java crashes in python thread

[Easeway]

I use os.system invoking java VM, when running in python thread,
the java application crashes. But it works properly when thread is
not used.

Has any body come across with this problem?

Python 2.3.3
J2SDK 1.4.2_05
SuSE Linux Enterprise Server 9

The following is source file:
#!/usr/bin/env python

import os, sys, threading

class ThreadTask(threading.Thread) :

def __init__(self, shellcmd) :
threading.Thread.__init__(self)
self.command = shellcmd

def isStopped(self) :
self.join(0.01)
return not self.isAlive()

def run(self) :
os.system(self.command)

def test() :
commands = [
"/usr/lib/java/bin/javac",
"/usr/lib/java/bin/java",
]
tasks = []
for a in commands :
tasks.append(ThreadTask(a))

for a in tasks :
a.start()

endcnt = 0
while endcnt < len(tasks) :
endcnt = 0
for a in tasks :
if a.isStopped() : endcnt += 1
print("DONE")

test()

 

[Peter Hansen]

I use os.system invoking java VM, when running in python thread,
the java application crashes.

Can you define "crash" more precisely? Isn't there any
kind of error message/traceback that would reveal more
information about the problem?

Also, how quickly do you get this crash? Instantly,
shortly after starting, a long time after starting,
at completion of the Java processes (maybe check to
see whether the entire javac has executed, or some
other sign of completion), or ?

-Peter

 

[Dieter Maurer]

I use os.system invoking java VM, when running in python thread, the
java application crashes.

Andreas Jung has reported similar behaviour.

He suggested that Java 1.4 and the threads of Linux 2.6
do not work reliably together.
He tried Java 1.5 and this combination crashes only occationally.
But this, it is not yet reliable...

Dieter