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Date: Tue, 08 Apr 2008 19:32:01 -0400
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Subject: Re: Question on gdb and ?? And also Frame did not save PC message
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From: Brian Keener <bkeener AT thesoftwaresource DOT com>
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Brian Dessent wrote:
> thinking that somehow there's a segmentation fault in pthreads code when
> there isn't.  If you're going to enable the option then you need to
> "continue" past those non-faults.
Brian,
 
Thanks for clarifying that.  I was doing that for two reasons - the first 
is because I misunderstood the post I originally found that in.  Somehow I 
got the idea that the exceptions I needed to see were not getting through 
and this would help me debug the program and then I discovered earlier 
today exactly what you said - I can continue and keep going around the 
SIGSEGV at which point the program appears to be terminated by gdb when it 
completes.  I see now that as you say - setting cygwin-exceptions was not 
needed.  Without it I get the below which helps me some I think - in that 
it confirms the application is waiting on something to complete which 
doesn't and gdb terminates it. But now there is no stack because of 
termination - got to go to breakpoints now.  

As to the second part of my question - is there a way to determine what 
sources/debug info I still need to get around the ?? Or is that just a 
matter of tracing from the sources I can see to find what it is bing 
called next?

Also when using the new gdb is the message about 
"Frame did not save PC message" expected or is that an indication of some 
limit exceeded or something else.

Thanks again

bk

BrianK AT atl-lt-5783 /usr/local/bin/osgPlugins-2.3.7
$ gdb osgconvd
GNU gdb 6.5.50.20060706-cvs (cygwin-special)
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you 
are
welcome to change it and/or distribute copies of it under certain 
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for 
details.
This GDB was configured as "i686-pc-cygwin"...
(gdb) set args cow.osg brian.osg
(gdb) run
Starting program: /usr/local/bin/osgconvd.exe cow.osg brian.osg
Loaded symbols for /cygdrive/c/WINDOWS/system32/ntdll.dll
Loaded symbols for /cygdrive/c/WINDOWS/system32/kernel32.dll
Loaded symbols for /usr/local/bin/cygosgDBd-2.3.7.dll
Loaded symbols for /usr/local/bin/cygOpenThreadsd-2.2.1.dll
Loaded symbols for /usr/bin/cygwin1.dll
Loaded symbols for /cygdrive/c/WINDOWS/system32/advapi32.dll
Loaded symbols for /cygdrive/c/WINDOWS/system32/rpcrt4.dll
Loaded symbols for /cygdrive/c/WINDOWS/system32/secur32.dll
Loaded symbols for /usr/local/bin/cygosgd-2.3.7.dll
Loaded symbols for /cygdrive/c/WINDOWS/system32/glu32.dll
Loaded symbols for /cygdrive/c/WINDOWS/system32/msvcrt.dll
Loaded symbols for /cygdrive/c/WINDOWS/system32/opengl32.dll
Loaded symbols for /cygdrive/c/WINDOWS/system32/gdi32.dll
Loaded symbols for /cygdrive/c/WINDOWS/system32/user32.dll
Loaded symbols for /cygdrive/c/WINDOWS/system32/ddraw.dll
Loaded symbols for /cygdrive/c/WINDOWS/system32/dciman32.dll
Loaded symbols for /usr/local/bin/cygosgUtild-2.3.7.dll
Loaded symbols for /usr/local/bin/cygosgViewerd-2.3.7.dll
Loaded symbols for /usr/local/bin/cygosgGAd-2.3.7.dll
Loaded symbols for /usr/local/bin/cygosgTextd-2.3.7.dll
Data written to 'brian.osg'.
73718546 [main] osgconvd 5648 sig_send: wait for sig_complete event 
failed, sign
al 6, rc 258, Win32 error 0

Program exited with code 03000.
(gdb) thread apply all bt
(gdb) bt
No stack.
(gdb)




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