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From "Pierre De Rop (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (FELIX-5178) Make some component parameters as volatile
Date Sun, 06 Mar 2016 19:07:40 GMT

     [ https://issues.apache.org/jira/browse/FELIX-5178?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Pierre De Rop closed FELIX-5178.

> Make some component parameters as volatile
> ------------------------------------------
>                 Key: FELIX-5178
>                 URL: https://issues.apache.org/jira/browse/FELIX-5178
>             Project: Felix
>          Issue Type: Bug
>          Components: Dependency Manager, Dependency Manager Lambda
>    Affects Versions: org.apache.felix.dependencymanager-r1
>            Reporter: Pierre De Rop
>            Assignee: Pierre De Rop
>             Fix For: org.apache.felix.dependencymanager-r8
> Currently, all parameters passed to components/dependencies API are stored in non volatile
variables, because internally,  we are using a concurrent queue, which ensures "safe publication"
regarding memory visibility.
> Now, this is all fine, except for the following case:
> - The application creates and initialize a Component from one thread T1.
> - Then later, from thread T2, the application starts the component (adds it to a DependencyManager
> In this case, we should declare all API parameters in volatile attributes in order to
ensure safe visibility from T2 thread, when accessing to parameters that were set in the original
T1 thread.

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