Created
February 7, 2020 18:52
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| from concurrent.futures import ThreadPoolExecutor | |
| import csv | |
| import numpy as np | |
| from functools import partial | |
| import random | |
| import threading | |
| import time | |
| filename = 'lock_writes.csv' | |
| def thread_function(lock, id): | |
| with lock: | |
| pause = random.randint(1, 5) / 10 | |
| print(id, ' - ', pause) | |
| time.sleep(pause) | |
| with open(filename, 'a') as csvfile: | |
| csvwriter = csv.writer(csvfile) | |
| csvwriter.writerow([threading.get_ident(), id]) | |
| filename_no_lock = 'no_lock_writes.csv' | |
| def thread_function_no_lock(id): | |
| pause = random.randint(1, 5) / 10 | |
| print(id, ' - ', pause) | |
| time.sleep(pause) | |
| with open(filename_no_lock, 'a') as csvfile: | |
| csvwriter = csv.writer(csvfile) | |
| csvwriter.writerow([threading.get_ident(), id]) | |
| global_lock = threading.Lock() | |
| with open(filename, 'a') as csvfile: | |
| csvwriter = csv.writer(csvfile) | |
| csvwriter.writerow(['thread_id', 'id']) | |
| thread_function_with_lock = partial(thread_function, global_lock) | |
| with ThreadPoolExecutor(3) as ex: | |
| ex.map(thread_function_with_lock, range(9)) | |
| with open(filename_no_lock, 'a') as csvfile: | |
| csvwriter = csv.writer(csvfile) | |
| csvwriter.writerow(['thread_id', 'id']) | |
| with ThreadPoolExecutor(3) as ex: | |
| ex.map(thread_function_no_lock, range(9)) |
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