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  1. JDK
  2. JDK-4785530

getMixerInfo: uncompleted execution due to waiting thread

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      Name: dkR10031 Date: 11/27/2002


       
      After AudioSystem.getMixerInfo() method invocation, a thread which waits
      for notification does not allow to complete class execution.
      The JDK 2 SE 1.4 API specification does not state what should
      notify the thread created or used by AudioSystem.getMixerInfo():

        "getMixerInfo
       
        public static Mixer.Info[] getMixerInfo()
       
            Obtains an array of mixer info objects that represents the set of
        audio mixers that are currently installed on the system.
       
        Returns:
        an array of info objects for the currently installed mixers. If no mixers
        are available on the system, an array of length 0 is returned."
       
      The bug is found in JDK build 1.4.2-beta-b07, and reproduced with
      JDK 1.3.0, JDK 1.3.1, JDK 1.4.0, JDK 1.4.1 and all JDK 1.4.2-beta builds.
      To reproduce the bug run the following test with JDK build 1.4.2-beta-b07,
      wait for 3 minutes and press ctrl+\:
      ------------------------------------------------------------------------
      import javax.sound.sampled.*;
      public class MyMusic{
          public static void main(String args[]){
              System.out.println("We are trying to get informations:");
              Mixer.Info[] mixerInfo = AudioSystem.getMixerInfo();
              System.out.println("The movie is over! Where is exit?");
          }
      }
      -----------------------------Logs---------------------------------------
      We are trying to get informations:
      The movie is over! Where is exit?
      Full thread dump Java HotSpot(TM) Client VM (1.4.2-beta-b07 mixed mode):

      "DestroyJavaVM" prio=1 tid=0x08052f50 nid=0x5246 waiting on condition
      [0..bfffd4
      7c]

      "Java Sound event dispatcher" prio=1 tid=0x0810c188 nid=0x524f in
      Object.wait()
      [4cf22000..4cf228b8]
              at java.lang.Object.wait(Native Method)
              - waiting on <0x446c2e70> (a com.sun.media.sound.EventDispatcher)
              at java.lang.Object.wait(Object.java:426)
              at
      com.sun.media.sound.EventDispatcher.dispatchEvents(EventDispatcher.ja
      va:292)
              - locked <0x446c2e70> (a com.sun.media.sound.EventDispatcher)
              at
      com.sun.media.sound.EventDispatcher.run(EventDispatcher.java:343)
              at java.lang.Thread.run(Thread.java:536)

      "Signal Dispatcher" daemon prio=1 tid=0x0809ffe0 nid=0x524c waiting on
      condition
       [0..0]

      "Finalizer" daemon prio=1 tid=0x0808b310 nid=0x524a in Object.wait()
      [4c874000..
      4c8748b8]
              at java.lang.Object.wait(Native Method)
              - waiting on <0x44690490> (a java.lang.ref.ReferenceQueue$Lock)
              at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:111)
              - locked <0x44690490> (a java.lang.ref.ReferenceQueue$Lock)
              at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:127)
              at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)

      "Reference Handler" daemon prio=1 tid=0x0808a6c0 nid=0x5249 in
      Object.wait() [4c
      7f3000..4c7f38b8]
              at java.lang.Object.wait(Native Method)
              - waiting on <0x44690380> (a java.lang.ref.Reference$Lock)
              at java.lang.Object.wait(Object.java:426)
              at
      java.lang.ref.Reference$ReferenceHandler.run(Reference.java:113)
              - locked <0x44690380> (a java.lang.ref.Reference$Lock)

      "VM Thread" prio=1 tid=0x080874a0 nid=0x5248 runnable

      "VM Periodic Task Thread" prio=1 tid=0x080a26f8 nid=0x524e waiting on
      condition
      "Suspend Checker Thread" prio=1 tid=0x0809f5f8 nid=0x524b runnable
      -------------------------------------------------------------------------

      ======================================================================

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              Assignee:
              fbomerssunw Florian Bomers (Inactive)
              Reporter:
              dimasunw Dima Dima (Inactive)
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