https://openjdk.java.net/ 
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 *
 * This code 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
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 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package com.sun.jdi;
import java.util.List;


A thread object from the target VM. A ThreadReference is an ObjectReference with additional access to thread-specific information from the target VM. 
Author:Robert Field, Gordon Hirsch, James McIlree
Since: 1.3
/**
 * A thread object from the target VM.
 * A ThreadReference is an {@link ObjectReference} with additional
 * access to thread-specific information from the target VM.
 *
 * @author Robert Field
 * @author Gordon Hirsch
 * @author James McIlree
 * @since  1.3
 */
public interface ThreadReference extends ObjectReference {
    
Thread status is unknown 
/** Thread status is unknown */
    public final int THREAD_STATUS_UNKNOWN  =-1;
    
Thread has completed execution 
/** Thread has completed execution */
    public final int THREAD_STATUS_ZOMBIE = 0;
    
Thread is runnable 
/** Thread is runnable */
    public final int THREAD_STATUS_RUNNING = 1;
    
Thread is sleeping - Thread.sleep() or JVM_Sleep() was called 
/** Thread is sleeping - Thread.sleep() or JVM_Sleep() was called */
    public final int THREAD_STATUS_SLEEPING = 2;
    
Thread is waiting on a java monitor 
/** Thread is waiting on a java monitor */
    public final int THREAD_STATUS_MONITOR = 3;
    
Thread is waiting - Object.wait() or JVM_MonitorWait() was called 
/** Thread is waiting - Object.wait() or JVM_MonitorWait() was called */
    public final int THREAD_STATUS_WAIT = 4;
    
Thread has not yet been started 
/** Thread has not yet been started */
    public final int THREAD_STATUS_NOT_STARTED = 5;

    
Returns the name of this thread.

Returns:the string containing the thread name.
/**
     * Returns the name of this thread.
     *
     * @return the string containing the thread name.
     */
    String name();

    
Suspends this thread. The thread can be resumed through resume or resumed with other threads through VirtualMachine.resume. 
 Unlike Thread.suspend, suspends of both the virtual machine and individual threads are counted. Before a thread will run again, it must be resumed (through resume or resume) the same number of times it has been suspended. 
 Suspending single threads with this method has the same dangers as Thread.suspend(). If the suspended thread holds a monitor needed by another running thread, deadlock is possible in the target VM (at least until the suspended thread is resumed again). 
 The suspended thread is guaranteed to remain suspended until resumed through one of the JDI resume methods mentioned above; the application in the target VM cannot resume the suspended thread through Thread.resume. 
Throws:
/**
     * Suspends this thread. The thread can be resumed through
     * {@link #resume} or resumed with other threads through
     * {@link VirtualMachine#resume}.
     * <p>
     * Unlike {@link java.lang.Thread#suspend},
     * suspends of both the virtual machine and individual threads are
     * counted. Before a thread will run again, it must be resumed
     * (through {@link #resume} or {@link ThreadReference#resume})
     * the same number of times it has been suspended.
     * <p>
     * Suspending single threads with this method has the same dangers
     * as {@link java.lang.Thread#suspend()}. If the suspended thread
     * holds a monitor needed by another running thread, deadlock is
     * possible in the target VM (at least until the suspended thread
     * is resumed again).
     * <p>
     * The suspended thread is guaranteed to remain suspended until
     * resumed through one of the JDI resume methods mentioned above;
     * the application in the target VM cannot resume the suspended thread
     * through {@link java.lang.Thread#resume}.
     * @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}.
     */
    void suspend();

    
Resumes this thread. If this thread was not previously suspended through suspend or through VirtualMachine.suspend, or because of a SUSPEND_ALL or SUSPEND_EVENT_THREAD event, then invoking this method has no effect. Otherwise, the count of pending suspends on this thread is decremented. If it is decremented to 0, the thread will continue to execute. Note: the normal way to resume from an event related suspension is via EventSet.resume. 
Throws:
/**
     * Resumes this thread. If this thread was not previously suspended
     * through {@link #suspend} or through {@link VirtualMachine#suspend},
     * or because of a SUSPEND_ALL or SUSPEND_EVENT_THREAD event, then
     * invoking this method has no effect. Otherwise, the count of pending
     * suspends on this thread is decremented. If it is decremented to 0,
     * the thread will continue to execute.
     * Note: the normal way to resume from an event related suspension is
     * via {@link com.sun.jdi.event.EventSet#resume}.
     * @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}.
     */
    void resume();

