I want to create a Python context manager to act as a controlled sort of "library" that lends out objects, and then takes them back when the scope of the with statement exits.
In psuedo-code I was thinking something like this:
class Library:
def __init__(self):
self.lib = [1,2,3,4]
self.lock = Condition(Lock())
def __enter__(self):
with self.lock:
# Somehow keep track of this object-thread association
if len(self.lib) > 0:
return self.lib.pop()
else:
self.lock.wait()
return self.lib.pop()
def __exit__(self):
with self.lock:
# Push the object that the calling thread obtained with
# __enter__() back into the array
self.lock.notify()
