OpenJDK 27 · java.lang.management.ThreadInfo · APIdia, the JavaDoc alternative

Modifier and Type	Field and Description
private long	blockedCount
private long	blockedTime
private boolean	daemon
private static MonitorInfo[]	EMPTY_MONITORS
private static LockInfo[]	EMPTY_SYNCS
private boolean	inNative
private LockInfo	lock
private MonitorInfo[]	lockedMonitors
private LockInfo[]	lockedSynchronizers
private String	lockName
private long	lockOwnerId
private String	lockOwnerName
private static final int	MAX_FRAMES
private static final StackTraceElement[]	NO_STACK_TRACE
private int	priority
private StackTraceElement[]	stackTrace
private boolean	suspended
private long	threadId
private String	threadName
private Thread.State	threadState
private long	waitedCount
private long	waitedTime

Access	Constructor and Description
private	ThreadInfo(Thread Thread t, int Thread state state, Object Object on which the thread is blocked lockObj, Thread the thread holding the lock lockOwner, long Number of times blocked to enter a lock blockedCount, long Approx time blocked to enter a lock blockedTime, long Number of times waited on a lock waitedCount, long Approx time waited on a lock waitedTime, StackTraceElement[] Thread stack trace stackTrace) Constructor of ThreadInfo created by the JVM
private	ThreadInfo(Thread Thread t, int Thread state state, Object Object on which the thread is blocked lockObj, Thread the thread holding the lock lockOwner, long Number of times blocked to enter a lock blockedCount, long Approx time blocked to enter a lock blockedTime, long Number of times waited on a lock waitedCount, long Approx time waited on a lock waitedTime, StackTraceElement[] Thread stack trace stackTrace, Object[] List of locked monitors monitors, int[] List of stack depths stackDepths, Object[] List of locked synchronizers synchronizers) Constructor of ThreadInfo created by the JVM for `ThreadMXBean#getThreadInfo(long[], boolean, boolean)` and `ThreadMXBean#dumpAllThreads`
private	ThreadInfo(CompositeData cd)