    
Returns the number of pending suspends for this thread. See suspend for an explanation of counted suspends. 
Returns:pending suspend count as an integer
/**
     * Returns the number of pending suspends for this thread. See
     * {@link #suspend} for an explanation of counted suspends.
     * @return pending suspend count as an integer
     */
    int suspendCount();

    
Stops this thread with an asynchronous exception. A debugger thread in the target VM will stop this thread with the given Throwable object. 
Params:
  • throwable – the asynchronous exception to throw.
Throws:
See Also:
/**
     * Stops this thread with an asynchronous exception.
     * A debugger thread in the target VM will stop this thread
     * with the given {@link java.lang.Throwable} object.
     *
     * @param throwable the asynchronous exception to throw.
     * @throws InvalidTypeException if <code>throwable</code> is not
     * an instance of java.lang.Throwable in the target VM.
     * @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}.
     * @see java.lang.Thread#stop(Throwable)
     */
    void stop(ObjectReference throwable) throws InvalidTypeException;

    
Interrupts this thread unless the thread has been suspended by the
debugger.

Throws:
See Also:
/**
     * Interrupts this thread unless the thread has been suspended by the
     * debugger.
     * @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}.
     *
     * @see java.lang.Thread#interrupt()
     */
    void interrupt();

    
Returns the thread's status. If the thread is not suspended the thread's current status is returned. If the thread is suspended, the thread's status before the suspension is returned (or THREAD_STATUS_UNKNOWN if this information is not available. isSuspended can be used to determine if the thread has been suspended. 
Returns:one of THREAD_STATUS_UNKNOWN, THREAD_STATUS_ZOMBIE, THREAD_STATUS_RUNNING, THREAD_STATUS_SLEEPING, THREAD_STATUS_MONITOR, THREAD_STATUS_WAIT, THREAD_STATUS_NOT_STARTED,
/**
     * Returns the thread's status. If the thread is not suspended the
     * thread's current status is returned. If the thread is suspended, the
     * thread's status before the suspension is returned (or
     * {@link #THREAD_STATUS_UNKNOWN} if this information is not available.
     * {@link #isSuspended} can be used to determine if the thread has been
     * suspended.
     *
     * @return one of
     * {@link #THREAD_STATUS_UNKNOWN},
     * {@link #THREAD_STATUS_ZOMBIE},
     * {@link #THREAD_STATUS_RUNNING},
     * {@link #THREAD_STATUS_SLEEPING},
     * {@link #THREAD_STATUS_MONITOR},
     * {@link #THREAD_STATUS_WAIT},
     * {@link #THREAD_STATUS_NOT_STARTED},
     */
    int status();

    
Determines whether the thread has been suspended by the
the debugger.

Returns:true if the thread is currently suspended;
false otherwise.
/**
     * Determines whether the thread has been suspended by the
     * the debugger.
     *
     * @return <code>true</code> if the thread is currently suspended;
     * <code>false</code> otherwise.
     */
    boolean isSuspended();

    
Determines whether the thread is suspended at a breakpoint.

Returns:true if the thread is currently stopped at
a breakpoint; false otherwise.
/**
     * Determines whether the thread is suspended at a breakpoint.
     *
     * @return <code>true</code> if the thread is currently stopped at
     * a breakpoint; <code>false</code> otherwise.
     */
    boolean isAtBreakpoint();

    
Returns this thread's thread group.

Returns:a ThreadGroupReference that mirrors this thread's thread group in the target VM.
/**
     * Returns this thread's thread group.
     * @return a {@link ThreadGroupReference} that mirrors this thread's
     * thread group in the target VM.
     */
    ThreadGroupReference threadGroup();

    
Returns the number of stack frames in the thread's current
call stack.
The thread must be suspended (normally through an interruption
to the VM) to get this information, and
it is only valid until the thread is resumed again.

