circuitpython/tests/thread/mutate_dict.py

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# test concurrent mutating access to a shared dict object
#
# MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd
import _thread
# the shared dict
di = {"a": "A", "b": "B", "c": "C", "d": "D"}
# main thread function
def th(n, lo, hi):
for repeat in range(n):
for i in range(lo, hi):
di[i] = repeat + i
assert di[i] == repeat + i
del di[i]
assert i not in di
di[i] = repeat + i
assert di[i] == repeat + i
assert di.pop(i) == repeat + i
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, (30, i * 300, (i + 1) * 300))
# busy wait for threads to finish
while n_finished < n_thread:
pass
# check dict has correct contents
print(sorted(di.items()))