Method Summary

Modifier and Type	Method and Description
public static ThreadInfo	Returns: a `ThreadInfo` object represented by `cd` if `cd` is not `null`; `null` otherwise. from(CompositeData `CompositeData` representing a `ThreadInfo` cd) Returns a `ThreadInfo` object represented by the given `CompositeData`.
public long	Returns: the total number of times that the thread entered the `BLOCKED` state. getBlockedCount() Returns the total number of times that the thread associated with this `ThreadInfo` blocked to enter or reenter a monitor.
public long	Returns: the approximate accumulated elapsed time in milliseconds that a thread entered the `BLOCKED` state; `-1` if thread contention monitoring is disabled. getBlockedTime() Returns the approximate accumulated elapsed time (in milliseconds) that the thread associated with this `ThreadInfo` has blocked to enter or reenter a monitor since thread contention monitoring is enabled.
public MonitorInfo[]	Returns: an array of `MonitorInfo` objects representing the object monitors locked by the thread. getLockedMonitors() Returns an array of `MonitorInfo` objects, each of which represents an object monitor currently locked by the thread associated with this `ThreadInfo`.
public LockInfo[]	Returns: an array of `LockInfo` objects representing the ownable synchronizers locked by the thread. getLockedSynchronizers() Returns an array of `LockInfo` objects, each of which represents an ownable synchronizer currently locked by the thread associated with this `ThreadInfo`.
public LockInfo	Returns: `LockInfo` of an object for which the thread is blocked waiting if any; `null` otherwise. getLockInfo() Returns the `LockInfo` of an object for which the thread associated with this `ThreadInfo` is blocked waiting.
public String	Returns: the string representation of the object on which the thread is blocked if any; `null` otherwise. getLockName() Returns the `string representation` of an object for which the thread associated with this `ThreadInfo` is blocked waiting.
public long	Returns: the thread ID of the owner thread of the object this thread is blocked on; `-1` if this thread is not blocked or if the object is not owned by any thread. getLockOwnerId() Returns the ID of the thread which owns the object for which the thread associated with this `ThreadInfo` is blocked waiting.
public String	Returns: the name of the thread that owns the object this thread is blocked on; `null` if this thread is not blocked or if the object is not owned by any thread. getLockOwnerName() Returns the name of the thread which owns the object for which the thread associated with this `ThreadInfo` is blocked waiting.
public int	Returns: The priority of the thread associated with this `ThreadInfo`. getPriority() Returns the thread priority of the thread associated with this `ThreadInfo`.
public StackTraceElement[]	Returns: an array of `StackTraceElement` objects of the thread. getStackTrace() Returns the stack trace of the thread associated with this `ThreadInfo`.
public long	Returns: the ID of the associated thread. getThreadId() Returns the ID of the thread associated with this `ThreadInfo`.
public String	Returns: the name of the associated thread. getThreadName() Returns the name of the thread associated with this `ThreadInfo`.
public Thread.State	Returns: `Thread.State` of the associated thread. getThreadState() Returns the state of the thread associated with this `ThreadInfo`.
public long	Returns: the total number of times that the thread was in the `WAITING` or `TIMED_WAITING` state. getWaitedCount() Returns the total number of times that the thread associated with this `ThreadInfo` waited for notification.
public long	Returns: the approximate accumulated elapsed time in milliseconds that a thread has been in the `WAITING` or `TIMED_WAITING` state; `-1` if thread contention monitoring is disabled. getWaitedTime() Returns the approximate accumulated elapsed time (in milliseconds) that the thread associated with this `ThreadInfo` has waited for notification since thread contention monitoring is enabled.
private void	initialize(Thread Thread t, int Thread state state, Object Object on which the thread is blocked lockObj, Thread the thread holding the lock lockOwner, long Number of times blocked to enter a lock blockedCount, long Approx time blocked to enter a lock blockedTime, long Number of times waited on a lock waitedCount, long Approx time waited on a lock waitedTime, StackTraceElement[] Thread stack trace stackTrace, MonitorInfo[] List of locked monitors lockedMonitors, LockInfo[] List of locked synchronizers lockedSynchronizers) Initialize ThreadInfo object
public boolean	Returns: `true` if the thread is a daemon thread, `false` otherwise. isDaemon() Tests if the thread associated with this `ThreadInfo` is a daemon thread.
public boolean	Returns: `true` if the thread is executing native code; `false` otherwise. isInNative() Tests if the thread associated with this `ThreadInfo` is executing native code.
public boolean	Returns: `true` if the thread is suspended; `false` otherwise. isSuspended() Tests if the thread associated with this `ThreadInfo` is suspended.
public String	Returns: a string representation of this thread info. toString() Overrides java.lang.Object.toString. Returns a string representation of this thread info.

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

blockedCount	back to summary
private long blockedCount

blockedTime	back to summary
private long blockedTime

daemon	back to summary
private boolean daemon

EMPTY_MONITORS	back to summary
private static MonitorInfo[] EMPTY_MONITORS

EMPTY_SYNCS	back to summary
private static LockInfo[] EMPTY_SYNCS

inNative	back to summary
private boolean inNative

lock	back to summary
private LockInfo lock

lockedMonitors	back to summary
private MonitorInfo[] lockedMonitors

lockedSynchronizers	back to summary
private LockInfo[] lockedSynchronizers

lockName	back to summary
private String lockName

lockOwnerId	back to summary
private long lockOwnerId

lockOwnerName	back to summary
private String lockOwnerName

MAX_FRAMES	back to summary
private static final int MAX_FRAMES

NO_STACK_TRACE	back to summary
private static final StackTraceElement[] NO_STACK_TRACE

priority	back to summary
private int priority

stackTrace	back to summary
private StackTraceElement[] stackTrace

suspended	back to summary
private boolean suspended

threadId	back to summary
private long threadId

threadName	back to summary
private String threadName

threadState	back to summary
private Thread.State threadState

waitedCount	back to summary
private long waitedCount

waitedTime	back to summary
private long waitedTime

ThreadInfo	back to summary
private ThreadInfo(Thread t, int state, Object lockObj, Thread lockOwner, long blockedCount, long blockedTime, long waitedCount, long waitedTime, StackTraceElement[] stackTrace) Constructor of ThreadInfo created by the JVM Parameters t:Thread Thread state:int Thread state lockObj:Object Object on which the thread is blocked lockOwner:Thread the thread holding the lock blockedCount:long Number of times blocked to enter a lock blockedTime:long Approx time blocked to enter a lock waitedCount:long Number of times waited on a lock waitedTime:long Approx time waited on a lock stackTrace:StackTraceElement[] Thread stack trace