Throws:
Returns:an integer frame count
/**
     * Returns the number of stack frames in the thread's current
     * call stack.
     * The thread must be suspended (normally through an interruption
     * to the VM) to get this information, and
     * it is only valid until the thread is resumed again.
     *
     * @return an integer frame count
     * @throws IncompatibleThreadStateException if the thread is
     * not suspended in the target VM
     */
    int frameCount() throws IncompatibleThreadStateException;

    
Returns a List containing each StackFrame in the thread's current call stack. The thread must be suspended (normally through an interruption to the VM) to get this information, and it is only valid until the thread is resumed again. 
Throws:
Returns:a List of StackFrame with the current frame first followed by each caller's frame.
/**
     * Returns a List containing each {@link StackFrame} in the
     * thread's current call stack.
     * The thread must be suspended (normally through an interruption
     * to the VM) to get this information, and
     * it is only valid until the thread is resumed again.
     *
     * @return a List of {@link StackFrame} with the current frame first
     * followed by each caller's frame.
     * @throws IncompatibleThreadStateException if the thread is
     * not suspended in the target VM
     */
    List<StackFrame> frames() throws IncompatibleThreadStateException;

    
Returns the StackFrame at the given index in the thread's current call stack. Index 0 retrieves the current frame; higher indices retrieve caller frames. The thread must be suspended (normally through an interruption to the VM) to get this information, and it is only valid until the thread is resumed again. 
Params:
  • index – the desired frame
Throws:
Returns:the requested StackFrame
/**
     * Returns the {@link StackFrame} at the given index in the
     * thread's current call stack. Index 0 retrieves the current
     * frame; higher indices retrieve caller frames.
     * The thread must be suspended (normally through an interruption
     * to the VM) to get this information, and
     * it is only valid until the thread is resumed again.
     *
     * @param index the desired frame
     * @return the requested {@link StackFrame}
     * @throws IncompatibleThreadStateException if the thread is
     * not suspended in the target VM
     * @throws java.lang.IndexOutOfBoundsException if the index is greater than
     * or equal to {@link #frameCount} or is negative.
     */
    StackFrame frame(int index) throws IncompatibleThreadStateException;

    
Returns a List containing a range of StackFrame mirrors from the thread's current call stack. The thread must be suspended (normally through an interruption to the VM) to get this information, and it is only valid until the thread is resumed again. 
Params:
  • start – the index of the first frame to retrieve.
      Index 0 represents the current frame.
  • length – the number of frames to retrieve
Throws:
Returns:a List of StackFrame with the current frame first followed by each caller's frame.
/**
     * Returns a List containing a range of {@link StackFrame} mirrors
     * from the thread's current call stack.
     * The thread must be suspended (normally through an interruption
     * to the VM) to get this information, and
     * it is only valid until the thread is resumed again.
     *
     * @param start the index of the first frame to retrieve.
     *       Index 0 represents the current frame.
     * @param length the number of frames to retrieve
     * @return a List of {@link StackFrame} with the current frame first
     * followed by each caller's frame.
     * @throws IncompatibleThreadStateException if the thread is
     * not suspended in the target VM
     * @throws IndexOutOfBoundsException if the specified range is not
     * within the range of stack frame indicies.
     * That is, the exception is thrown if any of the following are true:
     * <pre>    start &lt; 0
     *    start &gt;= {@link #frameCount}
     *    length &lt; 0
     *    (start+length) &gt; {@link #frameCount}</pre>
     */
    List<StackFrame> frames(int start, int length)
        throws IncompatibleThreadStateException;

