Re: [Valgrind-users] Possible data race during read of size 4

[Julian S. <js...@ac...>]

> I have a server which creates a new detached pthread every time it
> accepts a new connection.

Hmm, detached threads are bad news, at least from a race detection 
point of view.  See

http://www.valgrind.org/docs/manual/hg-manual.html#hg-manual.effective-use
point 5 ("Round up all finished threads using pthread_join. ...").

Try to pthread_join all your threads before the end of the program
and see if that improves the situation.  Maybe the lock you added
isn't really necessary.

> My question is: has there really been a data race, or did valgrind
> only decide that if the timing is right, there could be a data race?
>
> >From the way i see  it, there could not have been a real data race...

But because your threads are detached, Helgrind cannot know when they
finish (logically) relative to each other and the parent.  That's why
it is better to pthread_join to them.

J