Ted Ross created PROTON-30:
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             Summary: 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


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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