Subj : Re: Recursive mutexes
To   : comp.programming.threads
From : Mikhail Polatov
Date : Wed Mar 23 2005 08:51 pm

"notme" <a@b.c> writes:

> I'm trying to implement in C++ a recursive mutex class, because the 
> operating
> system doesn't provide one (it only provides ordinary mutexes and critical 
> sections)
> So far, I have done this:
>
> void my_mutex::acquire() {
> EnterCriticalSection();
> if (m_owner == thread_id) {
>     ++m_count;
> }
> else {
>     m_mutex->wait();
>     m_count = 1;
>     m_owner = thread_id;
>  }
> ExitCriticalSection();
> }
>
> void my_mutex::release() {
> EnterCriticalSection();
>     --m_count;
>     if (m_count == 0)
>         m_mutex->signal();
> ExitCriticalSection();
> }
>
> I guess the variable's names are self-explanatory. Is this implementation 
> ok? I'd like to hear from the experts here
> any comment or advice about corrections, performance changes, etc. Remember 
> that I can only use
> these primitives.
>
> Thanks!
>

Why do you need a recursive mutex in the first place?
You can always refactor your code not to use them plus you'll get the
faster code.

-- 
Mikhail Polatov

.