Re: [boost] A proposal for a fully-portable reader-writer lock

From: Luis Coelho (deepblack9_at_[hidden])
Date: 2001-04-24 18:48:18

Em Terça, 24 de Abril de 2001 22:09, escreveste:
> I'd like to propose this reader-writer lock as an addition to the boost
> library.
>
> It supports the basic interface:
>
> void lock();
> void unlock();
> void lock() const;
> void unlock() const;
>
> Any number of threads are allowed into the critical section if the const
> version of lock is used, but at most one thread is allowed into the
> critical section if the non-const versions is called.

IMHO, distinguishing between read locks and write locks by const is an 
interface mistake. It is better to just have two functions:

lock_read();
lock_write();

Or perhaps:

enum lock_type { read, write };

lock(lock_type);

Which is not so good since enums are not that type safe, but one could 
improve upon the idea of having a lock function taking the type of lock as an 
argument. I prefer two functions however.

As for unlock, won't a single version (non-const) do?

Regards,
-- 
Luis Pedro Coelho.
Check out my game of Hearts, a card game, for KDE at:
http://www.geocities.com/deepblack9/index.html