ThreadInfo	back to summary
private ThreadInfo(Thread t, int state, Object lockObj, Thread lockOwner, long blockedCount, long blockedTime, long waitedCount, long waitedTime, StackTraceElement[] stackTrace, Object[] monitors, int[] stackDepths, Object[] synchronizers) Constructor of ThreadInfo created by the JVM for `ThreadMXBean#getThreadInfo(long[], boolean, boolean)` and `ThreadMXBean#dumpAllThreads` Parameters t:Thread Thread state:int Thread state lockObj:Object Object on which the thread is blocked lockOwner:Thread the thread holding the lock blockedCount:long Number of times blocked to enter a lock blockedTime:long Approx time blocked to enter a lock waitedCount:long Number of times waited on a lock waitedTime:long Approx time waited on a lock stackTrace:StackTraceElement[] Thread stack trace monitors:Object[] List of locked monitors stackDepths:int[] List of stack depths synchronizers:Object[] List of locked synchronizers

ThreadInfo	back to summary
private ThreadInfo(CompositeData cd)

Method Detail

from back to summary

public static ThreadInfo from(CompositeData cd)

Returns a ThreadInfo object represented by the given CompositeData. A CompositeData representing a ThreadInfo of version N must contain all of the attributes defined in version ≤ N unless specified otherwise. The same rule applies the composite type of the given CompositeData and transitively to attributes whose type or component type is CompositeType.

A CompositeData representing ThreadInfo of version N contains "stackTrace" attribute and "lockedMonitors" attribute representing an array of StackTraceElement and an array of MonitorInfo respectively and their types are of version N. The "lockedStackFrame" attribute in MonitorInfo's composite type must represent StackTraceElement of the same version N. Otherwise, this method will throw IllegalArgumentException.

The attributes and their types for ThreadInfo's composite data
Attribute Name	Type	Since
threadId	`java.lang.Long`	5
threadName	`java.lang.String`	5
threadState	`java.lang.String`	5
suspended	`java.lang.Boolean`	5
inNative	`java.lang.Boolean`	5
blockedCount	`java.lang.Long`	5
blockedTime	`java.lang.Long`	5
waitedCount	`java.lang.Long`	5
waitedTime	`java.lang.Long`	5
lockName	`java.lang.String`	5
lockOwnerId	`java.lang.Long`	5
lockOwnerName	`java.lang.String`	5
stackTrace	`javax.management.openmbean.CompositeData[]`, each element is a `CompositeData` representing `StackTraceElement` as specified below.	5
lockInfo	`javax.management.openmbean.CompositeData` - the mapped type for `LockInfo` as specified in the `LockInfo#from` method. If the given `CompositeData` does not contain this attribute, the `LockInfo` object will be constructed from the value of the `lockName` attribute.	6
lockedMonitors	`javax.management.openmbean.CompositeData[]` whose element type is the mapped type for `MonitorInfo` as specified in the `MonitorInfo.from` method. If the given `CompositeData` does not contain this attribute, this attribute will be set to an empty array.	6
lockedSynchronizers	`javax.management.openmbean.CompositeData[]` whose element type is the mapped type for `LockInfo` as specified in the `LockInfo#from` method. If the given `CompositeData` does not contain this attribute, this attribute will be set to an empty array.	6
daemon	`java.lang.Boolean` If the given `CompositeData` does not contain this attribute, this attribute will be set to `false`.	9
priority	`java.lang.Integer` If the given `CompositeData` does not contain this attribute, This attribute will be set to `Thread#NORM_PRIORITY`.	9

A CompositeData representing StackTraceElement of version N must contain all of the attributes defined in version ≤ N unless specified otherwise.

The attributes and their types for StackTraceElement's composite data
Attribute Name	Type	Since
classLoaderName	`java.lang.String`	9
moduleName	`java.lang.String`	9
moduleVersion	`java.lang.String`	9
className	`java.lang.String`	5
methodName	`java.lang.String`	5
fileName	`java.lang.String`	5
lineNumber	`java.lang.Integer`	5
nativeMethod	`java.lang.Boolean`	5

Parameters

cd:CompositeData: CompositeData representing a ThreadInfo

Returns:ThreadInfo

a ThreadInfo object represented by cd if cd is not null; null otherwise.

