OpenJDK 27 · sun.management.ThreadImpl · APIdia, the JavaDoc alternative

Modifier and Type	Field and Description
private boolean	allocatedMemoryEnabled
private boolean	contentionMonitoringEnabled
private boolean	cpuTimeEnabled
private final VMManagement	jvm

Access	Constructor and Description
protected	ThreadImpl(VMManagement vm) Constructor of ThreadImpl class.

Method Summary

Modifier and Type	Method and Description
public ThreadInfo[]	dumpAllThreads(boolean lockedMonitors, boolean lockedSynchronizers) Implements java.lang.management.ThreadMXBean.dumpAllThreads. Returns the thread info for all live platform threads with stack trace and synchronization information.
public ThreadInfo[]	dumpAllThreads(boolean lockedMonitors, boolean lockedSynchronizers, int maxDepth) Overrides default java.lang.management.ThreadMXBean.dumpAllThreads. Returns the thread info for all live platform threads with stack trace of the specified maximum number of elements and synchronization information.
private static native ThreadInfo[]	dumpThreads0(long[] ids, boolean lockedMonitors, boolean lockedSynchronizers, int maxDepth)
private void	ensureThreadAllocatedMemorySupported()
public long[]	findDeadlockedThreads() Implements java.lang.management.ThreadMXBean.findDeadlockedThreads. Finds cycles of platform threads that are in deadlock waiting to acquire object monitors or ownable synchronizers.
private static native Thread[]	findDeadlockedThreads0()
public long[]	findMonitorDeadlockedThreads() Implements java.lang.management.ThreadMXBean.findMonitorDeadlockedThreads. Finds cycles of platform threads that are in deadlock waiting to acquire object monitors.
private static native Thread[]	findMonitorDeadlockedThreads0()
public long[]	getAllThreadIds() Implements java.lang.management.ThreadMXBean.getAllThreadIds. Returns the threadIDs of all live platform threads.
protected long	getCurrentThreadAllocatedBytes()
public long	getCurrentThreadCpuTime() Implements java.lang.management.ThreadMXBean.getCurrentThreadCpuTime. Returns the total CPU time for the current thread in nanoseconds.
public long	getCurrentThreadUserTime() Implements java.lang.management.ThreadMXBean.getCurrentThreadUserTime. Returns the CPU time that the current thread has executed in user mode in nanoseconds.
public int	getDaemonThreadCount() Implements java.lang.management.ThreadMXBean.getDaemonThreadCount. Returns the current number of live platform threads that are daemon threads.
public ObjectName	getObjectName() Implements java.lang.management.PlatformManagedObject.getObjectName. Returns an `ObjectName` instance representing the object name of this platform managed object.
public int	getPeakThreadCount() Implements java.lang.management.ThreadMXBean.getPeakThreadCount. Returns the peak live platform thread count since the Java virtual machine started or peak was reset.
protected long	getThreadAllocatedBytes(long id)
protected long[]	getThreadAllocatedBytes(long[] ids)
private static native long	getThreadAllocatedMemory0(long id)
private static native void	getThreadAllocatedMemory1(long[] ids, long[] result)
public int	getThreadCount() Implements java.lang.management.ThreadMXBean.getThreadCount. Returns the current number of live platform threads including both daemon and non-daemon threads.
public long	getThreadCpuTime(long id) Implements java.lang.management.ThreadMXBean.getThreadCpuTime. Returns the total CPU time for a thread of the specified ID in nanoseconds.
protected long[]	getThreadCpuTime(long[] ids)
public ThreadInfo	getThreadInfo(long id) Implements java.lang.management.ThreadMXBean.getThreadInfo. Returns the thread info for a thread of the specified `id` with no stack trace.
public ThreadInfo	getThreadInfo(long id, int maxDepth) Implements java.lang.management.ThreadMXBean.getThreadInfo. Returns a thread info for a thread of the specified `id`, with stack trace of a specified number of stack trace elements.
public ThreadInfo[]	getThreadInfo(long[] ids) Implements java.lang.management.ThreadMXBean.getThreadInfo. Returns the thread info for each thread whose ID is in the input array `ids` with no stack trace.
public ThreadInfo[]	getThreadInfo(long[] ids, int maxDepth) Implements java.lang.management.ThreadMXBean.getThreadInfo. Returns the thread info for each thread whose ID is in the input array `ids`, with stack trace of a specified number of stack trace elements.
public ThreadInfo[]	getThreadInfo(long[] ids, boolean lockedMonitors, boolean lockedSynchronizers) Implements java.lang.management.ThreadMXBean.getThreadInfo. Returns the thread info for each thread whose ID is in the input array `ids`, with stack trace and synchronization information.
public ThreadInfo[]	getThreadInfo(long[] ids, boolean lockedMonitors, boolean lockedSynchronizers, int maxDepth) Overrides default java.lang.management.ThreadMXBean.getThreadInfo. Returns the thread info for each thread whose ID is in the input array `ids`, with stack trace of the specified maximum number of elements and synchronization information.
private static native void	getThreadInfo1(long[] ids, int maxDepth, ThreadInfo[] result)
private static native Thread[]	getThreads()
private static native long	getThreadTotalCpuTime0(long id)
private static native void	getThreadTotalCpuTime1(long[] ids, long[] result)
private static native long	getThreadUserCpuTime0(long id)
private static native void	getThreadUserCpuTime1(long[] ids, long[] result)
public long	getThreadUserTime(long id) Implements java.lang.management.ThreadMXBean.getThreadUserTime. Returns the CPU time that a thread of the specified ID has executed in user mode in nanoseconds.
protected long[]	getThreadUserTime(long[] ids)
public long	getTotalStartedThreadCount() Implements java.lang.management.ThreadMXBean.getTotalStartedThreadCount. Returns the total number of platform threads created and also started since the Java virtual machine started.
protected long	getTotalThreadAllocatedBytes()
private static native long	getTotalThreadAllocatedMemory()
public boolean	isCurrentThreadCpuTimeSupported() Implements java.lang.management.ThreadMXBean.isCurrentThreadCpuTimeSupported. Tests if the Java virtual machine supports CPU time measurement from a platform thread with the `getCurrentThreadCpuTime()` and `getCurrentThreadUserTime()` methods.
public boolean	isObjectMonitorUsageSupported() Implements java.lang.management.ThreadMXBean.isObjectMonitorUsageSupported. Tests if the Java virtual machine supports monitoring of object monitor usage.
public boolean	isSynchronizerUsageSupported() Implements java.lang.management.ThreadMXBean.isSynchronizerUsageSupported. Tests if the Java virtual machine supports monitoring of ownable synchronizer usage.
protected boolean	isThreadAllocatedMemoryEnabled()
protected boolean	isThreadAllocatedMemorySupported()
public synchronized boolean	isThreadContentionMonitoringEnabled() Implements java.lang.management.ThreadMXBean.isThreadContentionMonitoringEnabled. Tests if thread contention monitoring is enabled.
public boolean	isThreadContentionMonitoringSupported() Implements java.lang.management.ThreadMXBean.isThreadContentionMonitoringSupported. Tests if the Java virtual machine supports thread contention monitoring.
public boolean	isThreadCpuTimeEnabled() Implements java.lang.management.ThreadMXBean.isThreadCpuTimeEnabled. Tests if thread CPU time measurement is enabled.
public boolean	isThreadCpuTimeSupported() Implements java.lang.management.ThreadMXBean.isThreadCpuTimeSupported. Tests if the Java virtual machine implementation supports CPU time measurement for any platform thread.
private static native void	resetContentionTimes0(long tid)
public void	resetPeakThreadCount() Implements java.lang.management.ThreadMXBean.resetPeakThreadCount. Resets the peak thread count to the current number of live platform threads.
private static native void	resetPeakThreadCount0()
protected void	setThreadAllocatedMemoryEnabled(boolean enable)
private static native void	setThreadAllocatedMemoryEnabled0(boolean enable)
public void	setThreadContentionMonitoringEnabled(boolean enable) Implements java.lang.management.ThreadMXBean.setThreadContentionMonitoringEnabled. Enables or disables thread contention monitoring.
private static native void	setThreadContentionMonitoringEnabled0(boolean enable)
public void	setThreadCpuTimeEnabled(boolean enable) Implements java.lang.management.ThreadMXBean.setThreadCpuTimeEnabled. Enables or disables thread CPU time measurement.
private static native void	setThreadCpuTimeEnabled0(boolean enable)
private static long[]	threadIds(Thread[] threads) Returns the thread identifiers of the threads in the given array.
private long[]	threadsToIds(Thread[] threads) Returns an array of thread identifiers for the threads in the given array.
private boolean	verifyCurrentThreadCpuTime()
private void	verifyDumpThreads(boolean lockedMonitors, boolean lockedSynchronizers)
private boolean	verifyThreadAllocatedMemory(long id)
private boolean	verifyThreadAllocatedMemory(long[] ids)
private boolean	verifyThreadCpuTime(long[] ids)
private void	verifyThreadId(long id)
private void	verifyThreadIds(long[] ids)

