[Boost-users] thread: not joinable?

From: Robert Marion (rob_marion1_at_[hidden])
Date: 2006-11-21 16:10:50

Hi,
I've written my first boost::thread application, and I
get this assertion:
/boost_1_33_1/libs/thread/src/thread.cpp:223: void
boost::thread::join(): Assertion 'm_joinable' failed.

I call the thread as:

void _pollMode( Controller& ctrl )  {
   // do polling ... for my testing, left blank
}

void SomeClass::startPolling()  {
   m_pCtrl = new Controller;
   boost::function<void (Controller&)> funcPoll;
   funcPoll = &_pollMode;
   m_thr = new boost:thread(boost::bind( funcPoll,
*m_pCtrl));
// never get past this line (unless copy ctor
modified)
}

The Controller class has a copy constructor defined,
which gets called several times (by the thread class?)

Controller( const Controller& ctrl )  {
   boost::mutex::scoped_lock lock( m_mutex );
   m_thr = ctrl.m_thr;  // bad ??

   BUT ... if I do m_thr = NULL; then everything is
ok.  Why???  What's going on here???
}

Any help/explanation would be appreciated.
Rob

 
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