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mutate_set.py

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# test concurrent mutating access to a shared set object

#

# SPDX-FileCopyrightText: Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd

#

# SPDX-License-Identifier: MIT

import _thread

# the shared set

se = set([-1, -2, -3, -4])

# main thread function

def th(n, lo, hi):

for repeat in range(n):

for i in range(lo, hi):

se.add(i)

assert i in se

se.remove(i)

assert i not in se

with lock:

global n_finished

n_finished += 1

lock = _thread.allocate_lock()

n_thread = 4

n_finished = 0

# spawn threads

for i in range(n_thread):

_thread.start_new_thread(th, (50, i * 500, (i + 1) * 500))

# busy wait for threads to finish

while n_finished < n_thread:

pass

# check set has correct contents

print(sorted(se))