specifying a value of zero for the stackSize parameter will cause this constructor to behave exactly like the Thread(ThreadGroup, Runnable, String) constructor.

Due to the platform-dependent nature of the behavior of this constructor, extreme care should be exercised in its use. The thread stack size necessary to perform a given computation will likely vary from one JRE implementation to another. In light of this variation, careful tuning of the stack size parameter may be required, and the tuning may need to be repeated for each JRE implementation on which an application is to run.

Implementation note: Java platform implementers are encouraged to document their implementation's behavior with respect to the stackSize parameter.

Parameters:

group - the thread group.

target - the object whose run method is called.

name - the name of the new thread.

stackSize - the desired stack size for the new thread, or zero to indicate that this parameter is to be ignored.

Method Detail

registerNatives

private static void registerNatives()

nextThreadNum

private static int nextThreadNum()

blockedOn

private void blockedOn(sun.nio.ch.Interruptible b)

currentThread

public static Thread currentThread()

Enabled: Returns a reference to the currently executing thread object.

Returns:

the currently executing thread.

yield

public static void yield()

Enabled: Causes the currently executing thread object to temporarily pause and allow other threads to execute.

sleep

public static void sleep(long millis)
                  throws InterruptedException

Enabled: 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.

Parameters:

millis - the length of time to sleep in milliseconds.

InterruptedException

See Also:

java.lang.Object#notify()

sleep

public static void sleep(long millis,
                         int nanos)
                  throws InterruptedException

Enabled: 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.

Parameters:

millis - the length of time to sleep in milliseconds.

nanos - 0-999999 additional nanoseconds to sleep.

InterruptedException

See Also:

java.lang.Object#notify()

init

private void init(ThreadGroup g,
                  Runnable target,
                  String name,
                  long stackSize)

Initialize a Thread.

Parameters:

g - the Thread group

target - the object whose run() method gets called

name - the name of the new Thread

stackSize - the desired stack size for the new thread, or zero to indicate that this parameter is to be ignored.

start

public void start()

Enabled: Causes this thread to begin execution; the Java Virtual Machine calls the run method of this thread.

The result is that two threads are running concurrently: the current thread (which returns from the call to the start method) and the other thread (which executes its run method).

See Also:

java.lang.Thread#run(), java.lang.Thread#stop()

run

public void run()

Enabled: If this thread was constructed using a separate Runnable run object, then that Runnable object's run method is called; otherwise, this method does nothing and returns.

Subclasses of Thread should override this method.

Specified by:

run in interface Runnable

See Also:

java.lang.Thread#start(), java.lang.Thread#stop(), java.lang.Thread#Thread(java.lang.ThreadGroup, java.lang.Runnable, java.lang.String), java.lang.Runnable#run()

exit

private void exit()

This method is called by the system to give a Thread a chance to clean up before it actually exits.

stop

public final void stop()

Deprecated. This method is inherently unsafe. 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 ThreadDeath 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 behavior. Many uses of stop should be replaced by code that simply modifies some 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 (on a condition variable, for example), the interrupt method should be used to interrupt the wait. For more information, see Why are Thread.stop, Thread.suspend and Thread.resume Deprecated?.

Enabled: Forces the thread to stop executing.

If there is a security manager installed, its checkAccess method is called with this as its argument. This may result in a SecurityException being raised (in the current thread).

If this thread is different from the current thread (that is, the current thread is trying to stop a thread other than itself), the security manager's checkPermission method (with a RuntimePermission("stopThread") argument) is called in addition. Again, this may result in throwing a SecurityException (in the current thread).

The thread represented by this thread is forced to stop whatever it is doing abnormally and to throw a newly created ThreadDeath object as an exception.

It is permitted to stop a thread that has not yet been started. If the thread is eventually started, it immediately terminates.

An application should not normally try to catch ThreadDeath unless it must do some extraordinary cleanup operation (note that the throwing of ThreadDeath causes finally clauses of try statements to be executed before the thread officially dies). If a catch clause catches a ThreadDeath object, it is important to rethrow the object so that the thread actually dies.