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

allocatedMemoryEnabled	back to summary
private boolean allocatedMemoryEnabled

contentionMonitoringEnabled	back to summary
private boolean contentionMonitoringEnabled

cpuTimeEnabled	back to summary
private boolean cpuTimeEnabled

jvm	back to summary
private final VMManagement jvm

ThreadImpl	back to summary
protected ThreadImpl(VMManagement vm) Constructor of ThreadImpl class.

Method Detail

dumpAllThreads back to summary

dumpAllThreads	back to summary
public ThreadInfo[] dumpAllThreads(boolean lockedMonitors, boolean lockedSynchronizers) Implements java.lang.management.ThreadMXBean.dumpAllThreads. Doc from java.lang.management.ThreadMXBean.dumpAllThreads. Returns the thread info for all live platform threads with stack trace and synchronization information. The thread IDs of virtual threads are not included. This method is equivalent to calling: `dumpAllThreads(lockedMonitors, lockedSynchronizers, Integer.MAX_VALUE)` Annotations @Override

public ThreadInfo[] dumpAllThreads(boolean lockedMonitors, boolean lockedSynchronizers)

Implements java.lang.management.ThreadMXBean.dumpAllThreads.

Doc from java.lang.management.ThreadMXBean.dumpAllThreads.

Returns the thread info for all live platform threads with stack trace and synchronization information. The thread IDs of virtual threads are not included. This method is equivalent to calling:

dumpAllThreads(lockedMonitors, lockedSynchronizers, Integer.MAX_VALUE)

Annotations

@Override

dumpAllThreads back to summary

dumpAllThreads	back to summary
public ThreadInfo[] dumpAllThreads(boolean lockedMonitors, boolean lockedSynchronizers, int maxDepth) Overrides default java.lang.management.ThreadMXBean.dumpAllThreads. Doc from java.lang.management.ThreadMXBean.dumpAllThreads. Returns the thread info for all live platform threads with stack trace of the specified maximum number of elements and synchronization information. if `maxDepth == 0`, no stack trace of the thread will be dumped. The thread IDs of virtual threads are not included. Some threads included in the returned array may have been terminated when this method returns. This method returns an array of `ThreadInfo` objects as specified in the `getThreadInfo(long[], boolean, boolean, int)` method. Annotations @Override

public ThreadInfo[] dumpAllThreads(boolean lockedMonitors, boolean lockedSynchronizers, int maxDepth)

Overrides default java.lang.management.ThreadMXBean.dumpAllThreads.

