知识储备
Java中的线程类Thread是从1.0开始便提供给使用者的工具，用于并行计算。
线程特点
Thread有如下特点：
-
线程的创建主要通过
Thread(Runnable target)
进行创建 -
每个线程具有优先级，高优先级的线程会比低优先级的线程；
-
线程主要分为Daemon线程的非Daemon线程（也叫User线程）两类；
-
线程的Daemon属性可以通过
setDaemon
和
isDaemon
两个接口修改和查询 - 一旦线程开始运行（执行start），就不再允许修改Daemon标志位；
- 一旦所有的非Daemon线程均结束，JVM将会停止；
- Daemon线程创建的子线程都默认为Daemon，非Daemon线程创建的线程默认都是非Daemon，但是所有线程，不管被谁创建，都可以在启动之前修改自己是否是Daemon线程的属性；
-
线程的Daemon属性可以通过
-
每一个线程除了拥有自己的线程名、优先级、Daemon等属性之外，其实还拥有自己的ThreadGroup信息
- ThreadGroup是一组Thread的集合，可以在这个集合里面统一的管理所有的线程
- 如果一个线程通过不带ThreadGroup的构造函数创建，或者通过传入一个null的ThreadGroup作为入参的构造函数创建的话，该线程将默认继承其父线程的ThreadGroup信息。
-
JVM中的线程是树状关系
- 两个不同的线程可以拥有一个共同的祖先，但是两个不同的线程不可以拥有一个共同的子孙
- 在整颗树形节点中，每一个节点既可以是线程，也可以是线程组；
-
这颗树状关系的根节点是
system
线程组 -
JVM启动之后，主线程会创建一个默认的线程组
main
，也就意味着，所有用户创建的非Daemon线程，均会被默认划分在main线程组中 -
可以在程序运行时断定，然后执行
Thread.currentThread().getThreadGroup()
找到当前线程所属的线程组，并不断通过
ThreadGroup#getParent()
获取父线程组。
（注，Thread不支持直接查找父线程，ThreadGroup只能查找自己的父线程组）
-
Java的线程提供了类似Posix Thread标准的线程操作接口：
- Thread currentThread(); // 获取当前线程的引用
- void yield(); // 线程让步（暂时放弃CPU资源，让线程重新回到RUNNABLE状态，不接受中断）
- void sleep(long millis) throws InterruptedException; // 线程休眠
-
void start(); // 线程实际创建函数
- start后会实际执行native方法start0
- 线程在整个生命周期内只能执行一次start（之后会讲解线程池是如何避开这个约束的）
-
void join(final long millis) throws InterruptedException; // 阻塞主线程，等待子线程任务执行完毕
- 注意，如果join在start之前被执行，则父线程仅仅只是等到当前子线程执行完毕才会被回收，但是不会阻塞父线程的任务执行；
- 如果join在start之后被执行，则父线程会被阻塞，直到当前线程的任务全部执行完成，才能够继续执行join之后的任务。
- millis为0表示父线程会被一直阻塞直到子线程完成；millis为正数表示父线程会等待millis毫秒，如果子线程在规定时间内完成或者超时，父线程均会停止等待；
- join(long millis, int nanos)这个函数中，nanos其实不会真的被进行计时，而是会被换算成millis然后向上取整（是的，你没看错，JDK在这里耍赖了，我这里参考的源码时Oracle JDK 15）
操作系统的线程状态转换
在查看Java的线程状态转换之前，首先回顾一下经典的操作系统的线程状态转换
- new为线程的新生状态，创建后的初始状态即为此状态，此时线程既没有CPU资源也没有内存资源；
- ready为线程的就绪状态，此时线程在就绪队列中等待被执行，线程提交之后转变成该状态，此时线程持有自己的内存资源，等待操作系统的调度器sheduler分配CPU资源；
- running为线程的运行状态，此时线程从错做系统的调度器sheduler获取了CPU资源，开始进行自己的线程计算动作，此状态下，可能会受到时钟中断的影响（比如时间片耗尽），OS会挂起当前线程，重新转换回ready状态；
-
waiting为线程的等待状态，通常会有三种情况触发线程转换成该状态：
- 此时线程通常会触发CPU的一个陷阱(trap)导致用户态线程被挂起，等待trap所触发的内核态进程返回结果，这个结果通常在内核态进程发出中断(interrupt)之后，唤醒用户态线程从而才能获取到。而触发trap之后等待interrupt的线程状态，就是waiting状态。waiting状态的线程被唤醒之后，将获取到的结果寄存到自己的栈空间中，让在就绪队列等待CPU资源从而进行消费；
- 向操作系统获取临界资源失败后，等待临界资源释放；
- 等待其他任务到达（join）
- terminated为线程的终止状态，此时线程可能执行完了自己所有的任务，随之走向终止；也可能线程自行强行终止；也可能被操作系统强行回收等等。
Java线程状态转换
与操作系统类似的，Java线程提供了6个状态，位于java.lang.Thread.State，用于线程状态的管理和状态转换：
-
NEW
- 对应操作系统的线程状态中的new状态
- 线程创建完成之后，还没执行start方法之前的状态
- 此时线程实际上还没有开始在OS中申请资源，也没有进行栈分配，也即jstack查看的消息中，栈地址是0x0000000000000000
- 此时JDK中的线程检查工具包无法监控当前线程的信息
- 标志位存在java.lang.Thread#threadStatus的第1位（最低位）
-
RUNNABLE
- 对应操作系统的running状态，表示一个线程正在运行
- 或者对应操作系统的ready状态，表示一个线程可以被运行，仅仅只是缺少CPU资源
- 此状态通常为Thread已经调用的start0这个native方法之后的状态，或者阻塞终止之后，继续运行的状态
- 此时线程会持有自己的栈空间（不管是ready还是running）
- 标志位存在java.lang.Thread#threadStatus的第3位
