arthas排查程序卡住问题

arthas排查程序卡住问题

线程状态转换图

@startuml
title Java Thread State Transition
skinparam backgroundColor #FFFFFF
skinparam state {
  BackgroundColor<<New>> LightBlue
  BackgroundColor<<Runnable>> LightGreen
  BackgroundColor<<Blocked>> LightCoral
  BackgroundColor<<Waiting>> Khaki
  BackgroundColor<<Timed_Waiting>> LightGoldenrodYellow
  BackgroundColor<<Terminated>> LightGray

  BorderColor Black
  FontColor Black
  FontSize 12
  FontName "Segoe UI"
  RoundCorner 15
}

skinparam ArrowColor DarkSlateGray
skinparam ArrowFontSize 11
skinparam ArrowFontName "Segoe UI"
skinparam ArrowFontColor DarkSlateGray

legend right
  |= 状态 |= 说明 |
  | <&circle> New | 新建状态，线程刚创建 |
  | <&circle> Runnable | 可运行状态，等待CPU调度 |
  | <&circle> Blocked | 阻塞，等待锁监视器 |
  | <&circle> Waiting | 无限期等待 |
  | <&circle> Timed_Waiting | 有限期等待 |
  | <&circle> Terminated | 线程终止 |
endlegend

state "New" as New <<New>>
state "Runnable" as Runnable <<Runnable>>
state "Blocked" as Blocked <<Blocked>>
state "Waiting" as Waiting <<Waiting>>
state "Timed Waiting" as Timed_Waiting <<Timed_Waiting>>
state "Terminated" as Terminated <<Terminated>>

[*] --> New : 线程被创建
New --> Runnable : start()

Runnable --> Blocked : synchronized\n(waiting to enter monitor)
Blocked --> Runnable : synchronized\n(enter monitor)

Runnable --> Waiting : wait()\njoin()\nLockSupport.park()
Waiting --> Runnable : notify()/notifyAll()\n子线程结束\nLockSupport.unpark()\ninterrupt()且enter monitor
Waiting --> Blocked : notify()/notifyAll()\ninterrupt()且wait to enter monitor

Runnable --> Timed_Waiting : sleep()\nwait(long)\njoin(long)\nLockSupport.parkNanos()\nLockSupport.parkUntil()
Timed_Waiting --> Runnable : Timed Waiting结束\nnotify()/notifyAll()\nLockSupport.unpark()\ninterrupt()且enter monitor
Timed_Waiting --> Blocked : Timed Waiting结束\nnotify()/notifyAll()\ninterrupt()且wait to enter monitor

Runnable --> Terminated : 1、线程执行结束\n2、发生异常
Waiting --> Terminated : Exception
Timed_Waiting --> Terminated : Exception
@enduml

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