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Programming
Multithreading in Pro*C
Post 10558 by rwb1959 on Friday 16th of November 2001 08:44:32 AM
11-16-2001
dbx should work for you. You can even
execute the program via dbx and set break points
to allow you to step through the segment of code
and "watch" the variable in question. However,
multithreaded programs tend to be more difficult
to "step" through and in many cases that I have
observed personally, the code will not fail
when executed from the debugger
I would recommend a couple of things...
I would first add signal handling to catch
the signal (I assume you are getting a SEGV or
Segmentation fault type of error). This will
at least allow you to "control" the fault
detection to allow your program to "clean up"
then you can all "abort()" to dump a core image
if you like. Also, I would go to the
"old fashioned" way of what I like to call
"brute force" debugging. I would add logging
code around the sections of code that assign
values to this variable (be sure to "flush()" the
output to the log before moving on to the next
statement). Also, make sure that the Oracle
libraries and any shared libraries that you use
on the production machine are the same version
as your development environment.
Another thing to try, is if you can build the
code completely with "static" libraries, do that.
It may also help to post the "exact" system
error message. I assuming it's a SEGV error
which typically indicates stack corruption which
can easily happen if the bounds of an array are
exceeded but seeing the error would verify this
assumption.
execute the program via dbx and set break points
to allow you to step through the segment of code
and "watch" the variable in question. However,
multithreaded programs tend to be more difficult
to "step" through and in many cases that I have
observed personally, the code will not fail
when executed from the debugger
I would recommend a couple of things...
I would first add signal handling to catch
the signal (I assume you are getting a SEGV or
Segmentation fault type of error). This will
at least allow you to "control" the fault
detection to allow your program to "clean up"
then you can all "abort()" to dump a core image
if you like. Also, I would go to the
"old fashioned" way of what I like to call
"brute force" debugging. I would add logging
code around the sections of code that assign
values to this variable (be sure to "flush()" the
output to the log before moving on to the next
statement). Also, make sure that the Oracle
libraries and any shared libraries that you use
on the production machine are the same version
as your development environment.
Another thing to try, is if you can build the
code completely with "static" libraries, do that.
It may also help to post the "exact" system
error message. I assuming it's a SEGV error
which typically indicates stack corruption which
can easily happen if the bounds of an array are
exceeded but seeing the error would verify this
assumption.
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LEARN ABOUT BSD
crash
CRASH(L) CRASH(L) NAME
crash - analyze kernel dump or active system image SYNOPSIS
crash [ aps ] [ -bdvtiz ] [ -s sfile ] [ -c cfile ] [ -u addr ] DESCRIPTION
Synopsis of options - -b Brief mode; skip general display of processes -d Crash dump contains swap image. (default?) -v Verbose; dump much information about each proc [future] -t TTY structs to be dumpped -i Incore inode table to be printed -c FILE Provide non-standard file name for system image input -s FILE Provide non-standard symboltable input -u ADDR Trace a process other than currently selected one -z Interrupt Trace displayed aps Print PS & PC at time of interupt (doesn't do anything) crash examines a dump of unix which it looks for in the file sysdump. It prints out the contents of the general registers, the kernel stack and a traceback through the kernel stack. If an aps is specified, the ps and pc at time of interrupt are also printed out. The dump of the stack commences from a "reasonable" address and all addresses are relocated to virtual addresses by using the value of kdsa6 found in the dump. The following options may be specified. -b Brief mode; skip general display of processes. Only the currently selected process will be traced. -c cfile If the -c argument is found, the following argument is taken to be the name of a file containing the system image. The default is "/usr/sys/core". -s sfile If the -s argument is found the following argument is taken to be the name of a file, containing a symbol table which should be used in interpreting text addresses. The default is "/unix". -u addr Force a process to be displayed as if it were active when the crash occurred. addr is the octal address of the proc table entry. FILES
/unix system namelist /dev/swap swap device /usr/sys/core core file SEE ALSO
crash(8), adb(1), ps(1), rstat(1) DIAGNOSTICS
Missing arg Unable to Open file Format Error in symbolfile BUGS
Care should be used in running crash on "/dev/mem". Things can change while crash is running; the picture it gives is only a close approx- imation to reality. AUTHOR
Mike Muuss, JHU EE John Stewart, Teledyne Geotech March 1983 CRASH(L)