Class ThreadDeadlockDetector

java.lang.Object

org.h2.util.ThreadDeadlockDetector

public class ThreadDeadlockDetector
extends Object

Detects deadlocks between threads. Prints out data in the same format as the CTRL-BREAK handler, but includes information about table locks.

Field Summary

Fields

Modifier and Type	Field	Description
private static ThreadDeadlockDetector	detector
private static final String	INDENT
private final ThreadMXBean	threadBean

Constructor Summary

Constructors

Modifier	Constructor	Description
private	ThreadDeadlockDetector()

Method Summary

Modifier and Type	Method	Description
(package private) void	checkForDeadlocks()	Checks if any threads are deadlocked.
static void	dumpAllThreadsAndLocks(String msg)	Dump all deadlocks (if any).
static void	dumpAllThreadsAndLocks(String msg, PrintStream out)	Dump all deadlocks (if any).
private static void	dumpThreadsAndLocks(String msg, ThreadMXBean threadBean, long[] threadIds, PrintStream out)
static void	init()	Initialize the detector.
private static void	printLockInfo(PrintWriter print, LockInfo[] locks, String tableWaitingForLock, ArrayList<String> tableExclusiveLocks, ArrayList<String> tableSharedLocksMap)
private static void	printThread(PrintWriter print, ThreadInfo ti)
private static void	printThreadInfo(PrintWriter print, ThreadInfo ti)

Methods inherited from class Object

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

Field Details

INDENT

private static final String INDENT

See Also:

• Constant Field Values

detector

private static ThreadDeadlockDetector detector

threadBean

private final ThreadMXBean threadBean

Constructor Details

ThreadDeadlockDetector

private ThreadDeadlockDetector()

Method Details

init

public static void init()

Initialize the detector.

checkForDeadlocks

void checkForDeadlocks()

Checks if any threads are deadlocked. If any, print the thread dump information.

dumpAllThreadsAndLocks

public static void dumpAllThreadsAndLocks(String msg)

Dump all deadlocks (if any).

Parameters:

msg - the message

dumpAllThreadsAndLocks

public static void dumpAllThreadsAndLocks(String msg,
 PrintStream out)

Dump all deadlocks (if any).

Parameters:

msg - the message

out - the output

dumpThreadsAndLocks

private static void dumpThreadsAndLocks(String msg,
 ThreadMXBean threadBean,
 long[] threadIds,
 PrintStream out)

printThreadInfo

private static void printThreadInfo(PrintWriter print,
 ThreadInfo ti)

printThread

private static void printThread(PrintWriter print,
 ThreadInfo ti)

printLockInfo

private static void printLockInfo(PrintWriter print,
 LockInfo[] locks,
 String tableWaitingForLock,
 ArrayList<String> tableExclusiveLocks,
 ArrayList<String> tableSharedLocksMap)