From: nobuyoshi nakada <nobuyoshi.nakada@...>
Date: 2005-07-08T13:41:39+09:00
Subject: Re: Questions about GC, memory management and C extensions

Hi,

At Fri, 8 Jul 2005 09:43:19 +0900,
Zed A. Shaw wrote in [ruby-talk:147507]:
> 5.  Many C libraries (like libevent) allocate their own memory for
> structures and initialize in one shot, but the Data_Wrap_Object macros
> and other functions seem to require pre-existing memory.  This leads to
> a contradiction where I must allocate the libevent structure in my
> _alloc method, but initialize it in my _initialize method which I can't
> do since allocation and initialization are done in one call.  Is there a
> way to create, initialize, and attach C library structures inside the
> _initialize method only?

Leave DATA_PTR NULL in alloc_func, and allocate new structure
in #initalize.  You'll have to check first if it is valid, in
each instance methods.

-- 
Nobu Nakada