Doc from java.lang.management.ThreadMXBean.dumpAllThreads.

Returns the thread info for all live platform threads with stack trace of the specified maximum number of elements and synchronization information. if maxDepth == 0, no stack trace of the thread will be dumped. The thread IDs of virtual threads are not included. Some threads included in the returned array may have been terminated when this method returns.

This method returns an array of ThreadInfo objects as specified in the getThreadInfo(long[], boolean, boolean, int) method.

Annotations

@Override

dumpThreads0	back to summary
private static native ThreadInfo[] dumpThreads0(long[] ids, boolean lockedMonitors, boolean lockedSynchronizers, int maxDepth)

ensureThreadAllocatedMemorySupported	back to summary
private void ensureThreadAllocatedMemorySupported()

findDeadlockedThreads	back to summary
public long[] findDeadlockedThreads() Implements java.lang.management.ThreadMXBean.findDeadlockedThreads. Doc from java.lang.management.ThreadMXBean.findDeadlockedThreads. Finds cycles of platform threads that are in deadlock waiting to acquire object monitors or ownable synchronizers. Platform threads are deadlocked in a cycle waiting for a lock of these two types if each thread owns one lock while trying to acquire another lock already held by another platform thread in the cycle. Cycles that include virtual threads are not found by this method. This method is designed for troubleshooting use, but not for synchronization control. It might be an expensive operation. Annotations @Override

findDeadlockedThreads

back to summary

public long[] findDeadlockedThreads()

Implements java.lang.management.ThreadMXBean.findDeadlockedThreads.

Doc from java.lang.management.ThreadMXBean.findDeadlockedThreads.

Finds cycles of platform threads that are in deadlock waiting to acquire object monitors or ownable synchronizers. Platform threads are deadlocked in a cycle waiting for a lock of these two types if each thread owns one lock while trying to acquire another lock already held by another platform thread in the cycle. Cycles that include virtual threads are not found by this method.

This method is designed for troubleshooting use, but not for synchronization control. It might be an expensive operation.

Annotations

@Override

findDeadlockedThreads0	back to summary
private static native Thread[] findDeadlockedThreads0()

findMonitorDeadlockedThreads back to summary

findMonitorDeadlockedThreads	back to summary
public long[] findMonitorDeadlockedThreads() Implements java.lang.management.ThreadMXBean.findMonitorDeadlockedThreads. Doc from java.lang.management.ThreadMXBean.findMonitorDeadlockedThreads. Finds cycles of platform threads that are in deadlock waiting to acquire object monitors. That is, platform threads that are blocked waiting to enter a synchronization block or waiting to reenter a synchronization block after an `Object.wait` call, where each platform thread owns one monitor while trying to obtain another monitor already held by another platform thread in a cycle. Cycles that include virtual threads are not found by this method. More formally, a thread is monitor deadlocked if it is part of a cycle in the relation "is waiting for an object monitor owned by". In the simplest case, thread A is blocked waiting for a monitor owned by thread B, and thread B is blocked waiting for a monitor owned by thread A. This method is designed for troubleshooting use, but not for synchronization control. It might be an expensive operation. This method finds deadlocks involving only object monitors. To find deadlocks involving both object monitors and ownable synchronizers, the `findDeadlockedThreads` method should be used. Annotations @Override

public long[] findMonitorDeadlockedThreads()

Implements java.lang.management.ThreadMXBean.findMonitorDeadlockedThreads.

Doc from java.lang.management.ThreadMXBean.findMonitorDeadlockedThreads.

Finds cycles of platform threads that are in deadlock waiting to acquire object monitors. That is, platform threads that are blocked waiting to enter a synchronization block or waiting to reenter a synchronization block after an Object.wait call, where each platform thread owns one monitor while trying to obtain another monitor already held by another platform thread in a cycle. Cycles that include virtual threads are not found by this method.

More formally, a thread is monitor deadlocked if it is part of a cycle in the relation "is waiting for an object monitor owned by". In the simplest case, thread A is blocked waiting for a monitor owned by thread B, and thread B is blocked waiting for a monitor owned by thread A.

This method is designed for troubleshooting use, but not for synchronization control. It might be an expensive operation.

This method finds deadlocks involving only object monitors. To find deadlocks involving both object monitors and ownable synchronizers, the findDeadlockedThreads method should be used.

Annotations

@Override

findMonitorDeadlockedThreads0	back to summary
private static native Thread[] findMonitorDeadlockedThreads0()

getAllThreadIds	back to summary
public long[] getAllThreadIds() Implements java.lang.management.ThreadMXBean.getAllThreadIds. Doc from java.lang.management.ThreadMXBean.getAllThreadIds. Returns the threadIDs of all live platform threads. The thread IDs of virtual threads are not included. Some threads included in the returned array may have been terminated when this method returns. Annotations @Override

getAllThreadIds

back to summary

public long[] getAllThreadIds()

Implements java.lang.management.ThreadMXBean.getAllThreadIds.

Doc from java.lang.management.ThreadMXBean.getAllThreadIds.

Returns the threadIDs of all live platform threads. The thread IDs of virtual threads are not included. Some threads included in the returned array may have been terminated when this method returns.

Annotations

@Override

getCurrentThreadAllocatedBytes	back to summary
protected long getCurrentThreadAllocatedBytes()

getCurrentThreadCpuTime back to summary

getCurrentThreadCpuTime	back to summary
public long getCurrentThreadCpuTime() Implements java.lang.management.ThreadMXBean.getCurrentThreadCpuTime. Doc from java.lang.management.ThreadMXBean.getCurrentThreadCpuTime. Returns the total CPU time for the current thread in nanoseconds. The returned value is of nanoseconds precision but not necessarily nanoseconds accuracy. If the implementation distinguishes between user mode time and system mode time, the returned CPU time is the amount of time that the current thread has executed in user mode or system mode. This is a convenience method for local management use and is equivalent to calling: `getThreadCpuTime`(Thread.currentThread().threadId()); Annotations @Override

public long getCurrentThreadCpuTime()

Implements java.lang.management.ThreadMXBean.getCurrentThreadCpuTime.

