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Thread: Two threads waiting on a object Monitor

  1. #1
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    Default Two threads waiting on a object Monitor

    Hi,

    Two threads seems to be in WAITING indefinately(VisualVM shows 100% Waiting)..
    The following is a block from thread dump


    "EventWriter-2" daemon prio=10 tid=0x00007f7764b54800 nid=0x33c5 in Object.wait() [0x00007f7762442000]
    java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    - waiting on <0x00000006895bc720> (a it.gotoandplay.smartfoxserver.lib.ChannelQueue)
    at java.lang.Object.wait(Object.java:502)
    at it.gotoandplay.smartfoxserver.lib.ChannelQueue.deQ ueue(ChannelQueue.java:51)
    - locked <0x00000006895bc720> (a it.gotoandplay.smartfoxserver.lib.ChannelQueue)
    at it.gotoandplay.smartfoxserver.EventWriter.run(Even tWriter.java:73)
    at java.lang.Thread.run(Thread.java:636)

    Locked ownable synchronizers:
    - None

    "EventWriter-1" daemon prio=10 tid=0x00007f7764324800 nid=0x33c4 in Object.wait() [0x00007f7762543000]
    java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    - waiting on <0x00000006895bc720> (a it.gotoandplay.smartfoxserver.lib.ChannelQueue)
    at java.lang.Object.wait(Object.java:502)
    at it.gotoandplay.smartfoxserver.lib.ChannelQueue.deQ ueue(ChannelQueue.java:51)
    - locked <0x00000006895bc720> (a it.gotoandplay.smartfoxserver.lib.ChannelQueue)
    at it.gotoandplay.smartfoxserver.EventWriter.run(Even tWriter.java:73)
    at java.lang.Thread.run(Thread.java:636)

    Locked ownable synchronizers:
    - None

    These are the only 2 threads that are accessing the corresponsing object.

    Can 2 threads waiting on same object monitor ?.
    Can somebody help with what could be the issue here and what should be done ?

    Thanks..


  2. #2
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    Default Re: Two threads waiting on a object Monitor

    We can't really help you without an SSCCE that demonstrates the problem.
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