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

0 vote231 views1 answer
Give columns while reading csv
Python
-1 vote241 views1 answer
Groupby where only
Python
0 vote256 views1 answer
To visualize the correlation between any two columns | scatter plot graph
Python
6 votes235 views6 answers
Suicide
Python
0 vote244 views1 answer
Flask remove file after send_file
Python
0 vote249 views1 answer
Left join two dataframes pandas on two different column names
Python
0 vote259 views1 answer
Binary table dataframe
Python
1 vote248 views1 answer
Não nulo pandas
Python
7 votes261 views2 answers
Trim multiple spaces in python
Python
0 vote227 views1 answer
Change python version in jupyter notebook
Python