Mail Archives: djgpp/2002/02/01/03:33:31
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You are right, I am wrong ;-(
Irq8 handler calls __djgpp_hw_exception, which nukes DJGPP's DS and returns,
so real multi-threading operations occurs when the processor accesses this
DS. This occurs when it is in the good time slice...
So, I am very pessimistic...
We may consider at this point that LWP can't work under Windows NT, in its
preemptive form, and that signals can't work.
Positive points : LWP works in non-preemptive mode (without irq8 handler),
and I don't have any problem with serial communications, using DZCOMM.
Allegro works fine too.
Of course, it is not a good idea to use DJGPP under Windows 2000 to develop
Windows 2000 applications, but it is quite useful to cross-develop and test
DOS applications (that is my need).
Regards
CB
-----Message d'origine-----
De : Eli Zaretskii [mailto:eliz AT is DOT elta DOT co DOT il]
Envoye : jeudi 31 janvier 2002 17:18
A : Baribaud, Christophe [JNJFR]
Cc : 'florian DOT proff DOT schulze AT gmx DOT net'; 'djgpp AT delorie DOT com'
Objet : Re: TR: LWP and Windows 2000
On Thu, 31 Jan 2002, Baribaud, Christophe [JNJFR] wrote:
> I have just done tests and tried patches to LWP, and I have an idea why it
> doesn't work under Windows 2000.
> LWP and Windows are both multi-threading preemptive environments, and they
> do preempt each other mutually.
I don't know why do you say this. LWP cannot by definition preempt
Windows because the DJGPP program using LWP is just one of the programs
running on the system, and it is fully under the Windows control: it only
runs whenever Windows gives it the CPU.
I think the problems on Windows 2000 are related to the general issue
with DJGPP signal handling on the NT family of Windows. For more details
about these problems, see section 3.3 of the DJGPP FAQ list.
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<TITLE>RE: TR: LWP and Windows 2000</TITLE>
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<P><FONT SIZE=3D2>You are right, I am wrong ;-(</FONT>
</P>
<P><FONT SIZE=3D2>Irq8 handler calls __djgpp_hw_exception, which nukes =
DJGPP's DS and returns, so real multi-threading operations occurs when =
the processor accesses this DS. This occurs when it is in the good time =
slice...</FONT></P>
<P><FONT SIZE=3D2>So, I am very pessimistic...</FONT>
</P>
<P><FONT SIZE=3D2>We may consider at this point that LWP can't work =
under Windows NT, in its preemptive form, and that signals can't =
work.</FONT></P>
<P><FONT SIZE=3D2>Positive points : LWP works in non-preemptive mode =
(without irq8 handler), and I don't have any problem with serial =
communications, using DZCOMM. Allegro works fine too.</FONT></P>
<P><FONT SIZE=3D2>Of course, it is not a good idea to use DJGPP under =
Windows 2000 to develop Windows 2000 applications, but it is quite =
useful to cross-develop and test DOS applications (that is my =
need).</FONT></P>
<P><FONT SIZE=3D2>Regards</FONT>
<BR><FONT SIZE=3D2>CB</FONT>
</P>
<BR>
<BR>
<P><FONT SIZE=3D2>-----Message d'origine-----</FONT>
<BR><FONT SIZE=3D2>De : Eli Zaretskii [<A =
HREF=3D"mailto:eliz AT is DOT elta DOT co DOT il">mailto:eliz AT is DOT elta DOT co DOT il</A>]</FONT>=
<BR><FONT SIZE=3D2>Envoye : jeudi 31 janvier 2002 17:18</FONT>
<BR><FONT SIZE=3D2>A : Baribaud, Christophe [JNJFR]</FONT>
<BR><FONT SIZE=3D2>Cc : 'florian DOT proff DOT schulze AT gmx DOT net'; =
'djgpp AT delorie DOT com'</FONT>
<BR><FONT SIZE=3D2>Objet : Re: TR: LWP and Windows 2000</FONT>
</P>
<BR>
<BR>
<P><FONT SIZE=3D2>On Thu, 31 Jan 2002, Baribaud, Christophe [JNJFR] =
wrote:</FONT>
</P>
<P><FONT SIZE=3D2>> I have just done tests and tried patches to LWP, =
and I have an idea why it</FONT>
<BR><FONT SIZE=3D2>> doesn't work under Windows 2000.</FONT>
<BR><FONT SIZE=3D2>> LWP and Windows are both multi-threading =
preemptive environments, and they</FONT>
<BR><FONT SIZE=3D2>> do preempt each other mutually.</FONT>
</P>
<P><FONT SIZE=3D2>I don't know why do you say this. LWP cannot by =
definition preempt </FONT>
<BR><FONT SIZE=3D2>Windows because the DJGPP program using LWP is just =
one of the programs </FONT>
<BR><FONT SIZE=3D2>running on the system, and it is fully under the =
Windows control: it only </FONT>
<BR><FONT SIZE=3D2>runs whenever Windows gives it the CPU.</FONT>
</P>
<P><FONT SIZE=3D2>I think the problems on Windows 2000 are related to =
the general issue </FONT>
<BR><FONT SIZE=3D2>with DJGPP signal handling on the NT family of =
Windows. For more details </FONT>
<BR><FONT SIZE=3D2>about these problems, see section 3.3 of the DJGPP =
FAQ list.</FONT>
</P>
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