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Subject: Re: [Lablgtk] bus error when use threads and native mode on Mac
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From: Jacques Garrigue <garrigue at math.nagoya-u.ac.jp>
In-Reply-To: <AANLkTikqpcC-rmR5mubby36N=C_9fiSO17RBxgrOT3E5 at mail.gmail.com>
Date: Fri, 17 Sep 2010 20:01:34 +0900
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References: <2A3284AC-8CF8-40B6-9CD6-6240A2977A73 at facebook.com>
	<AANLkTikqpcC-rmR5mubby36N=C_9fiSO17RBxgrOT3E5@mail.gmail.com>
To: Olivier Andrieu <oandrieu at gmail.com>
Cc: "lablgtk at yquem.inria.fr" <lablgtk at yquem.inria.fr>,
	Yoann Padioleau <pad@facebook.com>
Reply-To: garrigue at math.nagoya-u.ac.jp
Status: U

On 2010/09/17, at 18:27, Olivier Andrieu wrote:
> Hi,
>=20
> On Fri, Sep 17, 2010 at 11:02, Yoann Padioleau <pad@facebook.com> =
wrote:
>> Hi,
>>=20
>> I am trying to use threads in my lablgtk application but it crashes =
(I am on Mac OS)
>> in native mode with a mysterious "Bus Error".
>> I have linked my program with -thread and use
>>  GtkThread.main ();
>> in the main but it does not work. It works nice in bytecode mode =
though.
>>=20
>> My program displays some fancy graphics with cairo and then run in =
the background using a thread
>> some heavy computation that I access on demand from the main thread =
when the user click
>> on certain things.
>>=20
>> My code also uses GMain.Idle and Gmain.Timeout (don't know if it's =
relevant).
>=20
> It might ! Timeout and idle callbacks have different rules than the
> usual widget event callbacks wrt. threading.
> cf. =
http://library.gnome.org/devel/gdk/stable/gdk-Threads.html#gdk-Threads.des=
cription
>=20
>  =AB Idles, timeouts, and input functions from GLib, such as
> g_idle_add(), are executed outside of the main GTK+ lock. =BB

Actually, this shouldn't be relevant, as LablGTK does not use GTK+ =
thread locking.
It only uses the giant ocaml lock.
But we may need more information on your program.
Are you using Gtk+ on X11 or Quartz (the latter is much more picky with =
threads)?
What are all the versions (did you try with 2.14.2?)

The difference between bytecode and native is intriguing.
This maybe an ocaml problem, or just a problem triggerred by a =
difference in scheduling.

	Jacques=

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