Module openj9.dtfj

Package com.ibm.dtfj.image

Interface ImageThread

All Known Implementing Classes:

ImageThread, J9DDRBaseImageThread, J9DDRImageThread, J9DDRStubImageThread, JCImageThread, PHDCorruptImageThread, PHDImageThread

public interface ImageThread

Represents a native operating system thread.

Method Summary

Modifier and Type	Method	Description
String	getID()	Fetch a unique identifier for the thread.
Properties	getProperties()	Get the OS-specific properties for this thread.
Iterator	getRegisters()	Get the register contents.
Iterator	getStackFrames()	Get the set of stack frames on this thread.
Iterator	getStackSections()	Get the set of image sections which make up the stack.

Method Details

getID

String getID()
      throws CorruptDataException

Fetch a unique identifier for the thread. In many operating systems, threads have more than one identifier (e.g. a thread id, a handle, a pointer to VM structures associated with the thread). In this case, one of these identifiers will be chosen as the canonical one. The other identifiers would be returned by getProperties()

Returns:

a process-wide identifier for the thread (e.g. a tid number)

Throws:

CorruptDataException

getStackFrames

Iterator getStackFrames()
                 throws DataUnavailable

Get the set of stack frames on this thread.

Returns:

an iterator to walk the native stack frames in order from top-of-stack (that is, the most recent frame) to bottom-of-stack. Throws DataUnavailable if native stack frames are not available on this platform.

Throws:

DataUnavailable - If native stack frames are not available on this platform

See Also:

• ImageStackFrame
• CorruptData

getStackSections

Iterator getStackSections()

Get the set of image sections which make up the stack.

Returns:

a collection of ImageSections which make up the stack. On most platforms this consists of a single entry, but on some platforms the thread's stack may consist of non-contiguous sections

See Also:

• ImageSection
• CorruptData

getRegisters

Iterator getRegisters()

Get the register contents.

Returns:

an iterator to iterate over the state of the CPU registers when the image was created. The collection may be empty if the register state is not available for this thread. If the CPU supports partial registers (e.g. AH, AL, AX, EAX, RAX on AMD64), only the largest version of the register will be included

See Also:

• ImageRegister

getProperties

Properties getProperties()

Get the OS-specific properties for this thread.

Returns:

a table of OS-specific properties for this thread. Values which are commonly available include

• "priority" -- the priority of the thread
• "policy" -- the scheduling policy of the thread