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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 52213] New: Field "org.apache.catalina.tribes.transport.bio.util.FastQueue.enabled" should be volatile.
Date Fri, 18 Nov 2011 23:29:32 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=52213

             Bug #: 52213
           Summary: Field
                    "org.apache.catalina.tribes.transport.bio.util.FastQue
                    ue.enabled" should be volatile.
           Product: Tomcat 7
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Catalina
        AssignedTo: dev@tomcat.apache.org
        ReportedBy: reprogrammer@gmail.com
    Classification: Unclassified


The boolean flag
"org.apache.catalina.tribes.transport.bio.util.FastQueue.enabled" may be
read/written by multiple threads concurrently (See
<http://svn.apache.org/repos/asf/!svn/bc/1203897/tomcat/trunk/java/org/apache/catalina/tribes/group/interceptors/MessageDispatchInterceptor.java>).
Therefore, accesses to it should be properly synchronized. It is sufficient to
make this boolean flag volatile to protect access to it.

See
<https://www.securecoding.cert.org/confluence/display/java/VNA00-J.+Ensure+visibility+when+accessing+shared+primitive+variables>
for more information about this bug pattern.

Keshmesh (https://keshmesh.cs.illinois.edu/) is an Eclipse plugin that
analyzes the source code of Java programs for common concurrency bug patterns.
We used Keshmesh to detect this concurrency bug pattern.

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