gnat 3.15p/Windows and tasking bug
michael bode
Windows regarding tasking and delay statements that delay much longer
than they should sometimes. What I don't remember and also did not
find through Google was a precise description and if there was a
workaround or some success using gcc-gnat 3.4.x (3.4.5 is the current
MinGW version I think).
To be precise I found references to TWO such bugs one of them was
limited to rather old mainboards or chipsets. I'm searching for
information on the other bug.
Alex R. Mosteo
I keep a copy of my old patch for gnat 3.15p/win. You could try comparing
these files to the original ones to find the diffs, and also compare them
to the mingw ones. I think that 3.15p was still 2.x based, so maybe they're
too different.
Anyhow, the files are here:
https://svn.mosteo.com/public/adagio/gnatpatch/
I strongly suspect the only one with modifications is s-tasren.adb, the
others are simply there because they had to be recompiled because of
dependencies. However this is just a fuzzy recall.
What I can say is that when recompiling these files and linking them with my
program, the bug went away. I received two different patches, but can not
remember their origins. I kept the most recent one, the older one caused
some other bug.
To compile, gnatmake -u -a *.ad? and then include the objects for linking.
The other way is to recompile the entire gnat runtime with the patched
sources. I preferred the first way so I was sure that any stock unmodified
3.15p installation would serve.
Hope this helps.
Michael Bode
> https://svn.mosteo.com/public/adagio/gnatpatch/
>
> I strongly suspect the only one with modifications is s-tasren.adb, the
> others are simply there because they had to be recompiled because of
> dependencies. However this is just a fuzzy recall.
Thanks. The only difference apart from revision numbers is in
s-osprim.adb in line 165:
Base_Monotonic_Clock := Base_Clock;
> What I can say is that when recompiling these files and linking them with my
> program, the bug went away.
Mine went away when I started to insert debugging code. Seems to be
a Heisenbug :-(
--
Michael Bode
Alex R. Mosteo
> "Alex R. Mosteo" <dev...@mailinator.com> writes:
>
>> https://svn.mosteo.com/public/adagio/gnatpatch/
>>
>> I strongly suspect the only one with modifications is s-tasren.adb, the
>> others are simply there because they had to be recompiled because of
>> dependencies. However this is just a fuzzy recall.
>
> Thanks. The only difference apart from revision numbers is in
> s-osprim.adb in line 165:
>
> Base_Monotonic_Clock := Base_Clock;
Now that you point it, it rings a bell: it was in fact s-osprim.adb and that
was the change.
>> What I can say is that when recompiling these files and linking them with
>> my program, the bug went away.
>
> Mine went away when I started to insert debugging code. Seems to be
> a Heisenbug :-(
A Bad Thing, I'm sorry. If you can get the archive of the old Gnat list
(I've been unable myself after five minutes), I posted there a testcase
that helped me, with the aid of several people, to test for this bug. It
was a simple program with a lot of tasks that usually triggered the bug in
few minutes. Nobody in that list knew of the bug, so we hunted for it in
several platforms.
Best,
A. Mosteo.