Doc from java.lang.management.ThreadMXBean.getCurrentThreadCpuTime.

Returns the total CPU time for the current thread in nanoseconds. The returned value is of nanoseconds precision but not necessarily nanoseconds accuracy. If the implementation distinguishes between user mode time and system mode time, the returned CPU time is the amount of time that the current thread has executed in user mode or system mode.

This is a convenience method for local management use and is equivalent to calling:

  getThreadCpuTime(Thread.currentThread().threadId());

Annotations

@Override

getCurrentThreadUserTime back to summary

getCurrentThreadUserTime	back to summary
public long getCurrentThreadUserTime() Implements java.lang.management.ThreadMXBean.getCurrentThreadUserTime. Doc from java.lang.management.ThreadMXBean.getCurrentThreadUserTime. Returns the CPU time that the current thread has executed in user mode in nanoseconds. The returned value is of nanoseconds precision but not necessarily nanoseconds accuracy. This is a convenience method for local management use and is equivalent to calling: `getThreadUserTime`(Thread.currentThread().threadId()); Annotations @Override

public long getCurrentThreadUserTime()

Implements java.lang.management.ThreadMXBean.getCurrentThreadUserTime.

Doc from java.lang.management.ThreadMXBean.getCurrentThreadUserTime.

Returns the CPU time that the current thread has executed in user mode in nanoseconds. The returned value is of nanoseconds precision but not necessarily nanoseconds accuracy.

This is a convenience method for local management use and is equivalent to calling:

  getThreadUserTime(Thread.currentThread().threadId());

Annotations

@Override

getDaemonThreadCount	back to summary
public int getDaemonThreadCount() Implements java.lang.management.ThreadMXBean.getDaemonThreadCount. Doc from java.lang.management.ThreadMXBean.getDaemonThreadCount. Returns the current number of live platform threads that are daemon threads. The count does not include virtual threads. Annotations @Override

getDaemonThreadCount

back to summary

public int getDaemonThreadCount()

Implements java.lang.management.ThreadMXBean.getDaemonThreadCount.

Doc from java.lang.management.ThreadMXBean.getDaemonThreadCount.

Returns the current number of live platform threads that are daemon threads. The count does not include virtual threads.

Annotations

@Override

getObjectName back to summary

getObjectName	back to summary
public ObjectName getObjectName() Implements java.lang.management.PlatformManagedObject.getObjectName. Doc from java.lang.management.PlatformManagedObject.getObjectName. Returns an `ObjectName` instance representing the object name of this platform managed object. Annotations @Override

public ObjectName getObjectName()

Implements java.lang.management.PlatformManagedObject.getObjectName.

Doc from java.lang.management.PlatformManagedObject.getObjectName.

Returns an ObjectName instance representing the object name of this platform managed object.

Annotations

@Override

getPeakThreadCount	back to summary
public int getPeakThreadCount() Implements java.lang.management.ThreadMXBean.getPeakThreadCount. Doc from java.lang.management.ThreadMXBean.getPeakThreadCount. Returns the peak live platform thread count since the Java virtual machine started or peak was reset. The count does not include virtual threads. Annotations @Override

getPeakThreadCount

back to summary

public int getPeakThreadCount()

Implements java.lang.management.ThreadMXBean.getPeakThreadCount.

Doc from java.lang.management.ThreadMXBean.getPeakThreadCount.

Returns the peak live platform thread count since the Java virtual machine started or peak was reset. The count does not include virtual threads.

Annotations

@Override

getThreadAllocatedBytes	back to summary
protected long getThreadAllocatedBytes(long id)

getThreadAllocatedBytes	back to summary
protected long[] getThreadAllocatedBytes(long[] ids)

getThreadAllocatedMemory0	back to summary
private static native long getThreadAllocatedMemory0(long id)

getThreadAllocatedMemory1	back to summary
private static native void getThreadAllocatedMemory1(long[] ids, long[] result)

getThreadCount	back to summary
public int getThreadCount() Implements java.lang.management.ThreadMXBean.getThreadCount. Doc from java.lang.management.ThreadMXBean.getThreadCount. Returns the current number of live platform threads including both daemon and non-daemon threads. The count does not include virtual threads. Annotations @Override

getThreadCount

back to summary

public int getThreadCount()

Implements java.lang.management.ThreadMXBean.getThreadCount.

Doc from java.lang.management.ThreadMXBean.getThreadCount.

Returns the current number of live platform threads including both daemon and non-daemon threads. The count does not include virtual threads.

Annotations

@Override

getThreadCpuTime back to summary

getThreadCpuTime	back to summary
public long getThreadCpuTime(long id) Implements java.lang.management.ThreadMXBean.getThreadCpuTime. Doc from java.lang.management.ThreadMXBean.getThreadCpuTime. Returns the total CPU time for a thread of the specified ID in nanoseconds. The returned value is of nanoseconds precision but not necessarily nanoseconds accuracy. If the implementation distinguishes between user mode time and system mode time, the returned CPU time is the amount of time that the thread has executed in user mode or system mode. If the thread of the specified ID is a virtual thread, is not alive or does not exist, this method returns `-1`. If CPU time measurement is disabled, this method returns `-1`. A thread is alive if it has been started and has not yet terminated. If CPU time measurement is enabled after the thread has started, the Java virtual machine implementation may choose any time up to and including the time that the capability is enabled as the point where CPU time measurement starts. Annotations @Override

public long getThreadCpuTime(long id)

Implements java.lang.management.ThreadMXBean.getThreadCpuTime.

