[fpc-devel] Suggestion: reference counted objects
iz.iznogood at gmail.com
Sat Sep 20 21:07:01 CEST 2014
You don't miss anything, we agree. That is why I propose an explicit
implementation either using a compiler switch or generic records (smart
pointer). This way the developer has full control on when the feature is
used or not. The smart pointer approach is more flexible I believe.
Sorry for the noise,
Στις 20 Σεπ 2014 9:34 μ.μ., ο χρήστης "Giuliano Colla" <
giuliano.colla at fastwebnet.it> έγραψε:
> Il 20/09/2014 19:20, Boian Mitov ha scritto:
> Hi Chriss,
> Personally I favor reference counted objects. While there are interfaces
> as you pointed, and in Delphi you can even use smart pointers now, there is
> still a lot of cases when you need to use objects, and have to manually
> free them.
> In single threaded environment that is not such an issue, but in parallel
> and heavily multithreaded environments, reference counting is a life saver.
> Can you explain how reference counting can be safely implemented in a
> parallel multithreaded environment, without heavily affecting performance?
> A mere increment or decrement of count means to get a lock and to release
> a lock on that object. Application code can know what is thread safe and
> what is not, and use lock only when appropriate.
> A general mechanism to be reliable should take into account all
> possibilities. If it does, it will block threads even when unnecessary. If
> it doesn't, it will be unsafe.
> What do I miss?
> fpc-devel maillist - fpc-devel at lists.freepascal.org
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