grocery_stocker wrote: > On Apr 10, 6:48 am, Peter Otten <__pete...@web.de> wrote: >> grocery_stocker wrote: >> > When I run the following... >> >> > #!/usr/bin/python >> >> > import time >> > import thread >> > import threading >> >> > def get_first_part(string, lock, sleeptime, *args): >> > global counter >> > lock.acquire() >> > try: >> > counter = counter + 1 >> > data = counter >> > print "%s value is %d" % (string, counter) >> > time.sleep(sleeptime) >> > finally: >> > lock.release() >> > return data >> > def get_both_parts(string, lock, sleeptime, *args): >> > global first, second >> > lock.acquire() >> > try: >> > first = get_first_part() >> > second = get_second_part() >> > print "%s values are %d and %d" % (string, first, >> > second) >> > time.sleep(sleeptime) >> > finally: >> > lock.release() >> > return first, second >> > How come RLock isn't working in this example? >> >> When get_both_parts() acquires the lock it invokes get_first_part() which >> tries to acquire the lock. This fails because get_both_parts() does not >> release the lock until after get_first_part() has finished... >> >> Peter > > > i thought a Rlock() (vs a Lock()) was suspposed to get around this > kind of a problem.
Oops, yes. In get_both_parts() try calling get_first_part/get_second_part() with the three necessary arguments... Peter -- http://mail.python.org/mailman/listinfo/python-list
