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java线程状态及转换     所属分类 java 浏览量 253
初始(NEW)  新建线程 还未调用 start 方法
运行(RUNNABLE)   就绪(ready)和 运行中(running)调用start方法,进入就绪状态 ,获得CPU时间片后运行(running)
阻塞(BLOCKED)    线程阻塞于锁
等待(WAITING)    等待通知或中断
超时等待(TIMED_WAITING) 
终止(TERMINATED)  线程已经执行完毕,再次调用start方法,抛 java.lang.IllegalThreadStateException 异常


等待队列 同步队列
同步队列里放争抢锁的线程


Thread.sleep(long millis)     当前线程进入TIMED_WAITING状态,不释放锁
Thread.yield()  放弃获取的CPU时间片,不释放锁 ,由运行状态变为就绪状态
thread.join()/thread.join(long millis)    join基于wait实现  
obj.wait()     当前线程释放锁,进入等待队列
obj.notify()   唤醒该对象监视器上等待的单个线程 
obj.notifyAll  唤醒等待的所有线程

LockSupport.park()
LockSupport.parkNanos(long nanos)
LockSupport.parkUntil(long deadlines)

当前线程进入WAITING/TIMED_WAITING状态
对比wait方法,不需要获取锁就可以让线程进入WAITING/TIMED_WAITING状态,
通过LockSupport.unpark(Thread thread)唤醒


