From: Victor Shepelev <vshepelev@...>
Date: 2006-03-26T23:42:38+09:00
Subject: Saving Proc object in C extension

Hi all.

The question is: can I save some Proc object in global variable of C
extension? 

What I've tried:

static VALUE g_callback;

//some callback-saving function:
static VALUE save_callback(VALUE self, VALUE proc)
{
...bla-bla-bla...

rb_global_variable(&proc); //as recommended in "Extending Ruby"

g_callback = proc;

...bla-bla-bla...
}

But when I've tried to use the saved g_callback later, I've received various
errors. Moreover,

rb_p(g_callback);

prints some garbage or crashes (just like object g_callback references is
deleted). Raw integer value of g_callback remains unchanged.

What I do wrong?

Thanks.

Victor.