-
BLOCKED
- 对应操作系统的waiting状态，表示线程长在等待获取一把互斥锁
-
此状态通常为线程在等待monitor lock时，因为获取不到而被阻塞；等待monitor lock的典型场景为：
- synchronized方法或者代码块的开始，未获取到monitor lock从而导致BLOCKED
- lock.wait结束之后，和其他线程争抢monitor lock时未获取到导致自己被BLOCKED
-
WAITING
- 同样对应操作系统的waiting状态，表示线程正在等待另一个线程执行完成（和BLOCKED目的不一样）
- 此状态通常为线程在synchronized代码块中，被锁对象执行lock.wait()暂停；此时线程会放弃原本被synchronized代码块锁住的锁对象。
- 或者当前线程被子线程join，也会造成当前父线程WAITING，等待子线程完成并唤醒；
-
或者当前线程使用
LockSupport.park()
进行暂停；（parking可以被
thread.interrupt()
和
LockSupport.unpark(thread)
重新唤醒)
-
TIMED_WAITING
- 同样对应操作系统的waiting状态，表示线程此时正在等待一个时间中断被唤醒
-
此状态通常为Thread在规定时间内等待互斥锁，常见的操作为
- Thread.sleep()；
- Object.wait()一段时间，非0；（注：Java中没有真实计算纳秒，而是向上取整换算成了毫秒进行的计算）
- Thread.join()，入参非0；（注：Java中没有真实计算纳秒，而是向上取整换算成了毫秒进行的计算）
- LockSupport.parkNanos，暂停非0ns的时间；
- LockSupport.parkUntil，暂停至某一个目的时间；
-
TERMINATED
- 线程结束后的状态
线程状态变换
下图是一个我目前为止找到的比较好的线程状态示意图：
Jstack捕获的Thread信息
下图为一个测试demo随机捕获的栈信息，可以试着使用上述内容进行分析。
"Monitor Ctrl-Break" #21 daemon prio=5 os_prio=0 cpu=31.25ms elapsed=0.80s tid=0x0000019ead781240 nid=0x2ab4 runnable [0x000000830d6fe000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.SocketDispatcher.read0(java.base@15.0.1/Native Method)
at sun.nio.ch.SocketDispatcher.read(java.base@15.0.1/SocketDispatcher.java:46)
at sun.nio.ch.NioSocketImpl.tryRead(java.base@15.0.1/NioSocketImpl.java:261)
at sun.nio.ch.NioSocketImpl.implRead(java.base@15.0.1/NioSocketImpl.java:312)
at sun.nio.ch.NioSocketImpl.read(java.base@15.0.1/NioSocketImpl.java:350)
at sun.nio.ch.NioSocketImpl$1.read(java.base@15.0.1/NioSocketImpl.java:803)
at java.net.Socket$SocketInputStream.read(java.base@15.0.1/Socket.java:981)
at sun.nio.cs.StreamDecoder.readBytes(java.base@15.0.1/StreamDecoder.java:297)
at sun.nio.cs.StreamDecoder.implRead(java.base@15.0.1/StreamDecoder.java:339)
at sun.nio.cs.StreamDecoder.read(java.base@15.0.1/StreamDecoder.java:188)
- locked <0x000000071941d1d0> (a java.io.InputStreamReader)
at java.io.InputStreamReader.read(java.base@15.0.1/InputStreamReader.java:181)
at java.io.BufferedReader.fill(java.base@15.0.1/BufferedReader.java:161)
at java.io.BufferedReader.readLine(java.base@15.0.1/BufferedReader.java:326)
- locked <0x000000071941d1d0> (a java.io.InputStreamReader)
at java.io.BufferedReader.readLine(java.base@15.0.1/BufferedReader.java:392)
at com.intellij.rt.execution.application.AppMainV2$1.run(AppMainV2.java:47)
"Thread-2" #25 daemon prio=5 os_prio=0 cpu=109.38ms elapsed=0.79s tid=0x0000019ead85b8c0 nid=0xa70 runnable [0x000000830dcfe000]
java.lang.Thread.State: RUNNABLE
at java.io.PrintStream.write(java.base@15.0.1/PrintStream.java:566)
- locked <0x0000000719649010> (a java.io.PrintStream)
at sun.nio.cs.StreamEncoder.writeBytes(java.base@15.0.1/StreamEncoder.java:242)
at sun.nio.cs.StreamEncoder.implFlushBuffer(java.base@15.0.1/StreamEncoder.java:321)
