How to limit the total number of executions of a multiprocessing script?

Question

Python

The script is run like this:

with Pool(processes=2) as pool:
    for proxy in PROXY_HOST:
        pool.apply_async(registration, (proxy, groups))
    pool.close()
    pool.join()

In this form, it works as long as there are proxies in the list.
I need to limit the number of executions.
1. Passing the status to the database (or any other file) is not an option, because in any case, the thread will be launched - the value in the database will be checked and only then executed/closed.
2. Removing an unnecessary number from the list of proxies is also not suitable, because there may be blocked proxies. That is, for example, I need to make 5 registrations, I add 5 proxies, but 2 of them are blocked, respectively, I will receive only 3 registrations.

Answer 1

You can use Semaphore to control the number of executions.
And by the way, don't close the pool when you use with.

Answer 2

check the result via pool.apply_async(registration, (proxy, groups)).get()
if successful regs >= required amount - break