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Re: Proper way of making a single-pointer smob

From: Sun Yijiang
Subject: Re: Proper way of making a single-pointer smob
Date: Fri, 31 May 2013 11:08:02 +0800

Thank you guys, I got it through.


2013/5/29 Mike Gran <address@hidden>:
>>Hi guys,
>>I'm using a very simple smob which only carries a pointer in the
>>immediate word.  It works fine, but what worries me is that the free
>>function seems never called.   Am I doing anything wrong?  What's the
>>standard way of making such kind of smob?
> What you are doing is mostly right, except for this.
>> model_smob_t = scm_make_smob_type("model", 0);  // shall I use zero here?
> Your "0" should be sizeof(MyModel*)
> But that's not the problem.
> The problem is either
> 1. You still have a pointer to the smob somewhere.  You need to make
>  sure that there are no pointers anywhere to the smob.
> 2. The garbage collector isn't being run.  Maybe you never allocate
> enough memory to cause the gc to run.  You can fix this by adding
> a "scm_gc()" call just before you program exits to force a garbage
> collection.
> 3. Some versions of Guile have a bug where the last smob defined
> in your program is never freed, even if you've cleared out the
> pointers and called scm_gc.
> -Mike

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