in reply to Re^3: Inline::C self-referential struct idioms and memory
in thread Inline::C self-referential struct idioms and memory

Mmmm... I'm trying out your version and I'm getting:

perl(50784,0x7fff7dec7310) malloc: *** error for object 0x100000000000
+0000: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug

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Presumably some kind of variation in Perl and OS? I notice you're on windows. I'm on OSX10.9, Perl version 5.16.2.

ETA: the address 0x7fff7dec7310 is not any of the ones that show up in the Devel::Peek::Dump() outputs, by the way.

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Re^5: Inline::C self-referential struct idioms and memory
by BrowserUk (Patriarch) on Sep 04, 2015 at 16:15 UTC
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      If I only call the constructors but no getter/setters, and I put a while(1){} at the end of Node.pl it doesn't happen, the script just "waits" (loops). So one thing that triggers it is global object destruction.

      If I call set_parent($p), then an infinite loop, I notice that the destructor is triggered on the invocant $node (but not on $p). The malloc error doesn't happen. Note that the setter is not void: it returns the invocant. So there's a side effect to the conversion of the output in the typemap that makes a refcount drop to zero somewhere, triggering object destruction. However, a blessed reference to Node* is still returned.

      If I call set_parent twice, the malloc error happens.

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        I can only conclude that this is due to some change that has taken place since 5.10 (all my Inline C stuff is still tied to that build); and you are going to need more expertise than I have to track down the cause.

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