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From: Ion Gaztañaga (igaztanaga_at_[hidden])
Date: 2007-08-22 11:15:52

Howard Hinnant wrote:
> On Aug 21, 2007, at 3:06 PM, Roland Schwarz wrote:
>> What does public lock unlock provide, that cannot be achieved with
>> moveable locks also?
> [...}
> Alternatively you may want to write your own mutexes, and have them
> work with the std::supplied locks. This can't be done with the boost
> design, because there is no standard interface for your mutex to
> implement.

A practical example: Boost.Interprocess mutexes. I had to reimplement
all the locks (following your the proposed interface) because scoped
lock has no public requirements on what a mutex should provide. Locks
were also tightly coupled with boost::condition via friendship.

If generic algorithms are provided, we can safely use them with
Boost.Interprocess mutexes and locks. I could also reuse standard locks
with process-shared mutexes if a user prefers them or programs generic
algorithms templatized on the mutex type.

Process-shared condition variables would be a different beast. We'll
need to define a new condition variable type (I'm afraid that
specialization is not enough, because this pshared_condition should also
work with arbitrary mutex types).



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