Doc from java.lang.management.ThreadMXBean.getThreadCpuTime.

Returns the total CPU time for a thread of the specified ID in nanoseconds. The returned value is of nanoseconds precision but not necessarily nanoseconds accuracy. If the implementation distinguishes between user mode time and system mode time, the returned CPU time is the amount of time that the thread has executed in user mode or system mode.

If the thread of the specified ID is a virtual thread, is not alive or does not exist, this method returns -1. If CPU time measurement is disabled, this method returns -1. A thread is alive if it has been started and has not yet terminated.

If CPU time measurement is enabled after the thread has started, the Java virtual machine implementation may choose any time up to and including the time that the capability is enabled as the point where CPU time measurement starts.

Annotations

@Override

getThreadCpuTime	back to summary
protected long[] getThreadCpuTime(long[] ids)

getThreadInfo back to summary

getThreadInfo	back to summary
public ThreadInfo getThreadInfo(long id) Implements java.lang.management.ThreadMXBean.getThreadInfo. Doc from java.lang.management.ThreadMXBean.getThreadInfo. Returns the thread info for a thread of the specified `id` with no stack trace. This method is equivalent to calling: `getThreadInfo(id, 0);` This method returns a `ThreadInfo` object representing the thread information for the thread of the specified ID. The stack trace, locked monitors, and locked synchronizers in the returned `ThreadInfo` object will be empty. If a thread of the given ID is a virtual thread, is not alive, or does not exist, then this method will return `null`. A thread is alive if it has been started and has not yet terminated. MBeanServer access: The mapped type of `ThreadInfo` is `CompositeData` with attributes as specified in the `ThreadInfo.from` method. Annotations @Override

public ThreadInfo getThreadInfo(long id)

Implements java.lang.management.ThreadMXBean.getThreadInfo.

Doc from java.lang.management.ThreadMXBean.getThreadInfo.

Returns the thread info for a thread of the specified id with no stack trace. This method is equivalent to calling:

getThreadInfo(id, 0);

This method returns a ThreadInfo object representing the thread information for the thread of the specified ID. The stack trace, locked monitors, and locked synchronizers in the returned ThreadInfo object will be empty. If a thread of the given ID is a virtual thread, is not alive, or does not exist, then this method will return null. A thread is alive if it has been started and has not yet terminated.

MBeanServer access:
The mapped type of ThreadInfo is CompositeData with attributes as specified in the ThreadInfo.from method.

Annotations

@Override

getThreadInfo back to summary

getThreadInfo	back to summary
public ThreadInfo getThreadInfo(long id, int maxDepth) Implements java.lang.management.ThreadMXBean.getThreadInfo. Doc from java.lang.management.ThreadMXBean.getThreadInfo. Returns a thread info for a thread of the specified `id`, with stack trace of a specified number of stack trace elements. The `maxDepth` parameter indicates the maximum number of `StackTraceElement` to be retrieved from the stack trace. If `maxDepth == Integer.MAX_VALUE`, the entire stack trace of the thread will be dumped. If `maxDepth == 0`, no stack trace of the thread will be dumped. This method does not obtain the locked monitors and locked synchronizers of the thread. When the Java virtual machine has no stack trace information about a thread or `maxDepth == 0`, the stack trace in the `ThreadInfo` object will be an empty array of `StackTraceElement`. If a thread of the given ID is a virtual thread, is not alive, or does not exist, this method will return `null`. A thread is alive if it has been started and has not yet terminated. MBeanServer access: The mapped type of `ThreadInfo` is `CompositeData` with attributes as specified in the `ThreadInfo.from` method. Annotations @Override

public ThreadInfo getThreadInfo(long id, int maxDepth)

Implements java.lang.management.ThreadMXBean.getThreadInfo.

Doc from java.lang.management.ThreadMXBean.getThreadInfo.

Returns a thread info for a thread of the specified id, with stack trace of a specified number of stack trace elements. The maxDepth parameter indicates the maximum number of StackTraceElement to be retrieved from the stack trace. If maxDepth == Integer.MAX_VALUE, the entire stack trace of the thread will be dumped. If maxDepth == 0, no stack trace of the thread will be dumped. This method does not obtain the locked monitors and locked synchronizers of the thread.

When the Java virtual machine has no stack trace information about a thread or maxDepth == 0, the stack trace in the ThreadInfo object will be an empty array of StackTraceElement.

If a thread of the given ID is a virtual thread, is not alive, or does not exist, this method will return null. A thread is alive if it has been started and has not yet terminated.

MBeanServer access:
The mapped type of ThreadInfo is CompositeData with attributes as specified in the ThreadInfo.from method.

Annotations

@Override

getThreadInfo back to summary

getThreadInfo	back to summary
public ThreadInfo[] getThreadInfo(long[] ids) Implements java.lang.management.ThreadMXBean.getThreadInfo. Doc from java.lang.management.ThreadMXBean.getThreadInfo. Returns the thread info for each thread whose ID is in the input array `ids` with no stack trace. This method is equivalent to calling: `getThreadInfo`(ids, 0); This method returns an array of the `ThreadInfo` objects. The stack trace, locked monitors, and locked synchronizers in each `ThreadInfo` object will be empty. If a thread of the given ID is a virtual thread, is not alive, or does not exist, the corresponding element in the returned array will contain `null`. A thread is alive if it has been started and has not yet terminated. MBeanServer access: The mapped type of `ThreadInfo` is `CompositeData` with attributes as specified in the `ThreadInfo.from` method. Annotations @Override

public ThreadInfo[] getThreadInfo(long[] ids)

Implements java.lang.management.ThreadMXBean.getThreadInfo.

Doc from java.lang.management.ThreadMXBean.getThreadInfo.