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 ThreadDeath.

See Also:

java.lang.Thread#interrupt(), java.lang.Thread#checkAccess(), java.lang.Thread#run(), java.lang.Thread#start(), java.lang.ThreadDeath, java.lang.ThreadGroup#uncaughtException(java.lang.Thread, java.lang.Throwable), SecurityManager.checkAccess(Thread), SecurityManager.checkPermission(java.security.Permission)

stop

public final void stop(Throwable obj)

Deprecated. This method is inherently unsafe. See stop() (with no arguments) for details. An additional danger of this method is that it may be used to generate exceptions that the target thread is unprepared to handle (including checked exceptions that the thread could not possibly throw, were it not for this method). For more information, see Why are Thread.stop, Thread.suspend and Thread.resume Deprecated?.

Enabled: Forces the thread to stop executing.

If there is a security manager installed, the checkAccess method of this thread is called, which may result in a SecurityException being raised (in the current thread).

If this thread is different from the current thread (that is, the current thread is trying to stop a thread other than itself) or obj is not an instance of ThreadDeath, the security manager's checkPermission method (with the RuntimePermission("stopThread") argument) is called in addition. Again, this may result in throwing a SecurityException (in the current thread).

If the argument obj is null, a NullPointerException is thrown (in the current thread).

The thread represented by this thread is forced to complete whatever it is doing abnormally and to throw the Throwable object obj as an exception. This is an unusual action to take; normally, the stop method that takes no arguments should be used.

It is permitted to stop a thread that has not yet been started. If the thread is eventually started, it immediately terminates.

Parameters:

obj - the Throwable object to be thrown.

See Also:

java.lang.Thread#interrupt(), java.lang.Thread#checkAccess(), java.lang.Thread#run(), java.lang.Thread#start(), java.lang.Thread#stop(), SecurityManager.checkAccess(Thread), SecurityManager.checkPermission(java.security.Permission)

interrupt

public void interrupt()

Enabled: Interrupts this thread.

First the checkAccess method of this thread is invoked, which may cause a SecurityException to be thrown.

If this thread is blocked in an invocation of the wait(), wait(long), or wait(long, int) methods of the Object class, or of the join(), join(long), join(long, int), sleep(long), or sleep(long, int), methods of this class, then its interrupt status will be cleared and it will receive an InterruptedException.

If this thread is blocked in an I/O operation upon an interruptible channel then the channel will be closed, the thread's interrupt status will be set, and the thread will receive a java.nio.channels.ClosedByInterruptException.

If this thread is blocked in a java.nio.channels.Selector then the thread's interrupt status will be set and it will return immediately from the selection operation, possibly with a non-zero value, just as if the selector's wakeup method were invoked.

If none of the previous conditions hold then this thread's interrupt status will be set.

Throws:

SecurityException - if the current thread cannot modify this thread

interrupted

public static boolean interrupted()

Enabled: Tests whether the current thread has been interrupted. The interrupted status of the thread is cleared by this method. In other words, if this method were to be called twice in succession, the second call would return false (unless the current thread were interrupted again, after the first call had cleared its interrupted status and before the second call had examined it).

Returns:

true if the current thread has been interrupted; false otherwise.

See Also:

java.lang.Thread#isInterrupted()

isInterrupted

public boolean isInterrupted()

Enabled: Tests whether this thread has been interrupted. The interrupted status of the thread is unaffected by this method.

Returns:

true if this thread has been interrupted; false otherwise.

See Also:

java.lang.Thread#interrupted()

isInterrupted

private boolean isInterrupted(boolean ClearInterrupted)

Tests if some Thread has been interrupted. The interrupted state is reset or not based on the value of ClearInterrupted that is passed.

destroy

public void destroy()

Enabled: Destroys this thread, without any cleanup. Any monitors it has locked remain locked. (This method is not implemented.)

isAlive

public final boolean isAlive()

Enabled: Tests if this thread is alive. A thread is alive if it has been started and has not yet died.