Exceptions

IllegalArgumentException:: if the given cd and its composite type does not contain all of the attributes defined for a ThreadInfo of a specific runtime version.

getBlockedCount back to summary

getBlockedCount	back to summary
public long getBlockedCount() Returns the total number of times that the thread associated with this `ThreadInfo` blocked to enter or reenter a monitor. I.e. the number of times a thread has been in the `BLOCKED` state. Returns:long the total number of times that the thread entered the `BLOCKED` state.

public long getBlockedCount()

Returns the total number of times that the thread associated with this ThreadInfo blocked to enter or reenter a monitor. I.e. the number of times a thread has been in the BLOCKED state.

Returns:long: the total number of times that the thread entered the BLOCKED state.

getBlockedTime back to summary

getBlockedTime	back to summary
public long getBlockedTime() Returns the approximate accumulated elapsed time (in milliseconds) that the thread associated with this `ThreadInfo` has blocked to enter or reenter a monitor since thread contention monitoring is enabled. I.e. the total accumulated time the thread has been in the `BLOCKED` state since thread contention monitoring was last enabled. This method returns `-1` if thread contention monitoring is disabled. The Java virtual machine may measure the time with a high resolution timer. This statistic is reset when the thread contention monitoring is re-enabled. Returns:long the approximate accumulated elapsed time in milliseconds that a thread entered the `BLOCKED` state; `-1` if thread contention monitoring is disabled. Exceptions UnsupportedOperationException: if the Java virtual machine does not support this operation. See Also `ThreadMXBean#isThreadContentionMonitoringSupported`, `ThreadMXBean#setThreadContentionMonitoringEnabled`

public long getBlockedTime()

Returns the approximate accumulated elapsed time (in milliseconds) that the thread associated with this ThreadInfo has blocked to enter or reenter a monitor since thread contention monitoring is enabled. I.e. the total accumulated time the thread has been in the BLOCKED state since thread contention monitoring was last enabled. This method returns -1 if thread contention monitoring is disabled.

The Java virtual machine may measure the time with a high resolution timer. This statistic is reset when the thread contention monitoring is re-enabled.

Returns:long

the approximate accumulated elapsed time in milliseconds that a thread entered the BLOCKED state; -1 if thread contention monitoring is disabled.

Exceptions

UnsupportedOperationException:: if the Java virtual machine does not support this operation.

getLockedMonitors back to summary

getLockedMonitors	back to summary
public MonitorInfo[] getLockedMonitors() Returns an array of `MonitorInfo` objects, each of which represents an object monitor currently locked by the thread associated with this `ThreadInfo`. If no locked monitor was requested for this thread info or no monitor is locked by the thread, this method will return a zero-length array. Returns:MonitorInfo[] an array of `MonitorInfo` objects representing the object monitors locked by the thread. Since 1.6

public MonitorInfo[] getLockedMonitors()

Returns an array of MonitorInfo objects, each of which represents an object monitor currently locked by the thread associated with this ThreadInfo. If no locked monitor was requested for this thread info or no monitor is locked by the thread, this method will return a zero-length array.

Returns:MonitorInfo[]: an array of MonitorInfo objects representing the object monitors locked by the thread.
Since: 1.6

getLockedSynchronizers back to summary

getLockedSynchronizers	back to summary
public LockInfo[] getLockedSynchronizers() Returns an array of `LockInfo` objects, each of which represents an ownable synchronizer currently locked by the thread associated with this `ThreadInfo`. If no locked synchronizer was requested for this thread info or no synchronizer is locked by the thread, this method will return a zero-length array. Returns:LockInfo[] an array of `LockInfo` objects representing the ownable synchronizers locked by the thread. Since 1.6

public LockInfo[] getLockedSynchronizers()

Returns an array of LockInfo objects, each of which represents an ownable synchronizer currently locked by the thread associated with this ThreadInfo. If no locked synchronizer was requested for this thread info or no synchronizer is locked by the thread, this method will return a zero-length array.