Returns the thread info for each thread whose ID is in the input array ids with no stack trace. This method is equivalent to calling:

  getThreadInfo(ids, 0);

This method returns an array of the ThreadInfo objects. The stack trace, locked monitors, and locked synchronizers in each ThreadInfo object will be empty. If a thread of the given ID is a virtual thread, is not alive, or does not exist, the corresponding element in the returned array will contain null. A thread is alive if it has been started and has not yet terminated.

MBeanServer access:
The mapped type of ThreadInfo is CompositeData with attributes as specified in the ThreadInfo.from method.

Annotations

@Override

getThreadInfo back to summary

getThreadInfo	back to summary
public ThreadInfo[] getThreadInfo(long[] ids, int maxDepth) Implements java.lang.management.ThreadMXBean.getThreadInfo. Doc from java.lang.management.ThreadMXBean.getThreadInfo. Returns the thread info for each thread whose ID is in the input array `ids`, with stack trace of a specified number of stack trace elements. The `maxDepth` parameter indicates the maximum number of `StackTraceElement` to be retrieved from the stack trace. If `maxDepth == Integer.MAX_VALUE`, the entire stack trace of the thread will be dumped. If `maxDepth == 0`, no stack trace of the thread will be dumped. This method does not obtain the locked monitors and locked synchronizers of the threads. When the Java virtual machine has no stack trace information about a thread or `maxDepth == 0`, the stack trace in the `ThreadInfo` object will be an empty array of `StackTraceElement`. This method returns an array of the `ThreadInfo` objects, each is the thread information about the thread with the same index as in the `ids` array. If a thread of the given ID is a virtual thread, is not alive, or does not exist, `null` will be set in the corresponding element in the returned array. A thread is alive if it has been started and has not yet terminated. MBeanServer access: The mapped type of `ThreadInfo` is `CompositeData` with attributes as specified in the `ThreadInfo.from` method. Annotations @Override

public ThreadInfo[] getThreadInfo(long[] ids, int maxDepth)

Implements java.lang.management.ThreadMXBean.getThreadInfo.

Doc from java.lang.management.ThreadMXBean.getThreadInfo.

Returns the thread info for each thread whose ID is in the input array ids, with stack trace of a specified number of stack trace elements. The maxDepth parameter indicates the maximum number of StackTraceElement to be retrieved from the stack trace. If maxDepth == Integer.MAX_VALUE, the entire stack trace of the thread will be dumped. If maxDepth == 0, no stack trace of the thread will be dumped. This method does not obtain the locked monitors and locked synchronizers of the threads.

When the Java virtual machine has no stack trace information about a thread or maxDepth == 0, the stack trace in the ThreadInfo object will be an empty array of StackTraceElement.

This method returns an array of the ThreadInfo objects, each is the thread information about the thread with the same index as in the ids array. If a thread of the given ID is a virtual thread, is not alive, or does not exist, null will be set in the corresponding element in the returned array. A thread is alive if it has been started and has not yet terminated.

MBeanServer access:
The mapped type of ThreadInfo is CompositeData with attributes as specified in the ThreadInfo.from method.

Annotations

@Override

getThreadInfo back to summary

getThreadInfo	back to summary
public ThreadInfo[] getThreadInfo(long[] ids, boolean lockedMonitors, boolean lockedSynchronizers) Implements java.lang.management.ThreadMXBean.getThreadInfo. Doc from java.lang.management.ThreadMXBean.getThreadInfo. Returns the thread info for each thread whose ID is in the input array `ids`, with stack trace and synchronization information. This is equivalent to calling: `getThreadInfo(ids, lockedMonitors, lockedSynchronizers, Integer.MAX_VALUE)` Annotations @Override

public ThreadInfo[] getThreadInfo(long[] ids, boolean lockedMonitors, boolean lockedSynchronizers)

Implements java.lang.management.ThreadMXBean.getThreadInfo.

Doc from java.lang.management.ThreadMXBean.getThreadInfo.

Returns the thread info for each thread whose ID is in the input array ids, with stack trace and synchronization information. This is equivalent to calling:

getThreadInfo(ids, lockedMonitors, lockedSynchronizers, Integer.MAX_VALUE)

Annotations

@Override

getThreadInfo back to summary

getThreadInfo	back to summary
public ThreadInfo[] getThreadInfo(long[] ids, boolean lockedMonitors, boolean lockedSynchronizers, int maxDepth) Overrides default java.lang.management.ThreadMXBean.getThreadInfo. Doc from java.lang.management.ThreadMXBean.getThreadInfo. Returns the thread info for each thread whose ID is in the input array `ids`, with stack trace of the specified maximum number of elements and synchronization information. If `maxDepth == 0`, no stack trace of the thread will be dumped. This method obtains a snapshot of the thread information for each thread including: stack trace of the specified maximum number of elements, the object monitors currently locked by the thread if `lockedMonitors` is `true`, and the ownable synchronizers currently locked by the thread if `lockedSynchronizers` is `true`. This method returns an array of the `ThreadInfo` objects, each is the thread information about the thread with the same index as in the `ids` array. If a thread of the given ID is a virtual thread, is not alive, or does not exist, `null` will be set in the corresponding element in the returned array. A thread is alive if it has been started and has not yet terminated. If a thread does not lock any object monitor or `lockedMonitors` is `false`, the returned `ThreadInfo` object will have an empty `MonitorInfo` array. Similarly, if a thread does not lock any synchronizer or `lockedSynchronizers` is `false`, the returned `ThreadInfo` object will have an empty `LockInfo` array. When both `lockedMonitors` and `lockedSynchronizers` parameters are `false`, it is equivalent to calling: `getThreadInfo(ids, maxDepth)` This method is designed for troubleshooting use, but not for synchronization control. It might be an expensive operation. MBeanServer access: The mapped type of `ThreadInfo` is `CompositeData` with attributes as specified in the `ThreadInfo.from` method. Annotations @Override

public ThreadInfo[] getThreadInfo(long[] ids, boolean lockedMonitors, boolean lockedSynchronizers, int maxDepth)

Overrides default java.lang.management.ThreadMXBean.getThreadInfo.