    
Returns a List containing an ObjectReference for each monitor owned by the thread. A monitor is owned by a thread if it has been entered (via the synchronized statement or entry into a synchronized method) and has not been relinquished through Object.wait. 
 Not all target virtual machines support this operation. Use VirtualMachine.canGetOwnedMonitorInfo() to determine if the operation is supported. 
Throws:
Returns:a List of ObjectReference objects. The list has zero length if no monitors are owned by this thread.
/**
     * Returns a List containing an {@link ObjectReference} for
     * each monitor owned by the thread.
     * A monitor is owned by a thread if it has been entered
     * (via the synchronized statement or entry into a synchronized
     * method) and has not been relinquished through {@link Object#wait}.
     * <p>
     * Not all target virtual machines support this operation.
     * Use {@link VirtualMachine#canGetOwnedMonitorInfo()}
     * to determine if the operation is supported.
     *
     * @return a List of {@link ObjectReference} objects. The list
     * has zero length if no monitors are owned by this thread.
     * @throws java.lang.UnsupportedOperationException if
     * the target virtual machine does not support this
     * operation.
     * @throws IncompatibleThreadStateException if the thread is
     * not suspended in the target VM
     */
    List<ObjectReference> ownedMonitors()
        throws IncompatibleThreadStateException;

    
Returns a List containing a MonitorInfo object for each monitor owned by the thread. A monitor is owned by a thread if it has been entered (via the synchronized statement or entry into a synchronized method) and has not been relinquished through Object.wait. 
 Not all target virtual machines support this operation. Use VirtualMachine.canGetMonitorFrameInfo() to determine if the operation is supported. 
Throws:
Returns:a List of MonitorInfo objects. The list has zero length if no monitors are owned by this thread.
Since:1.6
/**
     * Returns a List containing a {@link MonitorInfo} object for
     * each monitor owned by the thread.
     * A monitor is owned by a thread if it has been entered
     * (via the synchronized statement or entry into a synchronized
     * method) and has not been relinquished through {@link Object#wait}.
     * <p>
     * Not all target virtual machines support this operation.
     * Use {@link VirtualMachine#canGetMonitorFrameInfo()}
     * to determine if the operation is supported.
     *
     * @return a List of {@link MonitorInfo} objects. The list
     * has zero length if no monitors are owned by this thread.
     * @throws java.lang.UnsupportedOperationException if
     * the target virtual machine does not support this
     * operation.
     * @throws IncompatibleThreadStateException if the thread is
     * not suspended in the target VM
     *
     * @since 1.6
     */
    List<MonitorInfo> ownedMonitorsAndFrames()
        throws IncompatibleThreadStateException;

    
Returns an ObjectReference for the monitor, if any, for which this thread is currently waiting. The thread can be waiting for a monitor through entry into a synchronized method, the synchronized statement, or Object.wait. The status method can be used to differentiate between the first two cases and the third. 
 Not all target virtual machines support this operation. Use VirtualMachine.canGetCurrentContendedMonitor() to determine if the operation is supported. 
Throws:
Returns:the ObjectReference corresponding to the contended monitor, or null if it is not waiting for a monitor.
/**
     * Returns an {@link ObjectReference} for the monitor, if any,
     * for which this thread is currently waiting.
     * The thread can be waiting for a monitor through entry into a
     * synchronized method, the synchronized statement, or
     * {@link Object#wait}.  The {@link #status} method can be used
     * to differentiate between the first two cases and the third.
     * <p>
     * Not all target virtual machines support this operation.
     * Use {@link VirtualMachine#canGetCurrentContendedMonitor()}
     * to determine if the operation is supported.
     *
     * @return the {@link ObjectReference} corresponding to the
     * contended monitor, or null if it is not waiting for a monitor.
     * @throws java.lang.UnsupportedOperationException if
     * the target virtual machine does not support this
     * operation.
     * @throws IncompatibleThreadStateException if the thread is
     * not suspended in the target VM
     */
    ObjectReference currentContendedMonitor() throws IncompatibleThreadStateException;

    
Pop stack frames.


All frames up to and including the frame are
popped off the stack.
The frame previous to the parameter frame
will become the current frame.


After this operation, this thread will be
suspended at the invoke instruction of the target method
that created frame.
The frame's method can be reentered with a step into
the instruction.


The operand stack is restored, however, any changes
to the arguments that occurred in the called method, remain.
For example, if the method foo:

   void foo(int x) {
       System.out.println("Foo: " + x);
       x = 4;
       System.out.println("pop here");
   }


was called with foo(7) and foo
is popped at the second println and resumed,
it will print: Foo: 4.


