[jira] [Updated] (PROTON-30) The driver cannot be cleanly used in a multi-threaded application due to pn_driver_wait

["Rafael H. Schloming (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PROTON-30?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rafael H. Schloming updated PROTON-30:
--------------------------------------

    Assignee: Ted Ross
    
> The driver cannot be cleanly used in a multi-threaded application due to pn_driver_wait
> ---------------------------------------------------------------------------------------
>
>                 Key: PROTON-30
>                 URL: https://issues.apache.org/jira/browse/PROTON-30
>             Project: Qpid Proton
>          Issue Type: Wish
>          Components: proton-c
>            Reporter: Ted Ross
>            Assignee: Ted Ross
>
> An efficient multi-threaded application based on proton-c will want to have one thread blocked on pn_driver_wait if there's no other work for it to do.  Unfortunately, pn_driver_wait does thread-unsafe things with internal driver data structures before and after it blocks on the FD set.
> The alternatives are to quiesce all threads prior to calling pn_driver_wait (which is undesirable for performance reasons) or to divide pn_driver_wait into three sections, the first and third of which can be invoked with a lock held and the second of which (the poll call) can be invoked without a lock.
> Alternatively, a driver API better suited to multi-threading could be developed.

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