"Steve Weber" <steve.weber.junk@gmail.com> writes:
Im kinda noob only 2 years of c++
When joining two threads using a recursive_mutex. The recursive_mutex is not shared resulting in dead lock. Is this a "bug" or am i missing something.
You are missing something: you are trying to join whilst holding the mutex that the thread you are waiting for is trying to acquire. Also, a plain mutex will work fine here.
also what would be a good solution to this?
Unlock the mutex before you try and join. As a rule of thumb, you shouldn't do blocking operations (e.g. join) whilst you have a mutex locked.
Example code of my problem. ----------------------------------------------------------------------
class Test{ public: boost::recursive_mutex m_mutex; boost::thread* m_thread; bool m_endThread; // start thread Test() : m_endThread( false ) { m_thread = new boost::thread( boost::bind( &Test::threaded, this ) ); } // cleanup virtual ~Test() { boost::recursive_mutex::scoped_lock l( m_mutex ); m_endThread = true; m_thread->join(); //< DEAD LOCK
delete m_thread; } // the thread that will block void threaded() { for (;;){ boost::recursive_mutex::scoped_lock l( m_mutex ); //< DEAD LOCK if ( m_endThread ) return; } } };
int main() { Test t; }
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