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

#

# MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd

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 = 0

n_thread_max = 2

n_finished = 0

# the shared data structure

tup = (1, 2, 3, 4)

# spawn threads

for _ in range(n_thread_max):

try:

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

n_thread += 1

except OSError:

# System cannot create a new thead, so stop trying to create them.

break

# also run the function on this main thread

thread_entry(100, tup)

n_thread += 1

# busy wait for threads to finish

while n_finished < n_thread:

pass

print(tup)