Doc from java.lang.management.ThreadMXBean.getThreadInfo.

Returns the thread info for each thread whose ID is in the input array ids, with stack trace of the specified maximum number of elements and synchronization information. If maxDepth == 0, no stack trace of the thread will be dumped.

This method obtains a snapshot of the thread information for each thread including:

stack trace of the specified maximum number of elements,
the object monitors currently locked by the thread if lockedMonitors is true, and
the ownable synchronizers currently locked by the thread if lockedSynchronizers is true.

If a thread does not lock any object monitor or lockedMonitors is false, the returned ThreadInfo object will have an empty MonitorInfo array. Similarly, if a thread does not lock any synchronizer or lockedSynchronizers is false, the returned ThreadInfo object will have an empty LockInfo array.

When both lockedMonitors and lockedSynchronizers parameters are false, it is equivalent to calling:

    getThreadInfo(ids, maxDepth)

This method is designed for troubleshooting use, but not for synchronization control. It might be an expensive operation.

MBeanServer access:
The mapped type of ThreadInfo is CompositeData with attributes as specified in the ThreadInfo.from method.

Annotations

@Override

getThreadInfo1	back to summary
private static native void getThreadInfo1(long[] ids, int maxDepth, ThreadInfo[] result)

getThreads	back to summary
private static native Thread[] getThreads()

getThreadTotalCpuTime0	back to summary
private static native long getThreadTotalCpuTime0(long id)

getThreadTotalCpuTime1	back to summary
private static native void getThreadTotalCpuTime1(long[] ids, long[] result)

getThreadUserCpuTime0	back to summary
private static native long getThreadUserCpuTime0(long id)

getThreadUserCpuTime1	back to summary
private static native void getThreadUserCpuTime1(long[] ids, long[] result)

getThreadUserTime back to summary

getThreadUserTime	back to summary
public long getThreadUserTime(long id) Implements java.lang.management.ThreadMXBean.getThreadUserTime. Doc from java.lang.management.ThreadMXBean.getThreadUserTime. Returns the CPU time that a thread of the specified ID has executed in user mode in nanoseconds. The returned value is of nanoseconds precision but not necessarily nanoseconds accuracy. If the thread of the specified ID is a virtual thread, is not alive, or does not exist, this method returns `-1`. If CPU time measurement is disabled, this method returns `-1`. A thread is alive if it has been started and has not yet terminated. If CPU time measurement is enabled after the thread has started, the Java virtual machine implementation may choose any time up to and including the time that the capability is enabled as the point where CPU time measurement starts. Annotations @Override

public long getThreadUserTime(long id)

Implements java.lang.management.ThreadMXBean.getThreadUserTime.

Doc from java.lang.management.ThreadMXBean.getThreadUserTime.

Returns the CPU time that a thread of the specified ID has executed in user mode in nanoseconds. The returned value is of nanoseconds precision but not necessarily nanoseconds accuracy.

If the thread of the specified ID is a virtual thread, is not alive, or does not exist, this method returns -1. If CPU time measurement is disabled, this method returns -1. A thread is alive if it has been started and has not yet terminated.

Annotations

@Override

getThreadUserTime	back to summary
protected long[] getThreadUserTime(long[] ids)

getTotalStartedThreadCount	back to summary
public long getTotalStartedThreadCount() Implements java.lang.management.ThreadMXBean.getTotalStartedThreadCount. Doc from java.lang.management.ThreadMXBean.getTotalStartedThreadCount. Returns the total number of platform threads created and also started since the Java virtual machine started. The count does not include virtual threads. Annotations @Override

getTotalStartedThreadCount

back to summary

public long getTotalStartedThreadCount()

Implements java.lang.management.ThreadMXBean.getTotalStartedThreadCount.

Doc from java.lang.management.ThreadMXBean.getTotalStartedThreadCount.

Returns the total number of platform threads created and also started since the Java virtual machine started. The count does not include virtual threads.

Annotations

@Override

getTotalThreadAllocatedBytes	back to summary
protected long getTotalThreadAllocatedBytes()

getTotalThreadAllocatedMemory	back to summary
private static native long getTotalThreadAllocatedMemory()

isCurrentThreadCpuTimeSupported back to summary

isCurrentThreadCpuTimeSupported	back to summary
public boolean isCurrentThreadCpuTimeSupported() Implements java.lang.management.ThreadMXBean.isCurrentThreadCpuTimeSupported. Doc from java.lang.management.ThreadMXBean.isCurrentThreadCpuTimeSupported. Tests if the Java virtual machine supports CPU time measurement from a platform thread with the `getCurrentThreadCpuTime()` and `getCurrentThreadUserTime()` methods. This method returns `true` if `isThreadCpuTimeSupported` returns `true`. Annotations @Override

public boolean isCurrentThreadCpuTimeSupported()

Implements java.lang.management.ThreadMXBean.isCurrentThreadCpuTimeSupported.

Doc from java.lang.management.ThreadMXBean.isCurrentThreadCpuTimeSupported.

Tests if the Java virtual machine supports CPU time measurement from a platform thread with the getCurrentThreadCpuTime() and getCurrentThreadUserTime() methods. This method returns true if isThreadCpuTimeSupported returns true.

Annotations

@Override

isObjectMonitorUsageSupported	back to summary
public boolean isObjectMonitorUsageSupported() Implements java.lang.management.ThreadMXBean.isObjectMonitorUsageSupported. Doc from java.lang.management.ThreadMXBean.isObjectMonitorUsageSupported. Tests if the Java virtual machine supports monitoring of object monitor usage. Annotations @Override

isObjectMonitorUsageSupported

back to summary

public boolean isObjectMonitorUsageSupported()

Implements java.lang.management.ThreadMXBean.isObjectMonitorUsageSupported.