Returns:LockInfo[]: an array of LockInfo objects representing the ownable synchronizers locked by the thread.
Since: 1.6

getLockInfo back to summary

getLockInfo	back to summary
public LockInfo getLockInfo() Returns the `LockInfo` of an object for which the thread associated with this `ThreadInfo` is blocked waiting. A thread can be blocked waiting for one of the following: an object monitor to be acquired for entering or reentering a synchronization block/method. The thread is in the `BLOCKED` state waiting to enter the `synchronized` statement or method. an object monitor to be notified by another thread. The thread is in the `WAITING` or `TIMED_WAITING` state due to a call to the `Object.wait` method. a synchronization object responsible for the thread parking. The thread is in the `WAITING` or `TIMED_WAITING` state due to a call to the `LockSupport.park` method. The synchronization object is the object returned from `LockSupport.getBlocker` method. Typically it is an ownable synchronizer or a `Condition`. This method returns `null` if the thread is not in any of the above conditions. Returns:LockInfo `LockInfo` of an object for which the thread is blocked waiting if any; `null` otherwise. Since 1.6

public LockInfo getLockInfo()

Returns the LockInfo of an object for which the thread associated with this ThreadInfo is blocked waiting. A thread can be blocked waiting for one of the following:

an object monitor to be acquired for entering or reentering a synchronization block/method.
The thread is in the BLOCKED state waiting to enter the synchronized statement or method.
an object monitor to be notified by another thread.
The thread is in the WAITING or TIMED_WAITING state due to a call to the Object.wait method.
a synchronization object responsible for the thread parking.
The thread is in the WAITING or TIMED_WAITING state due to a call to the LockSupport.park method. The synchronization object is the object returned from LockSupport.getBlocker method. Typically it is an ownable synchronizer or a Condition.

This method returns null if the thread is not in any of the above conditions.

Returns:LockInfo: LockInfo of an object for which the thread is blocked waiting if any; null otherwise.
Since: 1.6

getLockName back to summary

getLockName	back to summary
public String getLockName() Returns the `string representation` of an object for which the thread associated with this `ThreadInfo` is blocked waiting. This method is equivalent to calling: getLockInfo().toString() This method will return `null` if this thread is not blocked waiting for any object or if the object is not owned by any thread. Returns:String the string representation of the object on which the thread is blocked if any; `null` otherwise. See Also `getLockInfo`

public String getLockName()

Returns the string representation of an object for which the thread associated with this ThreadInfo is blocked waiting. This method is equivalent to calling:

getLockInfo().toString()

This method will return null if this thread is not blocked waiting for any object or if the object is not owned by any thread.

Returns:String: the string representation of the object on which the thread is blocked if any; null otherwise.
See Also: getLockInfo

getLockOwnerId back to summary

getLockOwnerId	back to summary
public long getLockOwnerId() Returns the ID of the thread which owns the object for which the thread associated with this `ThreadInfo` is blocked waiting. This method will return `-1` if this thread is not blocked waiting for any object or if the object is not owned by any thread. Returns:long the thread ID of the owner thread of the object this thread is blocked on; `-1` if this thread is not blocked or if the object is not owned by any thread. See Also `getLockInfo`

public long getLockOwnerId()

Returns the ID of the thread which owns the object for which the thread associated with this ThreadInfo is blocked waiting. This method will return -1 if this thread is not blocked waiting for any object or if the object is not owned by any thread.

Returns:long: the thread ID of the owner thread of the object this thread is blocked on; -1 if this thread is not blocked or if the object is not owned by any thread.
See Also: getLockInfo

getLockOwnerName back to summary

getLockOwnerName	back to summary
public String getLockOwnerName() Returns the name of the thread which owns the object for which the thread associated with this `ThreadInfo` is blocked waiting. This method will return `null` if this thread is not blocked waiting for any object or if the object is not owned by any thread. Returns:String the name of the thread that owns the object this thread is blocked on; `null` if this thread is not blocked or if the object is not owned by any thread. See Also `getLockInfo`

public String getLockOwnerName()

Returns the name of the thread which owns the object for which the thread associated with this ThreadInfo is blocked waiting. This method will return null if this thread is not blocked waiting for any object or if the object is not owned by any thread.

Returns:String: the name of the thread that owns the object this thread is blocked on; null if this thread is not blocked or if the object is not owned by any thread.
See Also: getLockInfo

getPriority back to summary

getPriority	back to summary
public int getPriority() Returns the thread priority of the thread associated with this `ThreadInfo`. Returns:int The priority of the thread associated with this `ThreadInfo`. Since 9

public int getPriority()

Returns the thread priority of the thread associated with this ThreadInfo.

