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Weird behavior with mislocked: oct-file is unloaded while checking lock
From: |
Michael Goffioul |
Subject: |
Weird behavior with mislocked: oct-file is unloaded while checking lock state... |
Date: |
Mon, 1 Sep 2008 17:34:09 +0200 |
Hi,
While still trying to lock FLTK backend code when it is loaded (to avoid
crash on "clear -f"), I added the following in __init_fltk__:
octave_call_stack::top()->lock();
Then I use the following test code:
backend('fltk'); <-- this calls __init_fltk__
mislocked('__init_fltk__')
After that, I noticed that the backend behave strangely, especially
the fact that one bool static variable contained in fltk_backend.oct
was reset to false (while __init_fltk__ set it to true). After debugging,
I ended up in out_of_date_check_internal (symtab.cc) around line 208
if (file.empty ())
{
// Can't see this function from current
// directory, so we should clear it.
function = octave_value ();
}
After this piece of code, the module fltk_backend.oct is unmapped
from memory, losing the value of the internal static variable. Later on,
I guess the module is reloaded again and the static variable gets its
default value. I found this weird as __init_fltk__ is locked, so I had hoped
this would prevent unloading fltk_backend.oct.
I'm a little bit confused about this. John, could you give me a hint?
Michael.
- Weird behavior with mislocked: oct-file is unloaded while checking lock state...,
Michael Goffioul <=
- Weird behavior with mislocked: oct-file is unloaded while checking lock state..., John W. Eaton, 2008/09/02
- Re: Weird behavior with mislocked: oct-file is unloaded while checking lock state..., Michael Goffioul, 2008/09/03
- Re: Weird behavior with mislocked: oct-file is unloaded while checking lock state..., Michael Goffioul, 2008/09/03
- Re: Weird behavior with mislocked: oct-file is unloaded while checking lock state..., John W. Eaton, 2008/09/03
- Re: Weird behavior with mislocked: oct-file is unloaded while checking lock state..., Michael Goffioul, 2008/09/04
- Re: Weird behavior with mislocked: oct-file is unloaded while checking lock state..., John W. Eaton, 2008/09/04
- Re: Weird behavior with mislocked: oct-file is unloaded while checking lock state..., Michael Goffioul, 2008/09/04
- Re: Weird behavior with mislocked: oct-file is unloaded while checking lock state..., John W. Eaton, 2008/09/04
- Re: Weird behavior with mislocked: oct-file is unloaded while checking lock state..., Michael Goffioul, 2008/09/05