Detaching free function from String in C API

ruby-talk
1

Hi

In a C extension, you can unset the 'free' function that will be called when an object is garbage collected with something like:

RDATA(obj)->dfree = 0;

This is useful if you know that whatever C library you're interfacing to will take care of free-ing the C structure.

Is the same thing is possible with an in-built ruby String object, to set it so that the underlying char* contents will not be freed when the String is GC'd?

thanks
alex

2

ts wrote:

Alex Fenton wrote:

Is the same thing is possible with an in-built ruby String object, to
set it so that the underlying char* contents will not be freed when the
String is GC'd?

Look at mmap (in RAA), when you write

  m = Mmap.new("aa")

the object in `m' is in reality a String object and mmap make in
sort that ruby will never free the char * content, otherwise it
will crash.

Perfect, thanks. I will read the source and ponder

alex