at sun.nio.cs.StreamEncoder.flushBuffer(java.base@15.0.1/StreamEncoder.java:110)
- locked <0x0000000719649320> (a java.io.OutputStreamWriter)
at java.io.OutputStreamWriter.flushBuffer(java.base@15.0.1/OutputStreamWriter.java:181)
at java.io.PrintStream.writeln(java.base@15.0.1/PrintStream.java:723)
- locked <0x0000000719649010> (a java.io.PrintStream)
at java.io.PrintStream.println(java.base@15.0.1/PrintStream.java:1028)
at concurrent.Main.lambda$main$1(Main.java:22)
at concurrent.Main$$Lambda$14/0x0000000800bb1240.run(Unknown Source)
at java.lang.Thread.run(java.base@15.0.1/Thread.java:832)
"Common-Cleaner" #20 daemon prio=8 os_prio=1 cpu=0.00ms elapsed=0.85s tid=0x0000019ead6d5430 nid=0xf38 in Object.wait() [0x000000830d2fe000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(java.base@15.0.1/Native Method)
- waiting on <0x00000007196b3a00> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base@15.0.1/ReferenceQueue.java:155)
- locked <0x00000007196b3a00> (a java.lang.ref.ReferenceQueue$Lock)
at jdk.internal.ref.CleanerImpl.run(java.base@15.0.1/CleanerImpl.java:148)
at java.lang.Thread.run(java.base@15.0.1/Thread.java:832)
at jdk.internal.misc.InnocuousThread.run(java.base@15.0.1/InnocuousThread.java:134)
"main" #1 prio=5 os_prio=0 cpu=109.38ms elapsed=0.91s tid=0x0000019e87110a30 nid=0x2a94 in Object.wait() [0x000000830c3ff000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(java.base@15.0.1/Native Method)
- waiting on <0x000000071947ac90> (a java.lang.Thread)
at java.lang.Thread.join(java.base@15.0.1/Thread.java:1303)
- locked <0x000000071947ac90> (a java.lang.Thread)
at java.lang.Thread.join(java.base@15.0.1/Thread.java:1371)
at concurrent.Main.main(Main.java:42)
"Thread-0" #23 prio=5 os_prio=0 cpu=31.25ms elapsed=0.79s tid=0x0000019ead85af20 nid=0x2564 waiting for monitor entry [0x000000830daff000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.io.PrintStream.writeln(java.base@15.0.1/PrintStream.java:718)
- waiting to lock <0x0000000719649010> (a java.io.PrintStream)
at java.io.PrintStream.println(java.base@15.0.1/PrintStream.java:1028)
at concurrent.Main.lambda$main$1(Main.java:22)
at concurrent.Main$$Lambda$14/0x0000000800bb1240.run(Unknown Source)
at java.lang.Thread.run(java.base@15.0.1/Thread.java:832)
"Thread-1" #24 prio=5 os_prio=0 cpu=93.75ms elapsed=0.79s tid=0x0000019ead85b3f0 nid=0x2b64 waiting for monitor entry [0x000000830dbff000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.io.PrintStream.writeln(java.base@15.0.1/PrintStream.java:718)
- waiting to lock <0x0000000719649010> (a java.io.PrintStream)
at java.io.PrintStream.println(java.base@15.0.1/PrintStream.java:1028)
at concurrent.Main.lambda$main$1(Main.java:22)
at concurrent.Main$$Lambda$14/0x0000000800bb1240.run(Unknown Source)
