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AQS源码图解

AQS源码图解

2021-05-23 16:39:17   0  举报

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AQS源码图解

AQS

源码解析

图解

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大纲/内容

true

fasle

shouldPark

tryAcquire

AbstractQueuedSynchronizer

Thread.currentThread().interrupt();

tail==null

new Node()并CAS head(初始化队列)

park

内部

cancelAcquire

pre == head

false

State==0 

Return false 

acquire

CAS state 

AbstractOwnableSynchronizer

rerutn true;

selfInterrupt

pred.waitStatus=-1

无限循环(自旋)

Sync

CAS 加入队尾 

state

acquireQueued

enq 内部无限循环(自旋)

head

enq & return node 

return node

tail

将cancelled节点退出队列

当前线程持有锁 

Set ExclusiveOwnerThread & return true 

setHead;failed=false;

pred.waitStatus==-1(signal)

NonfairSync

Set ExclusiveOwnerThread 

addWaiter

State++ & return true 

interrupted= Thread.interrupted()

CAS tail(加入队尾)return tail

new Node(currentThread)

failed=true;interrupted=false;

Thread exclusiveOwnerThread

finally代码块failed==true

pred.waitStatus>0(cancelled)

NonfairSync.lock

return interrupted

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基础源码构建

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AQS源码

AQS(CLH) AbstractQueuedSynchronizer源码流程

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AQS(CLH) AbstractQueuedSynchronizer源码流程

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AQS源码分析

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