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<DIV dir=ltr align=left><SPAN class=650532300-09112007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=650532300-09112007><FONT face=Arial
color=#0000ff size=2>Ok - I got the bottom of this.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=650532300-09112007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=650532300-09112007><FONT face=Arial
color=#0000ff size=2>1) I had a c++ class with no virtual destructor
defined.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=650532300-09112007><FONT face=Arial
color=#0000ff size=2><SPAN class=650532300-09112007><FONT face=Arial
color=#0000ff size=2>2) </FONT></SPAN>I wrapped it in sip.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=650532300-09112007><FONT face=Arial
color=#0000ff size=2>3) Constructed an instance in python</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=650532300-09112007><FONT face=Arial
color=#0000ff size=2>4) Transferred ownership to C++</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=650532300-09112007><FONT face=Arial
color=#0000ff size=2>5) allowed c++ to delete it</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=650532300-09112007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=650532300-09112007><FONT face=Arial
color=#0000ff size=2>The sip wrapper still continued to live in the cpp to
wrapper hash map. This would cause nasty crashes.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=650532300-09112007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=650532300-09112007><FONT face=Arial
color=#0000ff size=2>I wonder if there is anything that can be done to fix this
or at least detect it? Adding a virtual destructor and exposing that in the sip
definition fixed it of course.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=650532300-09112007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=650532300-09112007><FONT face=Arial
color=#0000ff size=2>Regards,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=650532300-09112007><FONT face=Arial
color=#0000ff size=2>Andrew</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=650532300-09112007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> pyqt-bounces@riverbankcomputing.com
[mailto:pyqt-bounces@riverbankcomputing.com] <B>On Behalf Of </B>Dr Andrew
Perella<BR><B>Sent:</B> 08 November 2007 23:09<BR><B>To:</B>
pyqt@riverbankcomputing.com<BR><B>Subject:</B> [PyQt]
'pyqt@riverbankcomputing.com'<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><FONT face=Arial size=2>I get exactly the same <SPAN
class=700354622-08112007>objmap.c </SPAN>crash as you in an ap<SPAN
class=700354622-08112007>p</SPAN>lication I have written using SIP (but not
PyQT).</FONT></DIV>
<DIV><FONT size=2><FONT face=Arial>The crash is timing related - depending on
when the garbage collector is called, the sip hashmap still has a
reference sometimes to a freed python wrapper.</FONT></FONT></DIV>
<DIV><SPAN class=700354622-08112007><FONT face=Arial size=2>I will investigate
further.</FONT></SPAN></DIV>
<DIV><SPAN class=700354622-08112007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=700354622-08112007><FONT face=Arial
size=2>Cheers,</FONT></SPAN></DIV>
<DIV><SPAN class=700354622-08112007><FONT face=Arial
size=2>Andrew</FONT></SPAN></DIV>
<DIV><SPAN class=700354622-08112007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=700354622-08112007><FONT face=Arial size=2>P.S. I made the
same "fix" you did to objmap.c:</FONT></SPAN></DIV>
<DIV><SPAN class=700354622-08112007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=700354622-08112007><FONT color=#0000ff size=2>
<P>while</FONT><FONT size=2> (</FONT><FONT color=#010001 size=2>w</FONT><FONT
size=2> != </FONT><FONT color=#010001 size=2>NULL</FONT><FONT
size=2>)</FONT></P>
<P><FONT size=2>{</FONT></P>
<P><FONT color=#008000><FONT size=2>/* We are removing it from the map here.
*/</FONT></P></FONT>
<P><FONT size=2><FONT color=#010001>sipSetNotInMap</FONT>(<FONT
color=#010001>w</FONT>);</FONT></P>
<P><FONT size=2><FONT color=#010001>sip_api_common_dtor</FONT>(<FONT
color=#010001>w</FONT>);</FONT></P>
<P><FONT size=2><FONT color=#010001><SPAN
class=700354622-08112007> </SPAN>w</FONT> = <FONT
color=#010001>w</FONT>-><FONT color=#010001>next</FONT>;</FONT></P>
<P><FONT size=2></FONT> </P>
<P><SPAN class=700354622-08112007><FONT size=2>//extra code "fix"
here</FONT></SPAN></P>
<P><FONT size=2><FONT color=#0000ff>if</FONT> (<FONT
color=#010001>w</FONT>==0xdbdbdbdb)</FONT></P>
<P><FONT size=2>{</FONT></P>
<P><FONT size=2><FONT color=#010001>printf</FONT>(<FONT color=#a31515>"WARNING:
SIP would normally crash - would try to access freed
memory\n"</FONT>);</FONT></P>
<P><FONT size=2><FONT color=#010001>w</FONT>=<FONT
color=#010001>NULL</FONT>;</FONT></P>
<P><FONT size=2>}</FONT></P>
<P><FONT size=2>}</FONT></P></SPAN></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
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