at java.lang.Thread.run(java.base@15.0.1/Thread.java:832)
"Thread-3" #26 daemon prio=5 os_prio=0 cpu=31.25ms elapsed=0.79s tid=0x0000019ead85c210 nid=0x1a0c waiting for monitor entry [0x000000830ddff000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.io.PrintStream.writeln(java.base@15.0.1/PrintStream.java:718)
- waiting to lock <0x0000000719649010> (a java.io.PrintStream)
at java.io.PrintStream.println(java.base@15.0.1/PrintStream.java:1028)
at concurrent.Main.lambda$main$1(Main.java:22)
at concurrent.Main$$Lambda$14/0x0000000800bb1240.run(Unknown Source)
at java.lang.Thread.run(java.base@15.0.1/Thread.java:832)
"Thread-4" #27 prio=5 os_prio=0 cpu=78.12ms elapsed=0.79s tid=0x0000019ead860b70 nid=0x433c waiting for monitor entry [0x000000830deff000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.io.PrintStream.writeln(java.base@15.0.1/PrintStream.java:718)
- waiting to lock <0x0000000719649010> (a java.io.PrintStream)
at java.io.PrintStream.println(java.base@15.0.1/PrintStream.java:1028)
at concurrent.Main.lambda$main$1(Main.java:22)
at concurrent.Main$$Lambda$14/0x0000000800bb1240.run(Unknown Source)
at java.lang.Thread.run(java.base@15.0.1/Thread.java:832)
"Thread-5" #28 prio=5 os_prio=0 cpu=31.25ms elapsed=0.79s tid=0x0000019ead861040 nid=0x2d84 waiting for monitor entry [0x000000830dfff000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.io.PrintStream.writeln(java.base@15.0.1/PrintStream.java:718)
- waiting to lock <0x0000000719649010> (a java.io.PrintStream)
at java.io.PrintStream.println(java.base@15.0.1/PrintStream.java:1028)
at concurrent.Main.lambda$main$1(Main.java:22)
at concurrent.Main$$Lambda$14/0x0000000800bb1240.run(Unknown Source)
at java.lang.Thread.run(java.base@15.0.1/Thread.java:832)
"Thread-6" #29 prio=5 os_prio=0 cpu=62.50ms elapsed=0.79s tid=0x0000019ead861f00 nid=0x690 waiting for monitor entry [0x000000830e0ff000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.io.PrintStream.writeln(java.base@15.0.1/PrintStream.java:718)
- waiting to lock <0x0000000719649010> (a java.io.PrintStream)
at java.io.PrintStream.println(java.base@15.0.1/PrintStream.java:1028)
at concurrent.Main.lambda$main$1(Main.java:22)
at concurrent.Main$$Lambda$14/0x0000000800bb1240.run(Unknown Source)
at java.lang.Thread.run(java.base@15.0.1/Thread.java:832)
"Thread-7" #30 prio=5 os_prio=0 cpu=78.12ms elapsed=0.79s tid=0x0000019ead864580 nid=0x2a40 waiting for monitor entry [0x000000830e1ff000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.io.PrintStream.writeln(java.base@15.0.1/PrintStream.java:718)
- waiting to lock <0x0000000719649010> (a java.io.PrintStream)
at java.io.PrintStream.println(java.base@15.0.1/PrintStream.java:1028)
at concurrent.Main.lambda$main$1(Main.java:22)
