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Date: Sat, 06 Feb 2010 14:25:08 +0900 (JST)
Message-Id: <20100206.142508.58450194.garrigue at math.nagoya-u.ac.jp>
To: jon at ffconsultancy.com
Subject: Re: [Lablgtk] Threading woes
From: Jacques Garrigue <garrigue at math.nagoya-u.ac.jp>
In-Reply-To: <201002060530.16615.jon at ffconsultancy.com>
References: <201002060530.16615.jon at ffconsultancy.com>
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Cc: lablgtk at yquem.inria.fr
Status: U

From: Jon Harrop <jon@ffconsultancy.com>

> and am compiling with:
> 
>   ocamlopt -annot -thread -I +lablgtk2 -I +lablgtkgl2 -I +lablgl lablgl.cmxa 
> lablgtk.cmxa lablgtkgl.cmxa unix.cmxa threads.cmxa gtkThread.cmx x.ml -o x
> 
> but when I run the resulting program I get a segfault:
> 
>   $ ./x
> 
>   (process:15948): GLib-GObject-WARNING **: invalid (NULL) pointer instance
> 
>   (process:15948): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion
>   `G_TYPE_CHECK_INSTANCE (instance)' failed
>   Segmentation fault
> 
> What am I doing wrong?

This just looks like you didn't initialize gtk.
You need either to add a call to GMain.init or to link with
gtkInit.cmx.

Cheers,

Jacques

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