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RenntrantLock.drawio
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<mxCell id="zObkzzUAoMXtNydKvx5d-14" value="<div style="text-align: justify"><span>这里获取锁是通过调用AQS的acquire()方法，acquire（）会调用 tryAcquire（），而tryAcquire 则是由各个自定义同步器实现。</span></div>" style="shape=note;size=20;whiteSpace=wrap;html=1;" parent="1" vertex="1">
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<mxCell id="zObkzzUAoMXtNydKvx5d-40" value="自旋获取锁#acquireQueued()" style="rhombus;whiteSpace=wrap;html=1;rounded=0;" parent="1" vertex="1">
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<mxGeometry relative="1" as="geometry" />
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<mxCell id="zObkzzUAoMXtNydKvx5d-120" value="添加新节点<br>#addWaiter" style="whiteSpace=wrap;html=1;rounded=0;" parent="1" vertex="1">
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<mxCell id="zObkzzUAoMXtNydKvx5d-20" value="tryAcquire" style="shape=umlFrame;whiteSpace=wrap;html=1;" parent="tJKFbUdxLd3i8MNqsO-P-9" vertex="1">
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<mxCell id="zObkzzUAoMXtNydKvx5d-21" value="通过cas修改state的值" style="rhombus;whiteSpace=wrap;html=1;rounded=0;" parent="tJKFbUdxLd3i8MNqsO-P-8" vertex="1">
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<mxCell id="zObkzzUAoMXtNydKvx5d-15" value="state等于0？" style="rhombus;whiteSpace=wrap;html=1;rounded=0;" parent="tJKFbUdxLd3i8MNqsO-P-7" vertex="1">
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<mxCell id="zObkzzUAoMXtNydKvx5d-17" value="独占线程为当前线程？" style="rhombus;whiteSpace=wrap;html=1;rounded=0;" parent="tJKFbUdxLd3i8MNqsO-P-7" vertex="1">
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<mxCell id="zObkzzUAoMXtNydKvx5d-30" value="锁定计数加1，修改state的值为锁定计数，获取锁成功" style="whiteSpace=wrap;html=1;rounded=0;" parent="tJKFbUdxLd3i8MNqsO-P-7" vertex="1">
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<mxCell id="zObkzzUAoMXtNydKvx5d-59" value="" style="edgeStyle=orthogonalEdgeStyle;html=1;verticalAlign=bottom;endArrow=open;endSize=8;rounded=0;" parent="tJKFbUdxLd3i8MNqsO-P-11" source="zObkzzUAoMXtNydKvx5d-58" edge="1">
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</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-60" value="根据当前线程<br>创建一个新节点" style="html=1;labelBackgroundColor=none;container=0;" parent="tJKFbUdxLd3i8MNqsO-P-11" vertex="1">
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</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-63" value="尾节点不为空" style="rhombus;whiteSpace=wrap;html=1;labelBackgroundColor=none;container=0;" parent="tJKFbUdxLd3i8MNqsO-P-11" vertex="1">
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<mxGeometry relative="1" as="geometry" />
</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-65" value="将新节点插入队列<br>#enq" style="whiteSpace=wrap;html=1;labelBackgroundColor=none;container=0;" parent="tJKFbUdxLd3i8MNqsO-P-11" vertex="1">
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<mxCell id="zObkzzUAoMXtNydKvx5d-77" value="为空" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];container=0;" parent="zObkzzUAoMXtNydKvx5d-66" vertex="1" connectable="0">
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<mxGeometry relative="1" as="geometry" />
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<mxCell id="zObkzzUAoMXtNydKvx5d-71" value="将tail指向新节点" style="rhombus;whiteSpace=wrap;html=1;labelBackgroundColor=none;container=0;" parent="tJKFbUdxLd3i8MNqsO-P-11" vertex="1">
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<mxCell id="zObkzzUAoMXtNydKvx5d-75" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;" parent="tJKFbUdxLd3i8MNqsO-P-11" source="zObkzzUAoMXtNydKvx5d-73" target="zObkzzUAoMXtNydKvx5d-65" edge="1">
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<mxCell id="zObkzzUAoMXtNydKvx5d-73" value="将原尾节点的下一个节点指向新节点" style="whiteSpace=wrap;html=1;labelBackgroundColor=none;container=0;" parent="tJKFbUdxLd3i8MNqsO-P-11" vertex="1">
