[jboss-jira] [JBoss JIRA] Created: (JBREM-766) Guard against "spurious wakeup" from Thread.sleep()

[Ron Sigal (JIRA)]

Guard against "spurious wakeup" from Thread.sleep()
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                 Key: JBREM-766
                 URL: http://jira.jboss.com/jira/browse/JBREM-766
             Project: JBoss Remoting
          Issue Type: Bug
      Security Level: Public (Everyone can see)
    Affects Versions: 2.4.0.Beta1 (Pinto)
            Reporter: Ron Sigal
         Assigned To: Ron Sigal
             Fix For: 2.4.0.Beta1 (Pinto)


The jdk 1.5 javadoc for java.lang.Object (but not the jdk 1.4 javadoc) notes:

A thread can also wake up without being notified, interrupted, or timing out, a so-called spurious wakeup. While this will rarely occur in practice, applications must guard against it by testing for the condition that should have caused the thread to be awakened, and continuing to wait if the condition is not satisfied. In other words, waits should always occur in loops, like this one:

     synchronized (obj) {
         while (<condition does not hold>)
             obj.wait(timeout);
         ... // Perform action appropriate to condition
     }
 

(For more information on this topic, see Section 3.2.3 in Doug Lea's "Concurrent Programming in Java (Second Edition)" (Addison-Wesley, 2000), or Item 50 in Joshua Bloch's "Effective Java Programming Language Guide" (Addison-Wesley, 2001).

We should make sure all calls to Thread.wait() are handled appropriately.

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