at concurrent.Main$$Lambda$14/0x0000000800bb1240.run(Unknown Source)
at java.lang.Thread.run(java.base@15.0.1/Thread.java:832)
"subThread-2" #35 prio=5 os_prio=0 cpu=62.50ms elapsed=0.78s tid=0x0000019ead863be0 nid=0x340c waiting for monitor entry [0x000000830d9fe000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.io.PrintStream.writeln(java.base@15.0.1/PrintStream.java:718)
- waiting to lock <0x0000000719649010> (a java.io.PrintStream)
at java.io.PrintStream.println(java.base@15.0.1/PrintStream.java:1028)
at concurrent.Main.lambda$main$0(Main.java:12)
at concurrent.Main$$Lambda$17/0x0000000800bb1460.run(Unknown Source)
at java.lang.Thread.run(java.base@15.0.1/Thread.java:832)
"subThread-6" #36 prio=5 os_prio=0 cpu=46.88ms elapsed=0.78s tid=0x0000019ead8628a0 nid=0x3c48 waiting for monitor entry [0x000000830e2fe000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.io.PrintStream.writeln(java.base@15.0.1/PrintStream.java:718)
- waiting to lock <0x0000000719649010> (a java.io.PrintStream)
at java.io.PrintStream.println(java.base@15.0.1/PrintStream.java:1028)
at concurrent.Main.lambda$main$0(Main.java:12)
at concurrent.Main$$Lambda$17/0x0000000800bb1460.run(Unknown Source)
at java.lang.Thread.run(java.base@15.0.1/Thread.java:832)
"subThread-4" #39 prio=5 os_prio=0 cpu=46.88ms elapsed=0.78s tid=0x0000019ead861a30 nid=0x1c40 waiting for monitor entry [0x000000830e3ff000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.io.PrintStream.writeln(java.base@15.0.1/PrintStream.java:718)
- waiting to lock <0x0000000719649010> (a java.io.PrintStream)
at java.io.PrintStream.println(java.base@15.0.1/PrintStream.java:1028)
at concurrent.Main.lambda$main$0(Main.java:12)
at concurrent.Main$$Lambda$17/0x0000000800bb1460.run(Unknown Source)
at java.lang.Thread.run(java.base@15.0.1/Thread.java:832)
"subThread-5" #32 prio=5 os_prio=0 cpu=156.25ms elapsed=0.78s tid=0x0000019ead8640b0 nid=0xc4 waiting for monitor entry [0x000000830e4ff000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.io.PrintStream.writeln(java.base@15.0.1/PrintStream.java:718)
- waiting to lock <0x0000000719649010> (a java.io.PrintStream)
at java.io.PrintStream.println(java.base@15.0.1/PrintStream.java:1028)
at concurrent.Main.lambda$main$0(Main.java:12)
at concurrent.Main$$Lambda$17/0x0000000800bb1460.run(Unknown Source)
at java.lang.Thread.run(java.base@15.0.1/Thread.java:832)
"subThread-1" #34 prio=5 os_prio=0 cpu=62.50ms elapsed=0.78s tid=0x0000019ead863240 nid=0xcd4 waiting for monitor entry [0x000000830e5fe000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.io.PrintStream.writeln(java.base@15.0.1/PrintStream.java:718)
- waiting to lock <0x0000000719649010> (a java.io.PrintStream)
at java.io.PrintStream.println(java.base@15.0.1/PrintStream.java:1028)
