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からスレッド ダンプを取得しましたjstack。2 つのスレッドが同じオブジェクトでロックされていることを示していますlocked <0x00000000c0313ce0>。jstack が最初のスレッドのスタック トレースを同じ時点ではなく、2 番目のスレッドのスタック トレースを取得したときに表示する状況はありますか? または、そのようなロック状況の原因として他に何が考えられますか?

"Thread-1" #44 prio=5 os_prio=0 tid=0x000000001c418800 nid=0x922c in Object.wait() [0x0000000018ffe000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    at org.h2.mvstore.db.MVTable.doLock1(MVTable.java:242)
    at org.h2.mvstore.db.MVTable.lock(MVTable.java:167)
    - locked <0x00000000c0313ce0> (a org.h2.engine.Database)
    at org.h2.engine.Database.lockMeta(Database.java:896)
    at org.h2.engine.Database.removeMeta(Database.java:919)
    - locked <0x00000000c0313ce0> (a org.h2.engine.Database)
    at org.h2.table.Table.removeChildrenAndResources(Table.java:525)
    at org.h2.mvstore.db.MVTable.removeChildrenAndResources(MVTable.java:799)
    at org.h2.engine.Session.cleanTempTables(Session.java:830)
    - locked <0x00000000c0313ce0> (a org.h2.engine.Database)
    at org.h2.engine.Session.close(Session.java:708)
    at org.h2.engine.Database.closeAllSessionsException(Database.java:1186)
    - locked <0x00000000c0313ce0> (a org.h2.engine.Database)
    at org.h2.engine.Database.close(Database.java:1224)
    - locked <0x00000000c0313ce0> (a org.h2.engine.Database)
    at org.h2.engine.DatabaseCloser.run(DatabaseCloser.java:63)

"Resource Destroyer in BasicResourcePool.close()" #110 daemon prio=5 os_prio=0 tid=0x000000001c41a000 nid=0x2d44 in Object.wait() [0x000000001b6ae000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    at org.h2.mvstore.db.MVTable.doLock1(MVTable.java:242)
    at org.h2.mvstore.db.MVTable.lock(MVTable.java:167)
    - locked <0x00000000c0313ce0> (a org.h2.engine.Database)
    at org.h2.engine.Database.lockMeta(Database.java:896)
    at org.h2.engine.Database.removeMeta(Database.java:919)
    - locked <0x00000000c0313ce0> (a org.h2.engine.Database)
    at org.h2.table.Table.removeChildrenAndResources(Table.java:525)
    at org.h2.mvstore.db.MVTable.removeChildrenAndResources(MVTable.java:799)
    at org.h2.engine.Session.cleanTempTables(Session.java:830)
    - locked <0x00000000c0313ce0> (a org.h2.engine.Database)
    at org.h2.engine.Session.close(Session.java:708)
    at org.h2.jdbc.JdbcConnection.close(JdbcConnection.java:383)
    - locked <0x00000000ede38ce0> (a org.h2.engine.Session)
    - locked <0x00000000ede37708> (a org.h2.jdbc.JdbcConnection)
    at com.mchange.v2.c3p0.impl.NewPooledConnection.close(NewPooledConnection.java:642)
    at com.mchange.v2.c3p0.impl.NewPooledConnection.closeMaybeCheckedOut(NewPooledConnection.java:255)
    - locked <0x00000000ee186430> (a com.mchange.v2.c3p0.impl.NewPooledConnection)
    at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.destroyResource(C3P0PooledConnectionPool.java:621)
    - locked <0x00000000ee186490> (a java.lang.Object)
    at com.mchange.v2.resourcepool.BasicResourcePool$1DestroyResourceTask.run(BasicResourcePool.java:1065)
    at com.mchange.v2.resourcepool.BasicResourcePool.destroyResource(BasicResourcePool.java:1090)
    at com.mchange.v2.resourcepool.BasicResourcePool.destroyResource(BasicResourcePool.java:1051)
    at com.mchange.v2.resourcepool.BasicResourcePool.access$100(BasicResourcePool.java:44)
    at com.mchange.v2.resourcepool.BasicResourcePool$5.run(BasicResourcePool.java:1305)
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1 に答える 1

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これらのスレッド 2 はオブジェクトがロックされていません。どちらもo.wait()同じ object の呼び出しを待機していますo。

o.wait()最初に object のロックを解放することを思い出してくださいo。次に、他のスレッドがオブジェクトに通知するのを待ち、ロックを再取得してから呼び出し元に戻ります。

于 2016-01-18T15:48:01.907 に答える