[fpc-devel] Suggestion: reference counted objects
DrDiettrich1 at aol.com
Sun Sep 21 05:34:26 CEST 2014
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 (thread...).
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