Locks acquired by a popped frame are released when it
is popped. This applies to synchronized methods that
are popped, and to any synchronized blocks within them.


Finally blocks are not executed.


No aspect of state, other than this thread's execution point and
locks, is affected by this call.  Specifically, the values of
fields are unchanged, as are external resources such as
I/O streams.  Additionally, the target program might be
placed in a state that is impossible with normal program flow;
for example, order of lock acquisition might be perturbed.
Thus the target program may
proceed differently than the user would expect.


The specified thread must be suspended.


All StackFrame objects for this thread are
invalidated.


No events are generated by this method.


None of the frames through and including the frame for the caller
of frame may be native.

 Not all target virtual machines support this operation. Use VirtualMachine.canPopFrames() to determine if the operation is supported. 
Params:
  • frame – Stack frame to pop.  frame is on this
thread's call stack.
Throws:
Since:1.4
/**
     * Pop stack frames.
     * <P>
     * All frames up to and including the <CODE>frame</CODE> are
     * popped off the stack.
     * The frame previous to the parameter <CODE>frame</CODE>
     * will become the current frame.
     * <P>
     * After this operation, this thread will be
     * suspended at the invoke instruction of the target method
     * that created <CODE>frame</CODE>.
     * The <CODE>frame</CODE>'s method can be reentered with a step into
     * the instruction.
     * <P>
     * The operand stack is restored, however, any changes
     * to the arguments that occurred in the called method, remain.
     * For example, if the method <CODE>foo</CODE>:
     * <PRE>
     *    void foo(int x) {
     *        System.out.println("Foo: " + x);
     *        x = 4;
     *        System.out.println("pop here");
     *    }
     * </PRE>
     * was called with <CODE>foo(7)</CODE> and <CODE>foo</CODE>
     * is popped at the second <CODE>println</CODE> and resumed,
     * it will print: <CODE>Foo: 4</CODE>.
     * <P>
     * Locks acquired by a popped frame are released when it
     * is popped. This applies to synchronized methods that
     * are popped, and to any synchronized blocks within them.
     * <P>
     * Finally blocks are not executed.
     * <P>
     * No aspect of state, other than this thread's execution point and
     * locks, is affected by this call.  Specifically, the values of
     * fields are unchanged, as are external resources such as
     * I/O streams.  Additionally, the target program might be
     * placed in a state that is impossible with normal program flow;
     * for example, order of lock acquisition might be perturbed.
     * Thus the target program may
     * proceed differently than the user would expect.
     * <P>
     * The specified thread must be suspended.
     * <P>
     * All <code>StackFrame</code> objects for this thread are
     * invalidated.
     * <P>
     * No events are generated by this method.
     * <P>
     * None of the frames through and including the frame for the caller
     * of <i>frame</i> may be native.
     * <P>
     * Not all target virtual machines support this operation.
     * Use {@link VirtualMachine#canPopFrames() VirtualMachine.canPopFrames()}
     * to determine if the operation is supported.
     *
     * @param frame Stack frame to pop.  <CODE>frame</CODE> is on this
     * thread's call stack.
     *
     * @throws java.lang.UnsupportedOperationException if
     * the target virtual machine does not support this
     * operation - see
     * {@link VirtualMachine#canPopFrames() VirtualMachine.canPopFrames()}.
     *
     * @throws IncompatibleThreadStateException if this
     * thread is not suspended.
     *
     * @throws java.lang.IllegalArgumentException if <CODE>frame</CODE>
     * is not on this thread's call stack.
     *
     * @throws NativeMethodException if one of the frames that would be
     * popped is that of a native method or if the frame previous to
     * <i>frame</i> is native.
     *
     * @throws InvalidStackFrameException if <CODE>frame</CODE> has become
     * invalid. Once this thread is resumed, the stack frame is
     * no longer valid.  This exception is also thrown if there are no
     * more frames.
     * @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}.
     *
     * @since 1.4 */
    void popFrames(StackFrame frame) throws IncompatibleThreadStateException;


    
Force a method to return before it reaches a return
statement.


