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May 17, 2018 05:28
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Dining philosopher's problem.
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| import threading | |
| import time | |
| import logging | |
| logging.basicConfig( | |
| format='%(threadName)s: %(message)s', level=logging.DEBUG) | |
| logger = logging.getLogger(__name__) | |
| n = 5 | |
| forks = [threading.Lock() for _ in range(n)] | |
| def p(i): | |
| j = (i+1) % n | |
| i, j = min(i, j), max(i, j) # without this line, we reach deadlock! | |
| while True: | |
| logger.info('thinking') | |
| time.sleep(0) | |
| logger.info('taking first fork {}'.format(i)) | |
| with forks[i]: | |
| logger.info('took first fork; taking second fork {}'.format(j)) | |
| with forks[j]: | |
| logger.info('took second fork {}; eating'.format(j)) | |
| time.sleep(0) | |
| logger.info('done eating') | |
| if __name__ == '__main__': | |
| for i in range(n): | |
| t = threading.Thread( | |
| name='p-{}'.format(i), target=p, args=(i,)) | |
| t.start() |
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