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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5691) Remove SimpleCondition
Date Tue, 25 Jun 2013 05:50:20 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13692770#comment-13692770
] 

Jonathan Ellis commented on CASSANDRA-5691:
-------------------------------------------

bq. If the patch is not applied then at least singnal() invocations should be replaced with
signalAll() and signal() should throw UnsupportedOperationException.

Agreed.
                
> Remove SimpleCondition
> ----------------------
>
>                 Key: CASSANDRA-5691
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5691
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Mikhail Mazursky
>            Priority: Minor
>         Attachments: trunk-5691.patch
>
>
> Problematic scenario:
> 1. two threads get blocked in SimpleCondition.await();
> 2. some thread calls SimpleCondition.signal();
> 3. one of blocked threads wakes up and runs;
> 4. spurious wakeup happens in the second thread and it wakes up too and runs even though
nobody signaled it.
> Thus this is a broken implementation of Condition interface.
> Anyway, looking at how code uses it, SimpleCondition can just be replaced with CountDownLatch.

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