Re: [Boost-bugs] [Boost C++ Libraries] #7668: thread_group::join_all() should check whether its threads are joinable

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #7668: thread_group::join_all() should check whether its threads are joinable
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2013-01-10 19:51:52

#7668: thread_group::join_all() should check whether its threads are joinable
------------------------------------+---------------------------------------
  Reporter:  boost.lists@…          |       Owner:  viboes             
      Type:  Bugs                   |      Status:  closed             
 Milestone:  Boost 1.53.0           |   Component:  thread             
   Version:  Boost 1.52.0           |    Severity:  Problem            
Resolution:  fixed                  |    Keywords:  thread;thread_group
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Comment (by Andrew Molyneux <andrew.molyneux@…>):

 > No. I thread that finish normally is still joinable. From where are you
 deducing this?
 I thought I'd observed it, but on further investigation the situation is a
 bit more complex. My code is actually using thread::timed_join()
 periodically, to check if the thread is still running. I've distilled it
 down to the following code, which triggers the behaviour that surprised
 me:
 {{{#!C++
 void threadFunction()
 {
   boost::this_thread::sleep(boost::posix_time::millisec(100));
 }

 int main(int argc, char* argv[])
 {
   boost::thread theThread(threadFunction);
   // Wait long enough to be fairly certain that the thread has finished
   boost::this_thread::sleep(boost::posix_time::millisec(200));
   if (!theThread.timed_join(boost::posix_time::millisec(0)))
   {
     cout << "Thread still running???" << endl;
     return 1;
   }
   theThread.join();
 }
 }}}

 When I run that code, I get an exception on the call to theThread.join(),
 complaining that the thread is not joinable. It seems that after
 theThread.timed_join() succeeds, the thread is no longer joinable. Is this
 the expected behaviour?

 By the way, my environment is Windows 7 64-bit, but 32-bit Boost, with
 Visual Studio 2005 and Boost 1.52.0).

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7668#comment:10>
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