Are Generators Threadsafe?

Question

I have a multithreaded program where I create a generator function and then pass it to new threads. I want it to be shared/global in nature so each thread can get the next

Answer 1

Courtesy of IIRC python freenode, here is a working solutions for python 3.x

Generators are not thread safe by default, but heres how to make them to be thread safe

def my_generator():
    while True:
        for x in range(10):
            yield x

---

class LockedIterator(object):
    def __init__(self, it):
        self._lock = threading.Lock()
        self._it = iter(it)

    def __iter__(self):
        return self

    def __next__(self):
        with self._lock:
            return next(self._it)

n = LockedIterator(my_generator)

next(n)
next(n)
next(n)

OR use a function

def threadsafe_iter(iterable):
    lock = threading.Lock()
    iterator = iter(iterable)
    while True:
        with lock:
            for value in iterator:
                break
            else:
                return
        yield value

n = threadsafe_iter(my_generator)

next(n)
next(n)
next(n)