org.jikesrvm.scheduler

Class JMXSupport

java.lang.Object

org.jikesrvm.scheduler.JMXSupport

public class JMXSupport
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
private static int	peakThreadCount
private static Lock	peakThreadCountLock
private static long	startedThreadCount
private static Lock	startedThreadCountLock
private static HashMap<Long,Thread>	threadIdToThread

Constructor Summary

Constructors

Constructor and Description
JMXSupport()

Method Summary

Modifier and Type	Method and Description
static long[]	getAllLiveThreadIds()
static int	getLiveDaemonCount()
static int	getLiveThreadCount()
static int	getPeakThreadCount()
static StackTraceElement[]	getStackTraceForThread(RVMThread rvmThread)
static long	getStartedThreadCount()
static Thread	getThreadForId(long id)
static long	getWaitingCount(RVMThread rvmThread)
static long	getWaitingTime(RVMThread rvmThread)
(package private) static void	increaseStartedThreadCount() Increases the number of started threads Note: this must be uninterruptible because it's called from the RVMThread.start() and that method must not have yieldpoints.
static boolean	isInNative(RVMThread t) Checks whether the thread is in native according to JMX.
static boolean	isSuspended(RVMThread t) Checks whether the thread is currently suspended according to JMX.
static void	resetPeakThreadCount()
(package private) static void	updatePeakThreadCount(int liveThreadCount, int numActiveSystemThreads) Updates the current peak thread count.

Methods inherited from class java.lang.Object

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

Field Detail

threadIdToThread

private static HashMap<Long,Thread> threadIdToThread

peakThreadCountLock

private static final Lock peakThreadCountLock

peakThreadCount

private static int peakThreadCount

startedThreadCountLock

private static final Lock startedThreadCountLock

startedThreadCount

private static long startedThreadCount

Constructor Detail

JMXSupport

public JMXSupport()

Method Detail

updatePeakThreadCount

static void updatePeakThreadCount(int liveThreadCount,
                                  int numActiveSystemThreads)

Updates the current peak thread count.

Note: this must be uninterruptible because it's called from the RVMThread.start() and that method must not have yieldpoints.

Parameters:

liveThreadCount - the current count of live threads

numActiveSystemThreads - the current count of live system threads

getPeakThreadCount

public static int getPeakThreadCount()

resetPeakThreadCount

public static void resetPeakThreadCount()

increaseStartedThreadCount

static void increaseStartedThreadCount()

Increases the number of started threads

Note: this must be uninterruptible because it's called from the RVMThread.start() and that method must not have yieldpoints.

getStartedThreadCount

public static long getStartedThreadCount()

getLiveThreadCount

public static int getLiveThreadCount()

getLiveDaemonCount

public static int getLiveDaemonCount()

getAllLiveThreadIds

public static long[] getAllLiveThreadIds()

Returns:

thread ids (those of java.lang.Thread and not of our internal threads!)

getThreadForId

public static Thread getThreadForId(long id)

isInNative

public static boolean isInNative(RVMThread t)

Checks whether the thread is in native according to JMX.

Parameters:

t - a thread

Returns:

whether the thread is executing JNI code

isSuspended

public static boolean isSuspended(RVMThread t)

Checks whether the thread is currently suspended according to JMX.

Parameters:

t - a thread

Returns:

whether Thread.suspend() was called on the thread

getWaitingCount

public static long getWaitingCount(RVMThread rvmThread)

getWaitingTime

public static long getWaitingTime(RVMThread rvmThread)

getStackTraceForThread

public static StackTraceElement[] getStackTraceForThread(RVMThread rvmThread)