John Dickinson wrote:
> Maybe I'm a little dense here, but I'm not seeing why os.chdir is such a
> bad thing in a threaded environment. I did a little google-ing, but I
> did not find anything the was talking about problems in a threaded
> environment.
The following program shows the problem quite clearly:
----------------------------
from os import mkdir, chdir
from time import sleep
from threading import Thread
try:
# make test dirs
mkdir('dir1')
mkdir('dir1/dir2')
open('dir1/test', 'w').write('inside dir1')
open('dir1/dir2/test', 'w').write('inside dir2')
except:
pass
def thread1():
chdir('dir1')
sleep(0.2)
print "test file in dir1:", open('test').read()
def thread2():
sleep(0.1)
chdir('dir2')
Thread(target=thread1).start()
Thread(target=thread2).start()
----------------------------
From looking at the thread1 function, you would expect "inside dir1" as
output, but because thread2 is interfering, it prints "inside dir2".
I have added the sleep calls to make the behavior predictable. In a real
threaded environment, the output would be unpredictable.
-- Chris
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