Subj : Recursive mutexes
To   : comp.programming.threads
From : notme
Date : Thu Mar 24 2005 12:07 am

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!

.