Re: [Boost-users] Boost.Thread locking across two functions

From: Moshe Matitya (Moshe.Matitya_at_[hidden])
Date: 2006-06-14 12:21:58

On Fri, 09 Jun 2006 22:51:48 -0300, Peteris Krumins [Newsgroups] 
<pknewsgroups_at_[hidden]> wrote: 
> 
> Hello! 
> 
> I am using a library which itself internally does not use any thread 
> sync mechanisms but it provides callback functions 
> lib_lock() and lib_unlock() which I can specify if the lib is used in 
> multithread environment. 
> lib_lock() would get called before critical segment and after it 
> lib_unlock() would get called. 
> 
> I read Boost.Thread documentation and I understand that lock concept
is 
> not thread-safe itself and should be used only at block scope. 
> This makes me think that I have no way to use locking provided by
Boost 
> to acquire a lock in 
> lib_lock() function and release it in lib_unlock()? But I am not sure.

> 
> Do you have any suggestions if this can be done using Boost? 
> 
> Thanks! 
> P.Krumins 

I don't think it was intended to be used this way, but you can
accomplish what you want with the lock_ops<> class:

    mutex m;

    lib_lock()
    {
        boost::detail::thread::lock_ops<boost::mutex>::lock (m);
    }

    lib_unlock()
    {
        boost::detail::thread::lock_ops<boost::mutex>::unlock (m);
    }

Moshe