Hello,
I've seen many messages and bug reports on popen2 about pipes, buffer
size problems, sub-processes not properly closed, race conditions,
popen2 not being thread safe... But I still can't figure what applies
to my case.
This piece of code:
#!/usr/bin/python
import threading
import popen2
class MyThread ( threading.Thread ):
def run ( self ):
#popenChild = popen2.Popen3("cat /etc/passwd")
#popenChild = popen2.Popen3("/usr/bin/iostat -V")
popenChild = popen2.Popen3("/usr/bin/iostat -k -x 1 2")
popenChild.wait()
print 'Bye'
MyThread().start()
Works fine on RHEL5/python 2.4.3
Hangs on RHEL4/python 2.3.4
I presume it hangs on wait().
It does not hang with:
popenChild = popen2.Popen3("/usr/bin/iostat -V") # short output
popenChild = popen2.Popen3("cat /etc/passwd") # long output
It does not hang outside of a thread:
#!/usr/bin/python
import popen2
popenChild = popen2.Popen3("/usr/bin/iostat -k -x 1 2")
#print popenChild.fromchild.readlines()
popenChild.wait()
print 'Bye'
Could someone explain this to me ?
Thanks in advance.
Louis Coilliot
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