Returns:int: The priority of the thread associated with this ThreadInfo.
Since: 9

getStackTrace back to summary

getStackTrace	back to summary
public StackTraceElement[] getStackTrace() Returns the stack trace of the thread associated with this `ThreadInfo`. If no stack trace was requested for this thread info, this method will return a zero-length array. If the returned array is of non-zero length then the first element of the array represents the top of the stack, which is the most recent method invocation in the sequence. The last element of the array represents the bottom of the stack, which is the least recent method invocation in the sequence. Some Java virtual machines may, under some circumstances, omit one or more stack frames from the stack trace. In the extreme case, a virtual machine that has no stack trace information concerning the thread associated with this `ThreadInfo` is permitted to return a zero-length array from this method. Returns:StackTraceElement[] an array of `StackTraceElement` objects of the thread.

public StackTraceElement[] getStackTrace()

Returns the stack trace of the thread associated with this ThreadInfo. If no stack trace was requested for this thread info, this method will return a zero-length array. If the returned array is of non-zero length then the first element of the array represents the top of the stack, which is the most recent method invocation in the sequence. The last element of the array represents the bottom of the stack, which is the least recent method invocation in the sequence.

Some Java virtual machines may, under some circumstances, omit one or more stack frames from the stack trace. In the extreme case, a virtual machine that has no stack trace information concerning the thread associated with this ThreadInfo is permitted to return a zero-length array from this method.

Returns:StackTraceElement[]: an array of StackTraceElement objects of the thread.

getThreadId back to summary

getThreadId	back to summary
public long getThreadId() Returns the ID of the thread associated with this `ThreadInfo`. Returns:long the ID of the associated thread.

public long getThreadId()

Returns the ID of the thread associated with this ThreadInfo.

Returns:long: the ID of the associated thread.

getThreadName back to summary

getThreadName	back to summary
public String getThreadName() Returns the name of the thread associated with this `ThreadInfo`. Returns:String the name of the associated thread.

public String getThreadName()

Returns the name of the thread associated with this ThreadInfo.

Returns:String: the name of the associated thread.

getThreadState back to summary

getThreadState	back to summary
public Thread.State getThreadState() Returns the state of the thread associated with this `ThreadInfo`. Returns:Thread.State `Thread.State` of the associated thread.

public Thread.State getThreadState()

Returns the state of the thread associated with this ThreadInfo.

Returns:Thread.State: Thread.State of the associated thread.

getWaitedCount back to summary

getWaitedCount	back to summary
public long getWaitedCount() Returns the total number of times that the thread associated with this `ThreadInfo` waited for notification. I.e. the number of times that a thread has been in the `WAITING` or `TIMED_WAITING` state. Returns:long the total number of times that the thread was in the `WAITING` or `TIMED_WAITING` state.

public long getWaitedCount()

Returns the total number of times that the thread associated with this ThreadInfo waited for notification. I.e. the number of times that a thread has been in the WAITING or TIMED_WAITING state.

Returns:long: the total number of times that the thread was in the WAITING or TIMED_WAITING state.

getWaitedTime back to summary

getWaitedTime	back to summary
public long getWaitedTime() Returns the approximate accumulated elapsed time (in milliseconds) that the thread associated with this `ThreadInfo` has waited for notification since thread contention monitoring is enabled. I.e. the total accumulated time the thread has been in the `WAITING` or `TIMED_WAITING` state since thread contention monitoring is enabled. This method returns `-1` if thread contention monitoring is disabled. The Java virtual machine may measure the time with a high resolution timer. This statistic is reset when the thread contention monitoring is re-enabled. Returns:long the approximate accumulated elapsed time in milliseconds that a thread has been in the `WAITING` or `TIMED_WAITING` state; `-1` if thread contention monitoring is disabled. Exceptions UnsupportedOperationException: if the Java virtual machine does not support this operation. See Also `ThreadMXBean#isThreadContentionMonitoringSupported`, `ThreadMXBean#setThreadContentionMonitoringEnabled`

public long getWaitedTime()

Returns the approximate accumulated elapsed time (in milliseconds) that the thread associated with this ThreadInfo has waited for notification since thread contention monitoring is enabled. I.e. the total accumulated time the thread has been in the WAITING or TIMED_WAITING state since thread contention monitoring is enabled. This method returns -1 if thread contention monitoring is disabled.

The Java virtual machine may measure the time with a high resolution timer. This statistic is reset when the thread contention monitoring is re-enabled.

