Java程式問題定位時線程棧資訊是一個重要線索,如下圖:
“Thread-1” prio=6 tid=0x05b84800 nid=0x660 waiting for monitor entry [0x063bf000]
java.lang.Thread.State:Blocked (on object monitor)
at com.road.threadDead.ThreadDead.run(ThreadDead.java:40)
-waiting to lock<0x29617b0>(a java.lang.Object)
-locked<0x29e617b8>(a java.lang.Object)
at java.lang.Thread.run(Thread.java:724)
Locked ownable synchronizers
-None
“Thread-0” prio=6 tid=0x05b84000 nid=0xfb8 waiting for monitor entry[0x0613f000]
java lang.Thread.State:BLOCKED(on object monitor)
at com.road.threadDead.ThreadDead.run(ThreadDead.java:29)
-waiting to lock <0x29e617b8>(a java.lang.Object)
-locked <0x29e617b0>( a java.lang.Object)
at java.lang.Thread.run(Thread.java:724)
Locked ownable synchronize
-None
Thread-1:是線程名稱。
tid:Java的線程ID。
nid:每一個Java線程在作業系統層面都與一個線程對應,這個線程ID就是nid。
prio:線程優先級。
waiting for monitor entry[0x063bf000]:等待擷取對象鎖,而這個對象正好由thread-0所持有,是以這兩個線程實際上是互鎖,也就是死鎖。
[0x063bf000]:線程棧起始位址。