tests/thread: Add tests that mutate shared objects.

Tests concurrent mutating access to: list, dict, set, bytearray.
This commit is contained in:
Damien George 2016-05-17 10:54:41 +00:00
parent c73cf9d931
commit 094a0dd11a
4 changed files with 167 additions and 0 deletions

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# test concurrent mutating access to a shared bytearray object
#
# MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd
import _thread
# the shared bytearray
ba = bytearray()
# main thread function
def th(n, lo, hi):
for repeat in range(n):
for i in range(lo, hi):
l = len(ba)
ba.append(i)
assert len(ba) >= l + 1
l = len(ba)
ba.extend(bytearray([i]))
assert len(ba) >= l + 1
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, (40, i * 256 // n_thread, (i + 1) * 256 // n_thread))
# busy wait for threads to finish
while n_finished < n_thread:
pass
# check bytearray has correct contents
print(len(ba))
count = [0 for _ in range(256)]
for b in ba:
count[b] += 1
print(count)

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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()))

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# test concurrent mutating access to a shared list object
#
# MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd
import _thread
# the shared list
li = list()
# main thread function
def th(n, lo, hi):
for repeat in range(n):
for i in range(lo, hi):
li.append(i)
assert li.count(i) == repeat + 1
li.extend([i, i])
assert li.count(i) == repeat + 3
li.remove(i)
assert li.count(i) == repeat + 2
li.remove(i)
assert li.count(i) == repeat + 1
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, (4, i * 60, (i + 1) * 60))
# busy wait for threads to finish
while n_finished < n_thread:
pass
# check list has correct contents
li.sort()
print(li)

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# test concurrent mutating access to a shared set object
#
# MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd
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))