Hi there,
trying to get BSF4Rexx 4.0 into beta-test shape (32-bit and 64-bit
Windows and Linux versions). Using developed test units I have been able
to assert that it runs stable, with the exception of employing
multithreading heavily.
"32-bit" means: operating system is 32-bit, hence ooRexx and BSF4Rexx.
Windows is XP SP3, Linux is Ubuntu.
"64-bit" means: operating system is 64-bit, ooRexx is 64-bit and
BSF4Rexx is 64-bit Windows is Vista Business, Linux is Ubuntu.
Multithreading in this context means:
* using multiple Rexx threads, each interfacing with Java using
BSF4Rexx (e.g. 100 Rexx threads per test, in each thread two
invocations of BSF4Rexx),
* using multiple Java threads, which each uses the same Rexx
interpreter instance to run off Rexx scripts that themselves
dispatch multiple Rexx threads, all (Java and Rexx code)
interfacing with each other using BSF4Rexx (e.g. 23 Java threads,
each running a Rexx script that creates 29 Rexx threads; summing
up all threads gives 712 threads, a heavy version may use a total
of 2,601 threads),
* there are individual Java objects that Rexx interacts with via
BSF4Rexx,
* there are individual Rexx objects that Java interacts with via
BSF4Rexx; access to these Rexx objects may be concurrently from
Rexx threads and Java threads, where the latter get routed via
BSF4Rexx.
Here are three issues where I would to ask for advice, ideas:
* Scenario 1: 32-bit Windows (not tested on 64-bit Windows),
exception in "rexx.exe":
o Here I may get the following exception
o
> rexx.dll!00337328()
[Frames below may be incorrect and/or missing, no symbols
loaded for rexx.dll]
rexx.dll!002ff218()
rexx.dll!002e9490()
rexx.dll!00303462()
rexx.dll!003473c9()
kernel32.dll!7c80b729()
Unhandled exception at 0x00337328 in rexx.exe: 0xC0000005: Access
violation reading location 0x0000000c.
or:
> rexx.dll!002e86f8()
[Frames below may be incorrect and/or missing, no symbols
loaded for rexx.dll]
rexx.dll!002e880b()
rexx.dll!002e9438()
rexx.dll!0030d2ae()
rexx.dll!00318639()
BSF4Rexx.dll!00c44269()
Unhandled exception at 0x002e86f8 in rexx.exe: 0xC0000005: Access
violation reading location 0x028fd522.
* Scneario 2: 64-bit Linux, *"buffer overflow"*: ran the same tests
as above and in the multithreaded test unit I get a
non-redirectable output in the shell reading:
o
r...@ronylinux:/mnt/root_e/rony/dev/bsf/src/source_cc_40/testUnits$
rexx testOORexx -R bsf4rexx -s 2>&1 | gvim -
Vim: Reading from stdin...
**** buffer overflow detected ***: rexx terminated*
======= Backtrace: =========
/lib/libc.so.6(__fortify_fail+0x37)[0x7fb7374ee2c7]
/lib/libc.so.6[0x7fb7374ec170]
/lib/libc.so.6[0x7fb7374eb519]
/lib/libc.so.6(_IO_default_xsputn+0x96)[0x7fb737465426]
/lib/libc.so.6(_IO_vfprintf+0x348d)[0x7fb737437e2d]
/lib/libc.so.6(__vsprintf_chk+0x99)[0x7fb7374eb5b9]
/lib/libc.so.6(__sprintf_chk+0x80)[0x7fb7374eb500]
/mnt/root_e/rony/dev/bsf/src/bsf4rexx/libBSF4Rexx.so(BSF_impl+0x348)[0x7fb734d90fb8]
/mnt/root_e/rony/dev/bsf/src/bsf4rexx/libBSF4Rexx.so(BSF+0x21)[0x7fb734d914e1]
/opt/ooRexx/lib/ooRexx/librexx.so.4(_ZN20RexxNativeActivation17callNativeRoutineEP12RoutineClassP17RexxNativeRoutineP10RexxStringPP10RexxObjectmR15ProtectedObject+0xc2)[0x7fb738634e12]
/opt/ooRexx/lib/ooRexx/librexx.so.4(_ZN12RoutineClass4callEP12RexxActivityP10RexxStringPP10RexxObjectmR15ProtectedObject+0x55)[0x7fb738607495]
/opt/ooRexx/lib/ooRexx/librexx.so.4(_ZN14PackageManager17callNativeRoutineEP12RexxActivityP10RexxStringPP10RexxObjectmR15ProtectedObject+0x62)[0x7fb73864bca2]
/opt/ooRexx/lib/ooRexx/librexx.so.4(_ZN17SystemInterpreter22invokeExternalFunctionEP14RexxActivationP12RexxActivityP10RexxStringPP10RexxObjectmS5_R15ProtectedObject+0x9e)[0x7fb73867e4fe]
/opt/ooRexx/lib/ooRexx/librexx.so.4(_ZN14RexxActivation12externalCallEP10RexxStringmP19RexxExpressionStackS1_R15ProtectedObject+0x13a)[0x7fb738629aba]
/opt/ooRexx/lib/ooRexx/librexx.so.4(_ZN22RexxExpressionFunction8evaluateEP14RexxActivationP19RexxExpressionStack+0x243)[0x7fb73865a003]
/opt/ooRexx/lib/ooRexx/librexx.so.4(_ZN21RexxExpressionMessage8evaluateEP14RexxActivationP19RexxExpressionStack+0x59)[0x7fb73865ac29]
... cut ...
======= Memory map: ========
00400000-00401000 r-xp 00000000 08:01 24936487
/opt/ooRexx/bin/rr...@ronylinux:/mnt/root_e/rony/dev/bsf/src/source_cc_r...@ronylinux:/mnt/root_e/rony/dev/bsf/src/source_cc_40/testUnits$
* Scenario 3: only on 32- and 64-bit Linux, not on Windows:
o all "regular" test units and examples that use the new
callback from Java to Rexx mechanism work with one sole
exception: that exception, if it occurs will always occur on
the Java "awt-thread", which AFAIK is special in Java as it
interfaces directly with the operating system/graphic
system. This example extends an abstract Java class and uses
a Rexx object's method as its implementation (this in
principle works for all examples, tests and experiments,
even the most stressing ones, such that I have come to
believe that the basic implementation works bullet-proofly,
just not in this special awt-case on Linux). Again this
example works reliably on Windows 32- and 64-bit.
Java tells me that the problem lies in BSF4Rexx, however
after having traced it down (BSF4Rexx currently consists of
more conditional debug code then real code, it seems to me
:( ) the spot where the exception gets thrown is right at
invoking a JNI-function, invoking NewObjectArray() and
making sure that all arguments have a meaningful/valid
value! So after thinking about it, it looks as if something
goes wrong right there switching to JNI, where the JNI
watching code assumes the problem is is right there, but in
BSF4Rexx.
Now having thrown a lot of resources, efforts and time against this area
in order to figure out the places where the errors occur, and then go on
to find a pattern, in order to become able to locate the cause of the
problem and fix it.
However, in these three occurrences I am stucked at the moment and would
like to ask about insights, theories (could the operating system,
ooRexx, Java, JNI be culprits here too?) and ideas what may cause this
and how one could/should tackle and solve them.
TIA,
---rony
------------------------------------------------------------------------------
Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
trial. Simplify your report design, integration and deployment - and focus on
what you do best, core application coding. Discover what's new with
Crystal Reports now. http://p.sf.net/sfu/bobj-july
_______________________________________________
Oorexx-devel mailing list
Oorexx-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/oorexx-devel
