Re: [Boost-Users] Boost thread question

From: William E. Kempf (wekempf_at_[hidden])
Date: 2003-03-19 11:34:06

Michael said:
> I am having trouble getting the boost thread library to work.  I am
> using Borland C++Builder 6 (on Win2k), and I tried the 1.29.0 release
> and the 1.30.0.b1 beta release and both give me the same errors in  the
> condition.hpp file:
>
> line 93: " 'operator!' not implemented in type 'recursive_mutex' for
> arguments of the same type"
>
> and
>
> line 96: " 'recursive_mutex::m_mutex' is not accessible"

Looking at these lines and making some assumptions, I think you're passing
the wrong type to wait().  You need to pass a Lock, not a Mutex.  IOW I
think you have something like this:

recursive_mutex mx;
condition cond;
while (pred)
   cond.wait(mx);

when you should instead have this:

recursive_mutex mx;
condition cond;
recursive_mutex::scoped_lock lock(mx);
while (pred)
   cond.wait(lock);

> Plus another 5 errors.  I tried to look at the condition and
> recursive_mutex class definitions and I do not understand how they  are
> implemented.  Am I using it wrong to get that error?

I believe so, but you'll have to let me know if I interpreted things
correctly.

-- 
William E. Kempf