Doc from java.lang.management.ThreadMXBean.isObjectMonitorUsageSupported.

Tests if the Java virtual machine supports monitoring of object monitor usage.

Annotations

@Override

isSynchronizerUsageSupported	back to summary
public boolean isSynchronizerUsageSupported() Implements java.lang.management.ThreadMXBean.isSynchronizerUsageSupported. Doc from java.lang.management.ThreadMXBean.isSynchronizerUsageSupported. Tests if the Java virtual machine supports monitoring of ownable synchronizer usage. Annotations @Override

isSynchronizerUsageSupported

back to summary

public boolean isSynchronizerUsageSupported()

Implements java.lang.management.ThreadMXBean.isSynchronizerUsageSupported.

Doc from java.lang.management.ThreadMXBean.isSynchronizerUsageSupported.

Tests if the Java virtual machine supports monitoring of ownable synchronizer usage.

Annotations

@Override

isThreadAllocatedMemoryEnabled	back to summary
protected boolean isThreadAllocatedMemoryEnabled()

isThreadAllocatedMemorySupported	back to summary
protected boolean isThreadAllocatedMemorySupported()

isThreadContentionMonitoringEnabled

back to summary

public synchronized boolean isThreadContentionMonitoringEnabled()

Implements java.lang.management.ThreadMXBean.isThreadContentionMonitoringEnabled.

Doc from java.lang.management.ThreadMXBean.isThreadContentionMonitoringEnabled.

Tests if thread contention monitoring is enabled.

Annotations

@Override

isThreadContentionMonitoringSupported

back to summary

public boolean isThreadContentionMonitoringSupported()

Implements java.lang.management.ThreadMXBean.isThreadContentionMonitoringSupported.

Doc from java.lang.management.ThreadMXBean.isThreadContentionMonitoringSupported.

Tests if the Java virtual machine supports thread contention monitoring.

Annotations

@Override

isThreadCpuTimeEnabled

back to summary

public boolean isThreadCpuTimeEnabled()

Implements java.lang.management.ThreadMXBean.isThreadCpuTimeEnabled.

Doc from java.lang.management.ThreadMXBean.isThreadCpuTimeEnabled.

Tests if thread CPU time measurement is enabled.

Annotations

@Override

isThreadCpuTimeSupported

back to summary

public boolean isThreadCpuTimeSupported()

Implements java.lang.management.ThreadMXBean.isThreadCpuTimeSupported.

Doc from java.lang.management.ThreadMXBean.isThreadCpuTimeSupported.

Tests if the Java virtual machine implementation supports CPU time measurement for any platform thread. A Java virtual machine implementation that supports CPU time measurement for any platform thread will also support CPU time measurement for the current thread, when the current thread is a platform thread.

Annotations

@Override

resetContentionTimes0	back to summary
private static native void resetContentionTimes0(long tid)

resetPeakThreadCount

back to summary

public void resetPeakThreadCount()

Implements java.lang.management.ThreadMXBean.resetPeakThreadCount.

Doc from java.lang.management.ThreadMXBean.resetPeakThreadCount.

Resets the peak thread count to the current number of live platform threads.

Annotations

@Override

resetPeakThreadCount0	back to summary
private static native void resetPeakThreadCount0()

setThreadAllocatedMemoryEnabled	back to summary
protected void setThreadAllocatedMemoryEnabled(boolean enable)

setThreadAllocatedMemoryEnabled0	back to summary
private static native void setThreadAllocatedMemoryEnabled0(boolean enable)

setThreadContentionMonitoringEnabled

back to summary

public void setThreadContentionMonitoringEnabled(boolean enable)

Implements java.lang.management.ThreadMXBean.setThreadContentionMonitoringEnabled.

Doc from java.lang.management.ThreadMXBean.setThreadContentionMonitoringEnabled.

Enables or disables thread contention monitoring. Thread contention monitoring is disabled by default.

Annotations

@Override

setThreadContentionMonitoringEnabled0	back to summary
private static native void setThreadContentionMonitoringEnabled0(boolean enable)

setThreadCpuTimeEnabled

back to summary

public void setThreadCpuTimeEnabled(boolean enable)

Implements java.lang.management.ThreadMXBean.setThreadCpuTimeEnabled.

Doc from java.lang.management.ThreadMXBean.setThreadCpuTimeEnabled.

Enables or disables thread CPU time measurement. The default is platform dependent.

Annotations

@Override

setThreadCpuTimeEnabled0	back to summary
private static native void setThreadCpuTimeEnabled0(boolean enable)

threadIds	back to summary
private static long[] threadIds(Thread[] threads) Returns the thread identifiers of the threads in the given array.

threadsToIds	back to summary
private long[] threadsToIds(Thread[] threads) Returns an array of thread identifiers for the threads in the given array. Returns `null` if `threads` is null or the array of threads is empty.

verifyCurrentThreadCpuTime	back to summary
private boolean verifyCurrentThreadCpuTime()

verifyDumpThreads	back to summary
private void verifyDumpThreads(boolean lockedMonitors, boolean lockedSynchronizers)

verifyThreadAllocatedMemory	back to summary
private boolean verifyThreadAllocatedMemory(long id)

verifyThreadAllocatedMemory	back to summary
private boolean verifyThreadAllocatedMemory(long[] ids)

verifyThreadCpuTime	back to summary
private boolean verifyThreadCpuTime(long[] ids)

verifyThreadId	back to summary
private void verifyThreadId(long id)

verifyThreadIds	back to summary
private void verifyThreadIds(long[] ids)

public Class ThreadImpl

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