Module jdk.jdi
Package com.sun.jdi

Interface ThreadReference

    • Field Detail

      • THREAD_STATUS_UNKNOWN

        static final int THREAD_STATUS_UNKNOWN
        Thread status is unknown
        See Also:
        Constant Field Values

      • THREAD_STATUS_ZOMBIE

        static final int THREAD_STATUS_ZOMBIE
        Thread has completed execution
        See Also:
        Constant Field Values

      • THREAD_STATUS_RUNNING

        static final int THREAD_STATUS_RUNNING
        Thread is runnable
        See Also:
        Constant Field Values

      • THREAD_STATUS_SLEEPING

        static final int THREAD_STATUS_SLEEPING
        Thread is sleeping - Thread.sleep() or JVM_Sleep() was called
        See Also:
        Constant Field Values

      • THREAD_STATUS_MONITOR

        static final int THREAD_STATUS_MONITOR
        Thread is waiting on a java monitor
        See Also:
        Constant Field Values

      • THREAD_STATUS_WAIT

        static final int THREAD_STATUS_WAIT
        Thread is waiting - Object.wait() or JVM_MonitorWait() was called
        See Also:
        Constant Field Values

      • THREAD_STATUS_NOT_STARTED

        static final int THREAD_STATUS_NOT_STARTED
        Thread has not yet been started
        See Also:
        Constant Field Values

    • Method Detail

      • name

        String name()
        Returns the name of this thread.
        Returns:
        the string containing the thread name.

      • suspend

        void suspend()
        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:
        VMCannotBeModifiedException - if the VirtualMachine is read-only - see VirtualMachine.canBeModified().

      • resume

        void resume()
        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:
        VMCannotBeModifiedException - if the VirtualMachine is read-only - see VirtualMachine.canBeModified().

      • suspendCount

        int suspendCount()
        Returns the number of pending suspends for this thread. See suspend() for an explanation of counted suspends.
        Returns:
        pending suspend count as an integer

      • isSuspended

        boolean isSuspended()
        Determines whether the thread has been suspended by the the debugger.
        Returns:
        true if the thread is currently suspended; false otherwise.

      • isAtBreakpoint

        boolean isAtBreakpoint()
        Determines whether the thread is suspended at a breakpoint.
        Returns:
        true if the thread is currently stopped at a breakpoint; false otherwise.

      • frameCount

        int frameCount()
        throws IncompatibleThreadStateException
        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.
        Returns:
        an integer frame count
        Throws:
        IncompatibleThreadStateException - if the thread is not suspended in the target VM

      • frames

        List<StackFrame> frames()
                 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.
        Returns:
        a List of StackFrame with the current frame first followed by each caller's frame.
        Throws:
        IncompatibleThreadStateException - if the thread is not suspended in the target VM

      • frames

        List<StackFrame> frames​(int start,
                        int length)
                 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.
        Parameters:
        start - the index of the first frame to retrieve. Index 0 represents the current frame.
        length - the number of frames to retrieve
        Returns:
        a List of StackFrame with the current frame first followed by each caller's frame.
        Throws:
        IncompatibleThreadStateException - if the thread is not suspended in the target VM
        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: 
            start < 0
    start >= frameCount()
    length < 0
    (start+length) > frameCount()

      • popFrames

        void popFrames​(StackFrame frame)
        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.

        Parameters:
        frame - Stack frame to pop. frame is on this thread's call stack.
        Throws:
        UnsupportedOperationException - if the target virtual machine does not support this operation - see VirtualMachine.canPopFrames().
        IncompatibleThreadStateException - if this thread is not suspended.
        IllegalArgumentException - if frame is not on this thread's call stack.
        NativeMethodException - if one of the frames that would be popped is that of a native method or if the frame previous to frame is native.
        InvalidStackFrameException - if frame 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.
        VMCannotBeModifiedException - if the VirtualMachine is read-only - see VirtualMachine.canBeModified().
        Since:
        1.4

      • forceEarlyReturn

        void forceEarlyReturn​(Value value)
               throws InvalidTypeException,
                      ClassNotLoadedException,
                      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.

        Parameters:
        value - the value the method is to return.
        Throws:
        UnsupportedOperationException - if the target virtual machine does not support this operation - see canForceEarlyReturn()
        IncompatibleThreadStateException - if this thread is not suspended.
        NativeMethodException - if the frame to be returned from is that of a native method.
        InvalidStackFrameException - if there are no frames.
        InvalidTypeException - if the value's type does not match the method's return type.
        ClassNotLoadedException - if the method's return type has not yet been loaded through the appropriate class loader.
        VMCannotBeModifiedException - if the VirtualMachine is read-only - see VirtualMachine.canBeModified().
        Since:
        1.6