Returns:

true if this thread is alive; false otherwise.

suspend

public final void suspend()

Deprecated. This method has been deprecated, as it is inherently deadlock-prone. If the target thread holds a lock on the monitor protecting a critical system resource when it is suspended, no thread can access this resource until the target thread is resumed. If the thread that would resume the target thread attempts to lock this monitor prior to calling resume, deadlock results. Such deadlocks typically manifest themselves as "frozen" processes. For more information, see Why are Thread.stop, Thread.suspend and Thread.resume Deprecated?.

Enabled: Suspends this thread.

First, the checkAccess method of this thread is called with no arguments. This may result in throwing a SecurityException (in the current thread).

If the thread is alive, it is suspended and makes no further progress unless and until it is resumed.

See Also:

checkAccess()

resume

public final void resume()

Deprecated. This method exists solely for use with suspend(), which has been deprecated because it is deadlock-prone. For more information, see Why are Thread.stop, Thread.suspend and Thread.resume Deprecated?.

Enabled: Resumes a suspended thread.

First, the checkAccess method of this thread is called with no arguments. This may result in throwing a SecurityException (in the current thread).

If the thread is alive but suspended, it is resumed and is permitted to make progress in its execution.

See Also:

checkAccess(), java.lang.Thread#suspend()

setPriority

public final void setPriority(int newPriority)

Enabled: Changes the priority of this thread.

First the checkAccess method of this thread is called with no arguments. This may result in throwing a SecurityException.

Otherwise, the priority of this thread is set to the smaller of the specified newPriority and the maximum permitted priority of the thread's thread group.

Parameters:

newPriority - priority to set this thread to

See Also:

getPriority(), java.lang.Thread#checkAccess(), java.lang.Thread#getPriority(), java.lang.Thread#getThreadGroup(), java.lang.Thread#MAX_PRIORITY, java.lang.Thread#MIN_PRIORITY, java.lang.ThreadGroup#getMaxPriority()

getPriority

public final int getPriority()

Enabled: Returns this thread's priority.

Returns:

this thread's priority.

See Also:

setPriority(int), java.lang.Thread#setPriority(int)

setName

public final void setName(String name)

Enabled: Changes the name of this thread to be equal to the argument name.

First the checkAccess method of this thread is called with no arguments. This may result in throwing a SecurityException.

Parameters:

name - the new name for this thread.

See Also:

getName(), java.lang.Thread#checkAccess(), java.lang.Thread#getName()

getName

public final String getName()

Enabled: Returns this thread's name.

Returns:

this thread's name.

See Also:

setName(java.lang.String), java.lang.Thread#setName(java.lang.String)

getThreadGroup

public final ThreadGroup getThreadGroup()

Enabled: Returns the thread group to which this thread belongs. This method returns null if this thread has died (been stopped).

Returns:

this thread's thread group.

activeCount

public static int activeCount()

Enabled: Returns the number of active threads in the current thread's thread group.

Returns:

the number of active threads in the current thread's thread group.

enumerate

public static int enumerate(Thread[] tarray)

Enabled: Copies into the specified array every active thread in the current thread's thread group and its subgroups. This method simply calls the enumerate method of the current thread's thread group with the array argument.

First, if there is a security manager, that enumerate method calls the security manager's checkAccess method with the thread group as its argument. This may result in throwing a SecurityException.

Parameters:

tarray - an array of Thread objects to copy to

Returns:

the number of threads put into the array

See Also:

java.lang.ThreadGroup#enumerate(java.lang.Thread[]), java.lang.SecurityManager#checkAccess(java.lang.ThreadGroup)

countStackFrames

public int countStackFrames()

Deprecated. The definition of this call depends on suspend(), which is deprecated. Further, the results of this call were never well-defined.

Enabled: Counts the number of stack frames in this thread. The thread must be suspended.

Returns:

the number of stack frames in this thread.

join

public final void join(long millis)
                throws InterruptedException

Enabled: Waits at most millis milliseconds for this thread to die. A timeout of 0 means to wait forever.

