Re: [Boost-bugs] [Boost C++ Libraries] #5351: interrupt a future get boost::unknown_exception

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #5351: interrupt a future get boost::unknown_exception
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-12-11 01:27:28

#5351: interrupt a future get boost::unknown_exception
--------------------------------------------+-------------------------------
  Reporter:  qiaozhiqiang@…                 |       Owner:  viboes                                     
      Type:  Bugs                           |      Status:  assigned                                   
 Milestone:  To Be Determined               |   Component:  thread                                     
   Version:  Boost 1.46.0                   |    Severity:  Problem                                    
Resolution:                                 |    Keywords:  thread interrupt  future  unknown_exception
--------------------------------------------+-------------------------------

Comment (by viboes):

 I have reached to compile the example with some variants.

 It seems the problem comes from the fact that packaged_task catch every
 exception and store it to rethrow in the wait() function using
 boost::rethrow_exception. As thread_interrupted doesn't inherits from
 std/boost::exception the throw exception is unknown_exception.




 {{{
                 if(rethrow && exception)
                 {
                     boost::rethrow_exception(exception);
                 }
 }}}

 A solution could be to catch specifically thread_interrupted and store
 this fact.

 When wait is called, a test if the thread has been interrupted is done so
 that the exception thread_interrupted is thrown. The single problem is
 that the this new exception doesn't contains from where the initial
 thread_interrupted was thrown.

 See the attached patch for the complete solution.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/5351#comment:2>
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