Glib binding in Crystal lang (GC issue)

Question

I am trying to link some functions from glib to Crystal. I did this and it works:

@[Link("glib-2.0")]
lib LibG
  fun g_utf8_strup(str : UInt8*, len : UInt32) : UInt8*
  fun g_utf8_strdown(str : UInt8*, len : UInt32) : UInt8*
end

However, it introduces a memory leak: objects created using the g_ * functions will never be garbage collected.

Is it possible for glib to play well with GC Boehm in Crystal? Inspired by PCRE , I tried this:

@[Link("glib-2.0")]
lib LibG
  # These 2 functions work perfectly
  fun g_utf8_strup(str : UInt8*, len : UInt32) : UInt8*
  fun g_utf8_strdown(str : UInt8*, len : UInt32) : UInt8*

  alias Malloc = LibC::SizeT -> Void*
  alias Free = Void* ->
  $g_malloc : Malloc
  $g_free : Free
end

# At this point happens segmentation fault
LibG.g_malloc = ->GC.malloc(LibC::SizeT)
LibG.g_free = ->GC.free(Void*)

Hoping to override / override the functions g_mallocand g_free. But this will not work: it fails with a segmentation error.

Any ideas how to get glib to play with GC? I found some related question, but that didn't help me: Garbage collection with glib?

Thanks.

Answer 1

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