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<mxCell id="zObkzzUAoMXtNydKvx5d-74" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;" parent="tJKFbUdxLd3i8MNqsO-P-11" source="zObkzzUAoMXtNydKvx5d-71" target="zObkzzUAoMXtNydKvx5d-73" edge="1">
<mxGeometry relative="1" as="geometry" />
</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-92" value="赋值成功" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];container=0;" parent="zObkzzUAoMXtNydKvx5d-74" vertex="1" connectable="0">
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<mxCell id="zObkzzUAoMXtNydKvx5d-81" value="" style="ellipse;html=1;shape=startState;labelBackgroundColor=none;container=0;" parent="tJKFbUdxLd3i8MNqsO-P-11" vertex="1">
<mxGeometry x="636" y="149" width="30" height="30" as="geometry" />
</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-82" value="" style="edgeStyle=orthogonalEdgeStyle;html=1;verticalAlign=bottom;endArrow=open;endSize=8;rounded=0;" parent="tJKFbUdxLd3i8MNqsO-P-11" source="zObkzzUAoMXtNydKvx5d-81" edge="1">
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</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-86" value="尾节点为空" style="rhombus;whiteSpace=wrap;html=1;labelBackgroundColor=none;container=0;" parent="tJKFbUdxLd3i8MNqsO-P-11" vertex="1">
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</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-100" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.001;entryY=0.496;entryDx=0;entryDy=0;entryPerimeter=0;" parent="tJKFbUdxLd3i8MNqsO-P-11" source="zObkzzUAoMXtNydKvx5d-88" target="zObkzzUAoMXtNydKvx5d-86" edge="1">
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<mxCell id="zObkzzUAoMXtNydKvx5d-102" value="初始化失败" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];container=0;" parent="zObkzzUAoMXtNydKvx5d-100" vertex="1" connectable="0">
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<mxCell id="zObkzzUAoMXtNydKvx5d-88" value="初始化头节点<br>（new一个虚拟节点）" style="rhombus;whiteSpace=wrap;html=1;labelBackgroundColor=none;container=0;" parent="tJKFbUdxLd3i8MNqsO-P-11" vertex="1">
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</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-89" value="为空" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;" parent="tJKFbUdxLd3i8MNqsO-P-11" source="zObkzzUAoMXtNydKvx5d-86" target="zObkzzUAoMXtNydKvx5d-88" edge="1">
<mxGeometry relative="1" as="geometry" />
</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-99" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0.007;entryY=0.492;entryDx=0;entryDy=0;entryPerimeter=0;" parent="tJKFbUdxLd3i8MNqsO-P-11" source="zObkzzUAoMXtNydKvx5d-96" target="zObkzzUAoMXtNydKvx5d-86" edge="1">
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<mxPoint x="470" y="251" />
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</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-96" value="头节点和尾节点指向虚拟节点" style="whiteSpace=wrap;html=1;labelBackgroundColor=none;container=0;" parent="tJKFbUdxLd3i8MNqsO-P-11" vertex="1">
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</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-97" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;" parent="tJKFbUdxLd3i8MNqsO-P-11" source="zObkzzUAoMXtNydKvx5d-88" target="zObkzzUAoMXtNydKvx5d-96" edge="1">
<mxGeometry relative="1" as="geometry" />
</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-98" value="初始化成功" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];container=0;" parent="zObkzzUAoMXtNydKvx5d-97" vertex="1" connectable="0">
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<mxPoint as="offset" />
</mxGeometry>
</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-103" value="新节点的前节点<br>指向尾节点" style="whiteSpace=wrap;html=1;labelBackgroundColor=none;container=0;" parent="tJKFbUdxLd3i8MNqsO-P-11" vertex="1">
<mxGeometry x="809" y="221.5" width="120" height="60" as="geometry" />
