Module openj9.dtfj

Package com.ibm.dtfj.java.j9

Class JavaThread

java.lang.Object

com.ibm.dtfj.java.j9.JavaThread

All Implemented Interfaces:

JavaThread

public class JavaThread
extends Object
implements JavaThread

Field Summary

Fields declared in interface com.ibm.dtfj.java.JavaThread

STATE_ALIVE, STATE_BLOCKED_ON_MONITOR_ENTER, STATE_IN_NATIVE, STATE_IN_OBJECT_WAIT, STATE_INTERRUPTED, STATE_PARKED, STATE_RUNNABLE, STATE_SLEEPING, STATE_SUSPENDED, STATE_TERMINATED, STATE_VENDOR_1, STATE_VENDOR_2, STATE_VENDOR_3, STATE_WAITING, STATE_WAITING_INDEFINITELY, STATE_WAITING_WITH_TIMEOUT

Constructor Summary

Constructors

Constructor	Description
JavaThread(JavaRuntime vm, ImagePointer nativeID, ImagePointer objectID, String state, ImageThread imageThread)

Method Summary

Modifier and Type	Method	Description
void	addFrame(Object frame)
JavaStackFrame	addNewStackFrame(long arguments, long method, long pc, int lineNumber)
boolean	equals(Object obj)	Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
JavaObject	getBlockingObject()	For threads that are in STATE_BLOCKED_ON_MONITOR_ENTER this method returns the JavaObject who's monitor they are blocked on.
ImageThread	getImageThread()	Represents the joining point between the Java view of execution and the corresponding native view.
ImagePointer	getJNIEnv()	Get the address of the JNIEnv structure which represents this thread instance in JNI.
String	getName()	Return the name of the thread.
JavaObject	getObject()	Fetch the java.lang.Thread associated with this thread.
int	getPriority()	Get the Java priority of the thread.
Iterator	getStackFrames()	Get the set of stack frames.
Iterator	getStackSections()	Get the set of ImageSections which make up the managed stack.
int	getState()	Get the state of the thread when the image was created.
int	hashCode()	Answers an integer hash code for the receiver.
void	setStackCorrupt()	Called by the parser if it finds an error tag where the stack was expected
void	setStackSection(long base, long size)

Methods declared in class java.lang.Object

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

Constructor Details

JavaThread

public JavaThread(JavaRuntime vm,
 ImagePointer nativeID,
 ImagePointer objectID,
 String state,
 ImageThread imageThread)

Method Details

getJNIEnv

public ImagePointer getJNIEnv()
                       throws CorruptDataException

Description copied from interface: JavaThread

Get the address of the JNIEnv structure which represents this thread instance in JNI.

Specified by:

getJNIEnv in interface JavaThread

Returns:

the address of the JNIEnv structure which represents this thread instance in JNI

Throws:

CorruptDataException

getPriority

public int getPriority()
                throws CorruptDataException

Description copied from interface: JavaThread

Get the Java priority of the thread.

Specified by:

getPriority in interface JavaThread

Returns:

the Java priority of the thread (a number between 1 and 10 inclusive)

Throws:

CorruptDataException

See Also:

• Thread.getPriority()

getObject

public JavaObject getObject()
                     throws CorruptDataException

Description copied from interface: JavaThread

Fetch the java.lang.Thread associated with this thread. If the thread is in the process of being attached, this may return null.

Specified by:

getObject in interface JavaThread

Returns:

the a JavaObject representing the java.lang.Thread associated with this thread

Throws:

CorruptDataException

See Also:

• JavaObject
• Thread

getState

public int getState()
             throws CorruptDataException

Description copied from interface: JavaThread

Get the state of the thread when the image was created.

Specified by:

getState in interface JavaThread

Returns:

the state of the thread when the image was created. The result is a bit vector, and uses the states defined by the JVMTI specification.

Throws:

CorruptDataException

getImageThread

public ImageThread getImageThread()
                           throws CorruptDataException,
DataUnavailable

Description copied from interface: JavaThread

Represents the joining point between the Java view of execution and the corresponding native view. This method is where the mapping from Java into native threading resources is provided.

Specified by:

getImageThread in interface JavaThread

Returns:

the ImageThread which this ManagedThread is currently bound to.

Throws:

CorruptDataException - If the underlying resource describing the native representation of the thread is damaged

DataUnavailable - If no mapping is provided due to missing or limited underlying resources (this exception added in DTFJ 1.1)

See Also:

• ImageThread

getStackSections

public Iterator getStackSections()

Description copied from interface: JavaThread

Get the set of ImageSections which make up the managed stack.

Specified by:

getStackSections in interface JavaThread

Returns:

a collection of ImageSections which make up the managed stack.

Some Runtime implementations may also use parts of the ImageThread's stack for ManagesStackFrames

See Also:

• ImageSection
• ImageThread.getStackSections()
• CorruptData

getStackFrames

public Iterator getStackFrames()

Description copied from interface: JavaThread

Get the set of stack frames.

Specified by:

getStackFrames in interface JavaThread

Returns:

an iterator to walk the managed stack frames in order from top-of-stack (that is, the most recent frame) to bottom-of-stack

See Also:

• JavaStackFrame
• CorruptData

getName

public String getName()
               throws CorruptDataException

Description copied from interface: JavaThread

Return the name of the thread. Usually this is derived from the object associated with the thread, but if the name cannot be derived this way (e.g. there is no object associated with the thread) DTFJ will synthesize a name for the thread.

Specified by:

getName in interface JavaThread

Returns:

the name of the thread

Throws:

CorruptDataException

addFrame

public void addFrame(Object frame)

setStackSection

public void setStackSection(long base,
 long size)

equals

public boolean equals(Object obj)

Description copied from class: java.lang.Object

Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison. The implementation in Object answers true only if the argument is the exact same object as the receiver (==).

Specified by:

equals in interface JavaThread

Overrides:

equals in class Object

Parameters:

obj -

Returns:

True if the given object refers to the same Java Thread in the image

See Also:

• Object.hashCode()

hashCode

public int hashCode()

Description copied from class: java.lang.Object

Answers an integer hash code for the receiver. Any two objects which answer true when passed to .equals must answer the same value for this method.

Specified by:

hashCode in interface JavaThread

Overrides:

hashCode in class Object

Returns:

the receiver's hash.

See Also:

• Object.equals(java.lang.Object)

addNewStackFrame

public JavaStackFrame addNewStackFrame(long arguments,
 long method,
 long pc,
 int lineNumber)

setStackCorrupt

public void setStackCorrupt()

Called by the parser if it finds an error tag where the stack was expected

getBlockingObject

public JavaObject getBlockingObject()
                             throws CorruptDataException,
DataUnavailable

Description copied from interface: JavaThread

For threads that are in STATE_BLOCKED_ON_MONITOR_ENTER this method returns the JavaObject who's monitor they are blocked on. For threads that are in STATE_IN_OBJECT_WAIT this method returns the JavaObject that Object.wait() was called on. For threads that are in STATE_PARKED this method returns the JavaObject that was passed as the "blocker" object to the java.util.concurrent.LockSupport.park() call. It may return null if no blocker object was passed. For threads in any other state this call will return null. The state of the thread can be determined by calling JavaThread.getState()

Specified by:

getBlockingObject in interface JavaThread

Returns:

the object this thread is waiting on or null.

Throws:

CorruptDataException

DataUnavailable