[fpc-devel] Suggestion: reference counted objects
pascaldragon at googlemail.com
Sun Sep 21 12:41:36 CEST 2014
On 21.09.2014 05:34, Hans-Peter Diettrich wrote:
> Sven Barth schrieb:
>> Am 20.09.2014 20:34 schrieb "Giuliano Colla"
>> > 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.
>> That would work the same way as it does in interfaces, arrays and
>> strings: using Interlocked*-functions.
> As I understand Interlocked Inc/Dec funtionality, it only protects the
> update of the reference counter against interrupts, but not the tests
> required before/after this update. As a precaution a RefCount should at
> least be incremented as soon as there exists a *chance*, that the
> reference is used/copied in some piece of currently active code
No, why should it? It works pretty well with interfaces, strings and
arrays (let's put aside modifying the latter two, because COW is not
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