python_syntax_three_semaphore

gistfile1.txt

'''
https://superfastpython.com/asyncio-semaphore/
https://superfastpython.com/thread-semaphore/
https://superfastpython.com/multiprocessing-semaphore-in-python/

There're three versions of Semaphore:
  from asyncio import Semaphore
  from threading import Semaphore
  from multiprocessing import Semaphore

Usage:
'''
import asyncio
semaphore = asyncio.Semaphore(100)	
await semaphore.acquire()
semaphore.release()

import multiprocessing
semaphore = multiprocessing.Semaphore(100)
semaphore.acquire()
semaphore.release()

# Can I use with-statement?
import asyncio

async def some_coroutine():
  async with asyncio.Semaphore(100) as semaphore:
    await semaphore.acquire()
    # ... do something ...
    semaphore.release()
asyncio.run(some_coroutine())