Bryan Olson <[EMAIL PROTECTED]> writes:
> I have not found definitive answers in the Python doc. Both
> generators and threads keep their own line-of-control, and
> how they interact is not clear.
It looks to me like you can't have two threads in the same generator:
import threading, time
def make_gen():
lock = threading.Lock()
count = 0
delay = [0,1]
while True:
lock.acquire()
# sleep 1 sec on first iteration, then 0 seconds on next iteration
time.sleep(delay.pop())
count += 1
yield count
lock.release()
def run():
print gen.next()
gen = make_gen()
# start a thread that will lock the generator for 1 sec
threading.Thread(target=run).start()
# make sure first thread has a chance to get started
time.sleep(0.2)
# start second thread while the generator is locked
threading.Thread(target=run).start()
raises ValueError:
Python 2.3.4 (#1, Feb 2 2005, 12:11:53)
[GCC 3.4.2 20041017 (Red Hat 3.4.2-6.fc3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> ## working on region in file /usr/tmp/python-28906xpZ...
>>> Exception in thread Thread-2:
Traceback (most recent call last):
File "/usr/lib/python2.3/threading.py", line 436, in __bootstrap
self.run()
File "/usr/lib/python2.3/threading.py", line 416, in run
self.__target(*self.__args, **self.__kwargs)
File "/usr/tmp/python-28906xpZ", line 18, in run
ValueError: generator already executing
1
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