目前我们正在分析 tomcat 线程转储。同时运行的所有线程的单个线程转储
tomcat 上的时间包含以下几行:
...
"soldOutJmsConsumerContainer-1" prio=10 tid=0x00007f8409c14800 nid=0x231 in Object.wait() [0x00007f8403a9f000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:485)
at com.tc.object.RemoteObjectManagerImpl.waitUntilRunning(RemoteObjectManagerImpl.java:150)
at com.tc.object.RemoteObjectManagerImpl.basicRetrieve(RemoteObjectManagerImpl.java:216)
- locked <0x00007f847612c820> (a com.tc.object.RemoteObjectManagerImpl)
...
"catalina-exec-33" daemon prio=10 tid=0x0000000041bc4000 nid=0x832 in Object.wait() [0x00007f8400f73000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:485)
at com.tc.object.RemoteObjectManagerImpl.waitUntilRunning(RemoteObjectManagerImpl.java:150)
at com.tc.object.RemoteObjectManagerImpl.basicRetrieve(RemoteObjectManagerImpl.java:216)
- locked <0x00007f847612c820> (a com.tc.object.RemoteObjectManagerImpl)
...
"catalina-exec-109" daemon prio=10 tid=0x0000000041469800 nid=0x1e87 in Object.wait() [0x00007f83f84c1000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:485)
at com.tc.object.RemoteObjectManagerImpl.waitUntilRunning(RemoteObjectManagerImpl.java:150)
at com.tc.object.RemoteObjectManagerImpl.basicRetrieve(RemoteObjectManagerImpl.java:216)
- locked <0x00007f847612c820> (a com.tc.object.RemoteObjectManagerImpl)
我们尤其不明白
- locked <0x00007f847612c820> (a com.tc.object.RemoteObjectManagerImpl)
根据我们的理解,它表示三个线程当时持有同一个监视器的锁。在我们的理解中
并根据JLS这不可能。
我们对线程转储的解释正确吗?
看起来所有这些线程都在等待与监视器相关的条件,即它们调用wait()
该监视器的方法。
当线程调用时wait()
在它拥有的监视器上,它临时释放监视器并需要在从wait()
。因此,您可以拥有多个曾经拥有监视器但现在正在等待的线程wait()
method.
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