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thread_shared1.py

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# test capability for threads to access a shared immutable data structure

#

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

#

# SPDX-License-Identifier: MIT

import _thread

def foo(i):

pass

def thread_entry(n, tup):

for i in tup:

foo(i)

with lock:

global n_finished

n_finished += 1

lock = _thread.allocate_lock()

n_thread = 2

n_finished = 0

# the shared data structure

tup = (1, 2, 3, 4)

# spawn threads

for i in range(n_thread):

_thread.start_new_thread(thread_entry, (100, tup))

# busy wait for threads to finish

while n_finished < n_thread:

pass

print(tup)