at concurrent.Main.lambda$main$0(Main.java:12)
at concurrent.Main$$Lambda$17/0x0000000800bb1460.run(Unknown Source)
at java.lang.Thread.run(java.base@15.0.1/Thread.java:832)
"subThread-3" #33 prio=5 os_prio=0 cpu=31.25ms elapsed=0.78s tid=0x0000019ead861560 nid=0x47fc waiting for monitor entry [0x000000830e6fe000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.io.PrintStream.writeln(java.base@15.0.1/PrintStream.java:718)
- waiting to lock <0x0000000719649010> (a java.io.PrintStream)
at java.io.PrintStream.println(java.base@15.0.1/PrintStream.java:1028)
at concurrent.Main.lambda$main$0(Main.java:12)
at concurrent.Main$$Lambda$17/0x0000000800bb1460.run(Unknown Source)
at java.lang.Thread.run(java.base@15.0.1/Thread.java:832)
"subThread-7" #37 prio=5 os_prio=0 cpu=31.25ms elapsed=0.78s tid=0x0000019ead8623d0 nid=0x714 waiting for monitor entry [0x000000830e7fe000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.io.PrintStream.writeln(java.base@15.0.1/PrintStream.java:718)
- waiting to lock <0x0000000719649010> (a java.io.PrintStream)
at java.io.PrintStream.println(java.base@15.0.1/PrintStream.java:1028)
at concurrent.Main.lambda$main$0(Main.java:12)
at concurrent.Main$$Lambda$17/0x0000000800bb1460.run(Unknown Source)
at java.lang.Thread.run(java.base@15.0.1/Thread.java:832)
"subThread-0" #38 prio=5 os_prio=0 cpu=109.38ms elapsed=0.78s tid=0x0000019ead862d70 nid=0x3b4 waiting for monitor entry [0x000000830e8fe000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.io.PrintStream.writeln(java.base@15.0.1/PrintStream.java:718)
- waiting to lock <0x0000000719649010> (a java.io.PrintStream)
at java.io.PrintStream.println(java.base@15.0.1/PrintStream.java:1028)
at concurrent.Main.lambda$main$0(Main.java:12)
at concurrent.Main$$Lambda$17/0x0000000800bb1460.run(Unknown Source)
at java.lang.Thread.run(java.base@15.0.1/Thread.java:832)
"Reference Handler" #2 daemon prio=10 os_prio=2 cpu=0.00ms elapsed=0.89s tid=0x0000019eacd9e4e0 nid=0xd34 waiting on condition [0x000000830caff000]
java.lang.Thread.State: RUNNABLE
at java.lang.ref.Reference.waitForReferencePendingList(java.base@15.0.1/Native Method)
at java.lang.ref.Reference.processPendingReferences(java.base@15.0.1/Reference.java:241)
at java.lang.ref.Reference$ReferenceHandler.run(java.base@15.0.1/Reference.java:213)
"Finalizer" #3 daemon prio=8 os_prio=1 cpu=0.00ms elapsed=0.89s tid=0x0000019ead5a2090 nid=0xd14 in Object.wait() [0x000000830cbff000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(java.base@15.0.1/Native Method)
- waiting on <0x000000071960c6d8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base@15.0.1/ReferenceQueue.java:155)
- locked <0x000000071960c6d8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base@15.0.1/ReferenceQueue.java:176)
