Mail Archives: djgpp/2008/03/13/13:46:15

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Mail Archives: djgpp/2008/03/13/13:46:15

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From: "BBelden" <bbelden AT teleco DOT com>

To: <djgpp AT delorie DOT com>

References: <000901c8852a$4cb610a0$2102a8c0 AT telecobbelden>

Subject: RE: spawnl mode=P_OVERLAY

Date: Thu, 13 Mar 2008 14:42:58 -0400

Message-ID: <001101c8853a$0f0ae9f0$2102a8c0@telecobbelden>

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I have found the problem, bug?.

Using cwsdpmi.exe as a TSR helped debug this.

After a parent spawns(P_OVERLAY.) a child and then completely exiting all
programs, 

djgpp did not release the (both?) processes upper memory areas.

You can see this after successive calls to mem/c to see the problem.

 

 

 

  _____  

From: BBelden [mailto:bbelden AT teleco DOT com] 
Sent: Thursday, March 13, 2008 12:50 PM
To: djgpp AT delorie DOT com
Subject: spawnl mode=P_OVERLAY

 

Hello everyone.

 

I have searched through the archives for help but didn't really help.

 

I have multiple djgpp (32bit) compiled programs that continuously
spawnl(P_OVERLAY,.) each other.

 

The problem is, I have 100k conventional memory available at the start of
these

Programs.  

 

The parent always calls the child with spawnl(P_OVERLAY,.)

 

I can do this about 6 times before crashing to dos.

 

Can I deallocate the memory used by the parent?  It seems that the parent's
memory

Never becomes available. 

 

Is is true that each successive call to spawnl will need ~18k of
conventional memory

Even if I use P_OVERLAY?

 

Thanks for any help\ideas

Bruce

 

 


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<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>I have found the problem, =
bug?.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Using cwsdpmi.exe as a TSR helped =
debug
this.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>After a parent =
spawns(P_OVERLAY&#8230;) a
child and then completely exiting all programs, =
<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>djgpp did not release the (both?)
processes upper memory areas.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>You can see this after successive =
calls to
mem/c to see the problem.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

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<p class=3DMsoNormal><b><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font =
size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'> =
BBelden
[mailto:bbelden AT teleco DOT com] <br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Thursday, March 13, =
2008
12:50 PM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> djgpp AT delorie DOT com<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> spawnl =
mode=3DP_OVERLAY</span></font><o:p></o:p></p>

</div>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Hello everyone.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>I have searched through the archives for help but
didn&#8217;t really help.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>I have multiple djgpp (32bit) compiled programs that
continuously spawnl(P_OVERLAY,&#8230;) each =
other.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>The problem is, I have 100k conventional memory =
available at
the start of these<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Programs.&nbsp; <o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>The parent always calls the child with
spawnl(P_OVERLAY,&#8230;)<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>I can do this about 6 times before crashing to =
dos.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Can I deallocate the memory used by the parent?&nbsp; =
It
seems that the parent&#8217;s memory<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Never becomes available. =
<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Is is true that each successive call to spawnl will =
need
~18k of conventional memory<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Even if I use P_OVERLAY?<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Thanks for any =
help\ideas<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Bruce<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

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X-Authentication-Warning:	delorie.com: mail set sender to djgpp-bounces using -f
X-Recipient:	djgpp AT delorie DOT com
From:	"BBelden" <bbelden AT teleco DOT com>
To:	<djgpp AT delorie DOT com>
References:	<000901c8852a$4cb610a0$2102a8c0 AT telecobbelden>
Subject:	RE: spawnl mode=P_OVERLAY
Date:	Thu, 13 Mar 2008 14:42:58 -0400
Message-ID:	<001101c8853a$0f0ae9f0$2102a8c0@telecobbelden>
MIME-Version:	1.0
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