Re: [Dynapi-Dev] Continuing Freeing memory

[Jordi - I. - M. <jmi...@or...>]

Oh my this is going to be fun

Raymond Smith wrote:

> Sounds like we need a "null cycle killer".  Damn sure circular references a
> playing a big roll in our leak...
>
> >
>
> This problem with cycles is the price that must be paid for a simple,
> lightweight, portable garbage collection scheme. The only way to prevent
> this problem is by manual intervention. If you create code in which A refers
> to B, B refers to C, and C refers to A, then you must be able to recognize
> that you've created a cycle, and take steps to force the cycle to be garbage
> collected when it is no longer needed.
>
> When you know that the objects in your cycle are no longer in use, you can
> force them to be garbage collected by breaking the cycle. You can do this by
> picking one of the objects in the cycle and setting the property of it that
> refers to the next object to null. For example, suppose that A, B, and C are
> objects that each have a next property, and the value of this property is
> set so that these objects refer to each other and form a cycle. When these
> objects are no longer in use, you can break the cycle by setting A.next to
> null. This means that object B no longer has a reference from A, so its
> reference count can drop to zero and it can be garbage collected. Once it
> has been garbage collected, then it will no longer refer to C, so its
> reference count can drop to zero and it can be garbage collected. Once C is
> garbage collected, A can be garbage collected.
>
> Note, of course, that none of this can happen if A, B, and C are stored in
> global variables in a window that is still open, because those variables A,
> B, and C still refer to the objects. If these were local variables in a
> function, and you broke their cycle before the function returned, then they
> could be garbage collected. But if they are stored in global variables, they
> will remain referenced until the window that contains them closes. In this
> case, if you want to force them to be garbage collected you must break the
> cycle and set the variables to null:
>
> A.next = null;      // break the cycle
> A = B = C = null;   // remove the last remaining external references
>
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