at java.lang.ref.Finalizer$FinalizerThread.run(java.base@15.0.1/Finalizer.java:170)
"Signal Dispatcher" #4 daemon prio=9 os_prio=2 cpu=0.00ms elapsed=0.87s tid=0x0000019ead5c4750 nid=0x36c0 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Attach Listener" #5 daemon prio=5 os_prio=2 cpu=0.00ms elapsed=0.87s tid=0x0000019ead5c7020 nid=0x1424 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Service Thread" #6 daemon prio=9 os_prio=0 cpu=0.00ms elapsed=0.87s tid=0x0000019ead5c88f0 nid=0x1f0c runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread0" #7 daemon prio=9 os_prio=2 cpu=109.38ms elapsed=0.87s tid=0x0000019ead5c94e0 nid=0x46ec waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task
"C1 CompilerThread0" #15 daemon prio=9 os_prio=2 cpu=46.88ms elapsed=0.87s tid=0x0000019ead5cd390 nid=0x3ce0 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task
"Sweeper thread" #19 daemon prio=9 os_prio=2 cpu=0.00ms elapsed=0.87s tid=0x0000019ead5ceca0 nid=0x1c0c runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C1 CompilerThread1" #16 daemon prio=9 os_prio=2 cpu=15.62ms elapsed=0.84s tid=0x0000019ead6da1b0 nid=0x215c waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task
"C1 CompilerThread2" #17 daemon prio=9 os_prio=2 cpu=15.62ms elapsed=0.84s tid=0x0000019ead6dc780 nid=0x47c0 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task
"C2 CompilerThread1" #8 daemon prio=9 os_prio=2 cpu=46.88ms elapsed=0.83s tid=0x0000019ead7466a0 nid=0x16f4 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task
"Notification Thread" #22 daemon prio=9 os_prio=0 cpu=0.00ms elapsed=0.80s tid=0x0000019ead781710 nid=0x3fe0 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"C1 CompilerThread3" #18 daemon prio=9 os_prio=2 cpu=0.00ms elapsed=0.76s tid=0x0000019eadc19220 nid=0x150 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task
"C2 CompilerThread2" #9 daemon prio=9 os_prio=2 cpu=0.00ms elapsed=0.67s tid=0x0000019eadc14360 nid=0x2804 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
No compile task
"VM Thread" os_prio=2 cpu=15.62ms elapsed=0.89s tid=0x0000019eacd9ce50 nid=0x4534 runnable
"GC Thread#0" os_prio=2 cpu=0.00ms elapsed=0.90s tid=0x0000019e871614d0 nid=0x674 runnable
"G1 Main Marker" os_prio=2 cpu=0.00ms elapsed=0.90s tid=0x0000019e87172b90 nid=0x15e8 runnable
"G1 Conc#0" os_prio=2 cpu=0.00ms elapsed=0.90s tid=0x0000019e87173610 nid=0x34b4 runnable
"G1 Refine#0" os_prio=2 cpu=0.00ms elapsed=0.90s tid=0x0000019e871e0810 nid=0x38a0 runnable
"G1 Young RemSet Sampling" os_prio=2 cpu=0.00ms elapsed=0.90s tid=0x0000019e871e12a0 nid=0x35fc runnable
"VM Periodic Task Thread" os_prio=2 cpu=0.00ms elapsed=0.79s tid=0x0000019ead8506d0 nid=0x1c24 waiting on condition
JNI global refs: 23, weak refs: 0
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