[Boost-users] [interprocess] named_upgradable_mutex

Subject: [Boost-users] [interprocess] named_upgradable_mutex
From: Moritz (mokoman_at_[hidden])
Date: 2009-06-30 14:52:48

Hi everybody,

I have a question concerning the interprocess::updgradable::mutex.

My scenario:
I have a writer, which is manipulating an object in a 
interprocess::managed_shared_memory. And I have 'n' readers which are 
reading the object in the shared mem. If the writer is ready to write, 
it should get the possibility as fast as possible. So this is a variety 
of the classical readers/writers problem and I already found a good 
solution that fits my requirements.
But this solution uses 3 mutexes and 1 counter so I am looking for a 
more efficient solution.

The idea is that the writer locks the upgradable_mutex normally (calling 
lock()) and the readers lock it sharable (calling lock_sharable()). If 
the mutex is locked sharable and the writer tries to lock it normally, 
another attempt to lock it sharable has to wait until the writer 
succeeded in locking and unlocking the mutex.

Is this correct proceeding?

Thank you
Moritz