The method which will return early is referred to as the
called method. The called method is the current method (as
defined by the Frames section in the Java Virtual Machine
Specification) for the specified thread at the time this
method is called.


The thread must be suspended.
The return occurs when execution of Java programming
language code is resumed on this thread. Between the call to
this method and resumption of thread execution, the
state of the stack is undefined.


No further instructions are executed in the called
method. Specifically, finally blocks are not executed. Note:
this can cause inconsistent states in the application.


A lock acquired by calling the called method (if it is a
synchronized method) and locks acquired by entering
synchronized blocks within the called method are
released. Note: this does not apply to native locks or
java.util.concurrent.locks locks.


Events, such as MethodExit, are generated as they would be in
a normal return.


The called method must be a non-native Java programming
language method. Forcing return on a thread with only one
frame on the stack causes the thread to exit when resumed.


The value argument is the value that the method is to return. If the return type of the method is void, then value must be a VoidValue. Object values must be assignment compatible with the method return type (This implies that the method return type must be loaded through the enclosing class's class loader). Primitive values must be either assignment compatible with the method return type or must be convertible to the variable type without loss of information. See JLS section 5.2 for more information on assignment compatibility. 
 Not all target virtual machines support this operation. Use VirtualMachine.canForceEarlyReturn() to determine if the operation is supported. 
Params:
  • value – the value the method is to return.
Throws:
Since:1.6
/**
     * Force a method to return before it reaches a return
     * statement.
     * <p>
     * The method which will return early is referred to as the
     * called method. The called method is the current method (as
     * defined by the Frames section in the Java Virtual Machine
     * Specification) for the specified thread at the time this
     * method is called.
     * <p>
     * The thread must be suspended.
     * The return occurs when execution of Java programming
     * language code is resumed on this thread. Between the call to
     * this method and resumption of thread execution, the
     * state of the stack is undefined.
     * <p>
     * No further instructions are executed in the called
     * method. Specifically, finally blocks are not executed. Note:
     * this can cause inconsistent states in the application.
     * <p>
     * A lock acquired by calling the called method (if it is a
     * synchronized method) and locks acquired by entering
     * synchronized blocks within the called method are
     * released. Note: this does not apply to native locks or
     * java.util.concurrent.locks locks.
     * <p>
     * Events, such as MethodExit, are generated as they would be in
     * a normal return.
     * <p>
     * The called method must be a non-native Java programming
     * language method. Forcing return on a thread with only one
     * frame on the stack causes the thread to exit when resumed.
     * <p>
     * The <code>value</code> argument is the value that the
     * method is to return.
     * If the return type of the method is void, then value must
     * be a  {@link VoidValue VoidValue}.
     * Object values must be assignment compatible with the method return type
     * (This implies that the method return type must be loaded through the
     * enclosing class's class loader). Primitive values must be
     * either assignment compatible with the method return type or must be
     * convertible to the variable type without loss of information.
     * See JLS section 5.2 for more information on assignment
     * compatibility.
     * <p>
     * Not all target virtual machines support this operation.
     * Use {@link VirtualMachine#canForceEarlyReturn()}
     * to determine if the operation is supported.
     *
     * @param value the value the method is to return.
     *
     * @throws java.lang.UnsupportedOperationException if
     * the target virtual machine does not support this
     * operation - see
     * {@link VirtualMachine#canGetInstanceInfo() canForceEarlyReturn()}
     *
     * @throws IncompatibleThreadStateException if this
     * thread is not suspended.
     *
     * @throws NativeMethodException if the frame to be returned from
     * is that of a native method.
     *
     * @throws InvalidStackFrameException if there are no frames.
     *
     * @throws InvalidTypeException if the value's type does not match
     * the method's return type.
     *
     * @throws ClassNotLoadedException if the method's return type has not yet
     * been loaded through the appropriate class loader.
     *
     * @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}.
     *
     * @since 1.6
     */
    void forceEarlyReturn(Value value) throws InvalidTypeException,
                                              ClassNotLoadedException,
                                              IncompatibleThreadStateException;

}