Subj : Re: Recursive mutexes
To   : comp.programming.threads
From : notme
Date : Sat Mar 26 2005 08:19 pm

>> Not in my system. Why you assume I'm using windows? :-)
>
> DOH!
>
> I instantly thought windows because you used EnterCriticalSection. I 
> failed to see the call to ExitCriticalSection. Windows has 
> EnterCriticalSection/LeaveCriticalSection API's. Thats what confuused me.

No problem :-)

> Ok, you can do it like this:
>
>
> void my_mutex::acquire() {
> if (m_owner == thread_id) {
>    ++m_count;
>    return;
> }
>
> EnterCriticalSection();
> m_owner = thread_id;
> }

Interesting approach! So it seems this can be done with just one synch 
object!?

> void my_mutex::release() {
> if (m_count) {
>    --m_count;
>    if ( m_count ) { return; }
> }
>
> m_owner = 0;
> ExitCriticalSection();
> }

Any advantages if enforcing the if with "&& m_owner == thread_id" ? In any 
case,
it should be expected the code not being ill behaved. Or I could add this 
check and
display an error, right?

Thank you very much for your help. Very enlightening.

.