各种线程状态实例代码 https://gitee.com/dyyx/hellocode/blob/master/src/ThreadStateTest.java ps -ef|grep ThreadStateTest jstack PID 各种线程状态统计 jstack PID|grep java.lang.Thread.State: |sort|uniq -c|sort -rn 7 java.lang.Thread.State: TIMED_WAITING (sleeping) 7 java.lang.Thread.State: RUNNABLE 3 java.lang.Thread.State: WAITING (parking) 3 java.lang.Thread.State: WAITING (on object monitor) 2 java.lang.Thread.State: TIMED_WAITING (parking) 1 java.lang.Thread.State: TIMED_WAITING (on object monitor) 1 java.lang.Thread.State: BLOCKED (on object monitor)
完整线程堆栈信息 2020-12-11 08:18:58 Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.121-b13 mixed mode): "Attach Listener" #26 daemon prio=9 os_prio=31 tid=0x00007f88f485c000 nid=0x4b07 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "consumer3-timeout" #25 prio=5 os_prio=31 tid=0x00007f88f60be000 nid=0x9d03 waiting on condition [0x00007000020e7000] java.lang.Thread.State: TIMED_WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000007955f6128> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078) at java.util.concurrent.LinkedBlockingQueue.poll(LinkedBlockingQueue.java:467) at ThreadStateTest.consumerTimeout(ThreadStateTest.java:229) at ThreadStateTest$$Lambda$17/1096979270.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) "consumer2" #24 prio=5 os_prio=31 tid=0x00007f88f486e000 nid=0x9e03 waiting on condition [0x0000700001fe4000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000007955f6128> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039) at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442) at ThreadStateTest.consumer(ThreadStateTest.java:214) at ThreadStateTest$$Lambda$16/990368553.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) "consumer1" #23 prio=5 os_prio=31 tid=0x00007f88f60bd800 nid=0xa003 waiting on condition [0x0000700001ee1000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000007955f6128> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039) at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442) at ThreadStateTest.consumer(ThreadStateTest.java:214) at ThreadStateTest$$Lambda$15/1324119927.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) "produce" #22 prio=5 os_prio=31 tid=0x00007f88f59df000 nid=0xa203 waiting on condition [0x0000700001dde000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at ThreadStateTest.doSleep(ThreadStateTest.java:104) at ThreadStateTest.produce(ThreadStateTest.java:203) at ThreadStateTest$$Lambda$13/2003749087.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) "longSleepThread2" #21 prio=5 os_prio=31 tid=0x00007f88f59de000 nid=0xa403 waiting on condition [0x0000700001cdb000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at ThreadStateTest.doSleep(ThreadStateTest.java:104) at ThreadStateTest.longSleep(ThreadStateTest.java:116) at ThreadStateTest$$Lambda$14/1086906493.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) "longSleepThread1" #20 prio=5 os_prio=31 tid=0x00007f88f59dd800 nid=0x5a03 waiting on condition [0x0000700001bd8000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at ThreadStateTest.doSleep(ThreadStateTest.java:104) at ThreadStateTest.longSleep(ThreadStateTest.java:116) at ThreadStateTest$$Lambda$12/424110450.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) "joinRunTimeout" #19 prio=5 os_prio=31 tid=0x00007f88f50f9800 nid=0x5903 in Object.wait() [0x0000700001ad5000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x0000000795ab37e0> (a java.lang.Thread) at java.lang.Thread.join(Thread.java:1257) - locked <0x0000000795ab37e0> (a java.lang.Thread) at ThreadStateTest.joinRunTimeout(ThreadStateTest.java:136) at ThreadStateTest$$Lambda$11/295530567.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) "joinRun" #18 prio=5 os_prio=31 tid=0x00007f88f50f8800 nid=0x5803 in Object.wait() [0x00007000019d2000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x0000000795a0cfe8> (a java.lang.Thread) at java.lang.Thread.join(Thread.java:1249) - locked <0x0000000795a0cfe8> (a java.lang.Thread) at java.lang.Thread.join(Thread.java:1323) at ThreadStateTest.joinRun(ThreadStateTest.java:124) at ThreadStateTest$$Lambda$10/1283928880.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) "reentranLockTry2" #17 prio=5 os_prio=31 tid=0x00007f88f59d7000 nid=0xa703 waiting on condition [0x00007000018cf000] java.lang.Thread.State: TIMED_WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000007955f5bd8> (a java.util.concurrent.locks.ReentrantLock$NonfairSync) at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215) at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireNanos(AbstractQueuedSynchronizer.java:934) at java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireNanos(AbstractQueuedSynchronizer.java:1247) at java.util.concurrent.locks.ReentrantLock.tryLock(ReentrantLock.java:442) at ThreadStateTest.reentranLockTry(ThreadStateTest.java:175) at ThreadStateTest$$Lambda$9/1915318863.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) "reentranLockTry1" #16 prio=5 os_prio=31 tid=0x00007f88f60b8800 nid=0xa803 waiting on condition [0x00007000017cc000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at ThreadStateTest.doSleep(ThreadStateTest.java:104) at ThreadStateTest.reentranLockTry(ThreadStateTest.java:185) at ThreadStateTest$$Lambda$8/250421012.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) "reentranLock2" #15 prio=5 os_prio=31 tid=0x00007f88f60b8000 nid=0x5503 waiting on condition [0x00007000016c9000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000007955f5ba8> (a java.util.concurrent.locks.ReentrantLock$NonfairSync) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:870) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199) at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:209) at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285) at ThreadStateTest.reentranLock(ThreadStateTest.java:162) at ThreadStateTest$$Lambda$7/455659002.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) "reentranLock1" #14 prio=5 os_prio=31 tid=0x00007f88f59d6000 nid=0x3e03 waiting on condition [0x00007000015c6000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at ThreadStateTest.doSleep(ThreadStateTest.java:104) at ThreadStateTest.reentranLock(ThreadStateTest.java:164) at ThreadStateTest$$Lambda$6/1705736037.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) "sync2" #13 prio=5 os_prio=31 tid=0x00007f88f59d5800 nid=0x4003 waiting for monitor entry [0x00007000014c3000] java.lang.Thread.State: BLOCKED (on object monitor) at ThreadStateTest.sync(ThreadStateTest.java:155) - waiting to lock <0x00000007955f4870> (a java.lang.Object) at ThreadStateTest$$Lambda$5/245257410.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) "sync1" #12 prio=5 os_prio=31 tid=0x00007f88f4832000 nid=0x4103 waiting on condition [0x00007000013c0000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at ThreadStateTest.doSleep(ThreadStateTest.java:104) at ThreadStateTest.sync(ThreadStateTest.java:155) - locked <0x00000007955f4870> (a java.lang.Object) at ThreadStateTest$$Lambda$4/1406718218.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) "yieldLoop" #11 prio=5 os_prio=31 tid=0x00007f88f60b7000 nid=0x3a03 runnable [0x00007000012bd000] java.lang.Thread.State: RUNNABLE at java.lang.Thread.yield(Native Method) at ThreadStateTest.yieldLoop(ThreadStateTest.java:148) at ThreadStateTest$$Lambda$3/1826771953.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) "Service Thread" #8 daemon prio=9 os_prio=31 tid=0x00007f88f4858800 nid=0x4303 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C1 CompilerThread2" #7 daemon prio=9 os_prio=31 tid=0x00007f88f483e000 nid=0x4403 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C2 CompilerThread1" #6 daemon prio=9 os_prio=31 tid=0x00007f88f483d000 nid=0x3403 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "C2 CompilerThread0" #5 daemon prio=9 os_prio=31 tid=0x00007f88f5024000 nid=0x3303 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Signal Dispatcher" #4 daemon prio=9 os_prio=31 tid=0x00007f88f5023000 nid=0x4703 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Finalizer" #3 daemon prio=8 os_prio=31 tid=0x00007f88f4824800 nid=0x4e03 in Object.wait() [0x0000700000aa5000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x0000000795588ec8> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143) - locked <0x0000000795588ec8> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164) at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209) "Reference Handler" #2 daemon prio=10 os_prio=31 tid=0x00007f88f4821800 nid=0x2c03 in Object.wait() [0x00007000009a2000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x0000000795586b68> (a java.lang.ref.Reference$Lock) at java.lang.Object.wait(Object.java:502) at java.lang.ref.Reference.tryHandlePending(Reference.java:191) - locked <0x0000000795586b68> (a java.lang.ref.Reference$Lock) at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153) "main" #1 prio=5 os_prio=31 tid=0x00007f88f6004000 nid=0x1203 waiting on condition [0x000070000028a000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at ThreadStateTest.main(ThreadStateTest.java:92) "VM Thread" os_prio=31 tid=0x00007f88f4821000 nid=0x5103 runnable "GC task thread#0 (ParallelGC)" os_prio=31 tid=0x00007f88f6007800 nid=0x1b07 runnable "GC task thread#1 (ParallelGC)" os_prio=31 tid=0x00007f88f5800000 nid=0x1c03 runnable "GC task thread#2 (ParallelGC)" os_prio=31 tid=0x00007f88f5802000 nid=0x2b03 runnable "GC task thread#3 (ParallelGC)" os_prio=31 tid=0x00007f88f6008800 nid=0x5303 runnable "VM Periodic Task Thread" os_prio=31 tid=0x00007f88f602e800 nid=0x3703 waiting on condition JNI global references: 334
java thread join实现原理 java线程状态 Lock和synchronized的区别 Java线程状态中BLOCKED和WAITING的区别

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ReentrantLock原理

基于 wait 和 notifyAll 实现简单的阻塞队列