gnu.java.lang.management

Class VMThreadMXBeanImpl

java.lang.Object

gnu.java.lang.management.VMThreadMXBeanImpl

final class VMThreadMXBeanImpl
extends Object

Constructor Summary

Constructors

Constructor and Description
VMThreadMXBeanImpl()

Method Summary

Modifier and Type	Method and Description
(package private) static long[]	findDeadlockedThreads() Returns the ids of deadlocked threads occurring due to either monitor or ownable synchronizer ownership.
(package private) static long[]	findMonitorDeadlockedThreads() Returns the ids of deadlocked threads occurring due to monitor ownership.
(package private) static long[]	getAllThreadIds() Returns the identifiers of all live threads.
(package private) static long	getCurrentThreadCpuTime() Returns the number of nanoseconds of CPU time the current thread has used, if supported.
(package private) static long	getCurrentThreadUserTime() Returns the number of nanoseconds of user time the current thread has used, if supported.
(package private) static int	getDaemonThreadCount() Returns the number of live daemon threads.
private static long	getIDForCurrentThread()
(package private) static void	getLockInfo(ThreadInfo info) Fills out the information on ownable synchronizers in the given ThreadInfo object if supported.
(package private) static void	getMonitorInfo(ThreadInfo info) Fills out the information on monitor usage in the given ThreadInfo object if supported.
(package private) static int	getPeakThreadCount() Returns the current peak number of live threads.
(package private) static int	getThreadCount() Returns the current number of live threads.
(package private) static long	getThreadCpuTime(long id) Returns the number of nanoseconds of CPU time the given thread has used, if supported.
private static Thread	getThreadForId(long id) Returns the Thread instance for the given thread id.
(package private) static ThreadInfo	getThreadInfoForId(long id, int maxDepth) Returns a ThreadInfo object for the given thread id with a stack trace to the given depth (0 for empty, Integer.MAX_VALUE for full).
(package private) static long	getThreadUserTime(long id) Returns the number of nanoseconds of user time the given thread has used, if supported.
(package private) static long	getTotalStartedThreadCount() Returns the number of threads started.
(package private) static void	resetPeakThreadCount() Resets the peak thread count.

Methods inherited from class java.lang.Object

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

Constructor Detail

VMThreadMXBeanImpl

VMThreadMXBeanImpl()

Method Detail

findDeadlockedThreads

static long[] findDeadlockedThreads()

Returns the ids of deadlocked threads occurring due to either monitor or ownable synchronizer ownership. Only called if ownable synchronizer monitoring is supported.

Returns:

an array of thread identifiers.

findMonitorDeadlockedThreads

static long[] findMonitorDeadlockedThreads()

Returns the ids of deadlocked threads occurring due to monitor ownership.

Returns:

an array of thread identifiers.

getAllThreadIds

static long[] getAllThreadIds()

Returns the identifiers of all live threads.

Returns:

an array of thread identifiers.

getCurrentThreadCpuTime

static long getCurrentThreadCpuTime()

Returns the number of nanoseconds of CPU time the current thread has used, if supported.

Returns:

the number of nanoseconds.

getIDForCurrentThread

private static long getIDForCurrentThread()

getCurrentThreadUserTime

static long getCurrentThreadUserTime()

Returns the number of nanoseconds of user time the current thread has used, if supported.

Returns:

the number of nanoseconds.

getDaemonThreadCount

static int getDaemonThreadCount()

Returns the number of live daemon threads.

Returns:

the number of live daemon threads.

getLockInfo

static void getLockInfo(ThreadInfo info)

Fills out the information on ownable synchronizers in the given ThreadInfo object if supported.

Parameters:

info - the object to fill in.

getMonitorInfo

static void getMonitorInfo(ThreadInfo info)

Fills out the information on monitor usage in the given ThreadInfo object if supported.

Parameters:

info - the object to fill in.

getPeakThreadCount

static int getPeakThreadCount()

Returns the current peak number of live threads.

Returns:

the current peak.

getThreadCount

static int getThreadCount()

Returns the current number of live threads.

Returns:

the current number of live threads.

getThreadCpuTime

static long getThreadCpuTime(long id)

Returns the number of nanoseconds of CPU time the given thread has used, if supported.

Parameters:

id - the id of the thread to probe.

Returns:

the number of nanoseconds.

getThreadInfoForId

static ThreadInfo getThreadInfoForId(long id,
                                     int maxDepth)

Returns a ThreadInfo object for the given thread id with a stack trace to the given depth (0 for empty, Integer.MAX_VALUE for full).

Parameters:

id - the id of the thread whose info should be returned.

maxDepth - the depth of the stack trace.

Returns:

a ThreadInfo instance.

getThreadForId

private static Thread getThreadForId(long id)

Returns the Thread instance for the given thread id.

Parameters:

id - the id of the thread to find.

Returns:

the Thread.

getThreadUserTime

static long getThreadUserTime(long id)

Returns the number of nanoseconds of user time the given thread has used, if supported.

Parameters:

id - the id of the thread to probe.

Returns:

the number of nanoseconds.

getTotalStartedThreadCount

static long getTotalStartedThreadCount()

Returns the number of threads started.

Returns:

the number of started threads.

resetPeakThreadCount

static void resetPeakThreadCount()

Resets the peak thread count.