[boost] Re: Boost.Threads: Do we need all those mutexes?

From: Howard Hinnant (hinnant_at_[hidden])
Date: 2004-07-12 15:25:21

On Jul 12, 2004, at 1:35 PM, Peter Dimov wrote:

>> On the other hand, our Windows implementation of condition::wait
>> follows the algorithm laid out by Alexander Terekhov's "Algorithm 8a"
>> posted in comp.programming.threads on April 27, 2001 (and noted as
>> such in that file Alexander).  In this case the wait() function does 
>> not
>> differ depending upon the recursiveness of the mutex.
>
> To clarify: does your implementation support waiting on a recursive 
> mutex
> that has been locked more than once, temporarily decreasing its lock 
> count
> to zero to allow other threads to acquire the mutex while the original
> thread is blocked by the wait?

That was the intent.  But I stand corrected.  I evidently got it wrong 
except on Mac OS X where I do explicitly decrement the count to 0 of 
the pthread_mutex during a wait (recursive mutex case only).  Looks 
like I need to dig back into this on other platforms...

-Howard