</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-104" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;" parent="tJKFbUdxLd3i8MNqsO-P-11" source="zObkzzUAoMXtNydKvx5d-86" target="zObkzzUAoMXtNydKvx5d-103" edge="1">
<mxGeometry relative="1" as="geometry" />
</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-105" value="不为空" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];container=0;" parent="zObkzzUAoMXtNydKvx5d-104" vertex="1" connectable="0">
<mxGeometry x="-0.201" relative="1" as="geometry">
<mxPoint as="offset" />
</mxGeometry>
</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-111" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;entryX=0;entryY=0.494;entryDx=0;entryDy=0;entryPerimeter=0;" parent="tJKFbUdxLd3i8MNqsO-P-11" source="zObkzzUAoMXtNydKvx5d-106" target="zObkzzUAoMXtNydKvx5d-86" edge="1">
<mxGeometry relative="1" as="geometry">
<Array as="points">
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</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-113" value="修改失败" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];container=0;" parent="zObkzzUAoMXtNydKvx5d-111" vertex="1" connectable="0">
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<mxPoint as="offset" />
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</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-106" value="将tail指向新节点" style="rhombus;whiteSpace=wrap;html=1;labelBackgroundColor=none;container=0;" parent="tJKFbUdxLd3i8MNqsO-P-11" vertex="1">
<mxGeometry x="819" y="318" width="100" height="68" as="geometry" />
</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-107" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;" parent="tJKFbUdxLd3i8MNqsO-P-11" source="zObkzzUAoMXtNydKvx5d-103" target="zObkzzUAoMXtNydKvx5d-106" edge="1">
<mxGeometry relative="1" as="geometry" />
</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-108" value="原来尾节点的下一个节点指向新节点，返回原来尾节点" style="whiteSpace=wrap;html=1;labelBackgroundColor=none;container=0;" parent="tJKFbUdxLd3i8MNqsO-P-11" vertex="1">
<mxGeometry x="809" y="462" width="120" height="60" as="geometry" />
</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-109" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;" parent="tJKFbUdxLd3i8MNqsO-P-11" source="zObkzzUAoMXtNydKvx5d-106" target="zObkzzUAoMXtNydKvx5d-108" edge="1">
<mxGeometry relative="1" as="geometry" />
</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-110" value="修改成功" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];container=0;" parent="zObkzzUAoMXtNydKvx5d-109" vertex="1" connectable="0">
<mxGeometry x="-0.0842" y="2" relative="1" as="geometry">
<mxPoint as="offset" />
</mxGeometry>
</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-117" value="返回新节点" style="whiteSpace=wrap;html=1;labelBackgroundColor=none;container=0;" parent="tJKFbUdxLd3i8MNqsO-P-11" vertex="1">
<mxGeometry x="235.5" y="628" width="120" height="60" as="geometry" />
</mxCell>
<mxCell id="zObkzzUAoMXtNydKvx5d-118" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;" parent="tJKFbUdxLd3i8MNqsO-P-11" source="zObkzzUAoMXtNydKvx5d-65" target="zObkzzUAoMXtNydKvx5d-117" edge="1">
<mxGeometry relative="1" as="geometry" />
</mxCell>
<mxCell id="tJKFbUdxLd3i8MNqsO-P-18" value="" style="ellipse;html=1;shape=startState;fillColor=#000000;strokeColor=#ff0000;rounded=0;sketch=0;" vertex="1" parent="1">
<mxGeometry x="375" y="1151" width="30" height="30" as="geometry" />
</mxCell>
<mxCell id="tJKFbUdxLd3i8MNqsO-P-19" value="" style="edgeStyle=orthogonalEdgeStyle;html=1;verticalAlign=bottom;endArrow=open;endSize=8;strokeColor=#ff0000;rounded=1;sketch=0;curved=0;" edge="1" source="tJKFbUdxLd3i8MNqsO-P-18" parent="1">
<mxGeometry relative="1" as="geometry">
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</mxCell>
<mxCell id="tJKFbUdxLd3i8MNqsO-P-20" value="Object" style="html=1;rounded=0;sketch=0;" vertex="1" parent="1">
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