Parameters:

millis - the time to wait in milliseconds.

InterruptedException

join

public final void join(long millis,
                       int nanos)
                throws InterruptedException

Enabled: Waits at most millis milliseconds plus nanos nanoseconds for this thread to die.

Parameters:

millis - the time to wait in milliseconds.

nanos - 0-999999 additional nanoseconds to wait.

InterruptedException

join

public final void join()
                throws InterruptedException

Enabled: Waits for this thread to die.

InterruptedException

dumpStack

public static void dumpStack()

Enabled: Prints a stack trace of the current thread. This method is used only for debugging.

See Also:

java.lang.Throwable#printStackTrace()

setDaemon

public final void setDaemon(boolean on)

Enabled: 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.

This method must be called before the thread is started.

This method first calls the checkAccess method of this thread with no arguments. This may result in throwing a SecurityException (in the current thread).

Parameters:

on - if true, marks this thread as a daemon thread.

See Also:

java.lang.Thread#isDaemon(), checkAccess()

isDaemon

public final boolean isDaemon()

Enabled: Tests if this thread is a daemon thread.

Returns:

true if this thread is a daemon thread; false otherwise.

See Also:

java.lang.Thread#setDaemon(boolean)

checkAccess

public final void checkAccess()

Enabled: Determines if the currently running thread has permission to modify this thread.

If there is a security manager, its checkAccess method is called with this thread as its argument. This may result in throwing a SecurityException.

Note: This method was mistakenly non-final in JDK 1.1. It has been made final in the Java 2 Platform.

See Also:

java.lang.SecurityManager#checkAccess(java.lang.Thread)

toString

public String toString()

Suppressed: Returns a string representation of this thread, including the thread's name, priority, and thread group.

Overrides:

toString in class Object

Returns:

a string representation of this thread.

getContextClassLoader

public ClassLoader getContextClassLoader()

Enabled: Returns the context ClassLoader for this Thread. The context ClassLoader is provided by the creator of the thread for use by code running in this thread when loading classes and resources. If not set, the default is the ClassLoader context of the parent Thread. The context ClassLoader of the primordial thread is typically set to the class loader used to load the application.

First, if there is a security manager, and the caller's class loader is not null and the caller's class loader is not the same as or an ancestor of the context class loader for the thread whose context class loader is being requested, then the security manager's checkPermission method is called with a RuntimePermission("getClassLoader") permission to see if it's ok to get the context ClassLoader..

Returns:

the context ClassLoader for this Thread

Throws:

SecurityException - if a security manager exists and its checkPermission method doesn't allow getting the context ClassLoader.

Since:

1.2

See Also:

setContextClassLoader(java.lang.ClassLoader), SecurityManager.checkPermission(java.security.Permission), java.lang.RuntimePermission

setContextClassLoader

public void setContextClassLoader(ClassLoader cl)

Enabled: Sets the context ClassLoader for this Thread. The context ClassLoader can be set when a thread is created, and allows the creator of the thread to provide the appropriate class loader to code running in the thread when loading classes and resources.

First, if there is a security manager, its checkPermission method is called with a RuntimePermission("setContextClassLoader") permission to see if it's ok to set the context ClassLoader..

Parameters:

cl - the context ClassLoader for this Thread

Since:

1.2

See Also:

getContextClassLoader(), SecurityManager.checkPermission(java.security.Permission), java.lang.RuntimePermission

holdsLock

public static boolean holdsLock(Object obj)

Enabled: Returns true if and only if the current thread holds the monitor lock on the specified object.

This method is designed to allow a program to assert that the current thread already holds a specified lock:

     assert Thread.holdsLock(obj);
 

Parameters:

obj - the object on which to test lock ownership

Returns:

true if the current thread holds the monitor lock on the specified object.

Throws:

NullPointerException - if obj is null

Since:

1.4

setPriority0

private void setPriority0(int newPriority)

stop0

private void stop0(Object o)

suspend0

private void suspend0()

resume0

private void resume0()

interrupt0

private void interrupt0()