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 siddacious-patch-1

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thread_shared2.py

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

# (without contention because they access different parts of the structure)

#

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

import _thread

def foo(lst, i):

lst[i] += 1

def thread_entry(n, lst, idx):

for i in range(n):

foo(lst, idx)

with lock:

global n_finished

n_finished += 1

lock = _thread.allocate_lock()

n_thread = 2

n_finished = 0

# the shared data structure

lst = [0, 0]

# spawn threads

for i in range(n_thread):

_thread.start_new_thread(thread_entry, ((i + 1) * 10, lst, i))

# busy wait for threads to finish

while n_finished < n_thread:

pass

print(lst)