NIO[SelectableChannel.register和Selector.select会有锁等待冲突]-白红宇

NIO[SelectableChannel.register和Selector.select会有锁等待冲突]

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发布时间：2019-05-26

本文共 2979 字，大约阅读时间需要 9 分钟。

结论： register得放在select之前进行

Thread Dump信息：

"Poller-1" prio=6 tid=0x040f0400 nid=0x408 runnable [0x044df000]

java.lang.Thread.State: RUNNABLE

at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)

at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(WindowsSelectorImpl.j

ava:295)

at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(WindowsSelector

Impl.java:277)

at sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:158)

at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)

- locked <0x23b7df70> (a sun.nio.ch.Util$2)

- locked <0x23b7df60> (a java.util.Collections$UnmodifiableSet)

- locked <0x23b7dd40> (a sun.nio.ch.WindowsSelectorImpl)

at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)

at com.zhh.nio.NioServer$Poller.run(NioServer.java:132)

at java.lang.Thread.run(Thread.java:722)

"Poller-0" prio=6 tid=0x040f0000 nid=0x14e4 runnable [0x0439f000]

java.lang.Thread.State: RUNNABLE

at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)

at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(WindowsSelectorImpl.j

ava:295)

at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(WindowsSelector

Impl.java:277)

at sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:158)

at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)

- locked <0x23b77a98> (a sun.nio.ch.Util$2)

- locked <0x23b77a20> (a java.util.Collections$UnmodifiableSet)

- locked <0x23b76aa0> (a sun.nio.ch.WindowsSelectorImpl)

at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)

at com.zhh.nio.NioServer$Poller.run(NioServer.java:132)

at java.lang.Thread.run(Thread.java:722)

"Acceptor" prio=6 tid=0x040ef800 nid=0x1250 waiting for monitor entry [0x03f1f00

java.lang.Thread.State: BLOCKED (on object monitor)

at sun.nio.ch.SelectorImpl.register(SelectorImpl.java:133)

waiting to lock <0x23b7df60> (a java.util.Collections$UnmodifiableSet)

at java.nio.channels.spi.AbstractSelectableChannel.register(AbstractSele

ctableChannel.java:207)

- locked <0x23b8da18> (a java.lang.Object)

at java.nio.channels.SelectableChannel.register(SelectableChannel.java:2

77)

at com.zhh.nio.NioSession.register(NioSession.java:50)

at com.zhh.nio.NioServer$Poller.register(NioServer.java:123)

at com.zhh.nio.NioServer.handleNewSession(NioServer.java:222)

at com.zhh.nio.NioServer$Acceptor.run(NioServer.java:236)

at java.lang.Thread.run(Thread.java:722)

Code层面：

select：

private int lockAndDoSelect(long timeout) throws IOException {

synchronized (this) {

if (!isOpen())

throw new ClosedSelectorException();

synchronized (publicKeys) {

synchronized (publicSelectedKeys) {

return doSelect(timeout);

}

protected final SelectionKey register(AbstractSelectableChannel ch,

int ops,

Object attachment)

{

if (!(ch instanceof SelChImpl))

throw new IllegalSelectorException();

SelectionKeyImpl k = new SelectionKeyImpl((SelChImpl)ch, this);

k.attach(attachment);

synchronized (publicKeys) {

implRegister(k);

}

k.interestOps(ops);

return k;

}

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