Re: [Boost-bugs] [Boost C++ Libraries] #4345: thread::id and joining problem with cascade of threads

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #4345: thread::id and joining problem with cascade of threads
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2010-06-16 03:25:47

#4345: thread::id and joining problem with cascade of threads
----------------------------------------------------------+-----------------
 Reporter:  bartek szurgot <bartosz.szurgot@…>            |       Owner:  anthonyw
     Type:  Bugs                                          |      Status:  new     
Milestone:  Boost 1.43.0                                  |   Component:  thread  
  Version:  Boost 1.43.0                                  |    Severity:  Problem 
 Keywords:                                                |  
----------------------------------------------------------+-----------------

Comment(by steven_watanabe):

 This code is very hard to follow, but here's what's happening in detail:

 - An object of type B is created
  - This creates a shared_ptr with a new A object
   - The new A object starts thread A
 - Thread B is created, and receives a copy of the B object, this copy is
 not
   destroyed until the last thread::id for this thread is gone.
 - Thread B runs to completion and is joined.  The last copy of B has not
 yet
   been destroyed, so there is no attempt to join thread A.
 - Kaboom.

 I don't think this should be considered a bug in the library.  If you want
 to join another thread when a thread exits, join at the end of the thread
 function instead of in the destructor.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/4345#comment:2>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.