Semaphore example in python

Semaphore in python

import threading

sem = threading.Semaphore() # or sem = threading.Semaphore(value=n)
sem.acquire()
# Your code here
sem.release()

Semaphore example in python

import threading
import time
import logging

logging.basicConfig(level=logging.DEBUG,
                    format='(%(threadName)-9s) %(message)s',)

class ThreadPool(object):
    def __init__(self):
        super(ThreadPool, self).__init__()
        self.active = []
        self.lock = threading.Lock()
    def makeActive(self, name):
        with self.lock:
            self.active.append(name)
            logging.debug('Running: %s', self.active)
    def makeInactive(self, name):
        with self.lock:
            self.active.remove(name)
            logging.debug('Running: %s', self.active)

def f(s, pool):
    logging.debug('Waiting to join the pool')
    with s:
        name = threading.currentThread().getName()
        pool.makeActive(name)
        time.sleep(0.5)
        pool.makeInactive(name)

if __name__ == '__main__':
    pool = ThreadPool()
    s = threading.Semaphore(3)
    for i in range(10):
        t = threading.Thread(target=f, name='thread_'+str(i), args=(s, pool))
        t.start()

Source: bogotobogo.com

Similar codes

-1 vote175 views2 answers
Scrapy shell
Python
0 vote170 views1 answer
Tkinter background image python 3
Python
0 vote171 views1 answer
How to use self.list.setCurrentRow() in pyqt5
Python
0 vote289 views1 answer
Python loop break on keypress
Python
1 vote218 views1 answer
How to change the favicon in flask
Python Flask
1 vote139 views1 answer
Remove keys from array python
Python
2 votes155 views1 answer
Converting a string to a dictionary in python
Python
0 vote169 views1 answer
Remove env variable python
Python
6 votes168 views2 answers
Remove string punctuation python 3
Python
0 vote171 views1 answer
Pandas grid subplots
Python