Returns:long

the approximate accumulated elapsed time in milliseconds that a thread has been in the WAITING or TIMED_WAITING state; -1 if thread contention monitoring is disabled.

Exceptions

UnsupportedOperationException:: if the Java virtual machine does not support this operation.

initialize	back to summary
private void initialize(Thread t, int state, Object lockObj, Thread lockOwner, long blockedCount, long blockedTime, long waitedCount, long waitedTime, StackTraceElement[] stackTrace, MonitorInfo[] lockedMonitors, LockInfo[] lockedSynchronizers) Initialize ThreadInfo object Parameters t:Thread Thread state:int Thread state lockObj:Object Object on which the thread is blocked lockOwner:Thread the thread holding the lock blockedCount:long Number of times blocked to enter a lock blockedTime:long Approx time blocked to enter a lock waitedCount:long Number of times waited on a lock waitedTime:long Approx time waited on a lock stackTrace:StackTraceElement[] Thread stack trace lockedMonitors:MonitorInfo[] List of locked monitors lockedSynchronizers:LockInfo[] List of locked synchronizers

initialize

back to summary

private void initialize(Thread t, int state, Object lockObj, Thread lockOwner, long blockedCount, long blockedTime, long waitedCount, long waitedTime, StackTraceElement[] stackTrace, MonitorInfo[] lockedMonitors, LockInfo[] lockedSynchronizers)

Initialize ThreadInfo object

Parameters

t:Thread: Thread
state:int: Thread state
lockObj:Object: Object on which the thread is blocked
lockOwner:Thread: the thread holding the lock
blockedCount:long: Number of times blocked to enter a lock
blockedTime:long: Approx time blocked to enter a lock
waitedCount:long: Number of times waited on a lock
waitedTime:long: Approx time waited on a lock
stackTrace:StackTraceElement[]: Thread stack trace
lockedMonitors:MonitorInfo[]: List of locked monitors
lockedSynchronizers:LockInfo[]: List of locked synchronizers

isDaemon back to summary

isDaemon	back to summary
public boolean isDaemon() Tests if the thread associated with this `ThreadInfo` is a daemon thread. Returns:boolean `true` if the thread is a daemon thread, `false` otherwise. Since 9 See Also `Thread#isDaemon`

public boolean isDaemon()

Tests if the thread associated with this ThreadInfo is a daemon thread.

Returns:boolean: true if the thread is a daemon thread, false otherwise.
Since: 9
See Also: Thread#isDaemon

isInNative back to summary

isInNative	back to summary
public boolean isInNative() Tests if the thread associated with this `ThreadInfo` is executing native code. A thread is considered to be executing native code when it is executing a native method, executing native code invoked using a method handle obtained from the native linker, or is attached to the VM with the Java Native Interface with no Java frames on its stack. Native code does not include Java virtual machine support code, compiled code generated by the Java virtual machine, or special cases such as a thread blocked on a JVM TI raw monitor. Returns:boolean `true` if the thread is executing native code; `false` otherwise.

public boolean isInNative()

Tests if the thread associated with this ThreadInfo is executing native code.

A thread is considered to be executing native code when it is executing a native method, executing native code invoked using a method handle obtained from the native linker, or is attached to the VM with the Java Native Interface with no Java frames on its stack.

Native code does not include Java virtual machine support code, compiled code generated by the Java virtual machine, or special cases such as a thread blocked on a JVM TI raw monitor.

Returns:boolean: true if the thread is executing native code; false otherwise.

isSuspended back to summary

isSuspended	back to summary
public boolean isSuspended() Tests if the thread associated with this `ThreadInfo` is suspended. Returns:boolean `true` if the thread is suspended; `false` otherwise. External Specification JVM Tool Interface

public boolean isSuspended()

Tests if the thread associated with this ThreadInfo is suspended.

Returns:boolean: true if the thread is suspended; false otherwise.
External Specification: JVM Tool Interface

toString

back to summary

public String toString()

Overrides java.lang.Object.toString.

Returns a string representation of this thread info. The format of this string depends on the implementation. The returned string will typically include the thread name, the thread ID, its state, and a stack trace if any.

Returns:String: a string representation of this thread info.

public Class ThreadInfo

General thread information

Execution information

Synchronization Statistics

MXBean Mapping

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail