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# This test ensures that the scheduler doesn't trigger any assertions
# while dealing with concurrent access from multiple threads.
import _thread
import time
import micropython
import gc
try:
micropython.schedule
except AttributeError:
print("SKIP")
raise SystemExit
gc.disable()
_NUM_TASKS = 10000
_TIMEOUT_MS = 10000
n = 0 # How many times the task successfully ran.
t = None # Start time of test, assigned here to preallocate entry in globals dict.
thread_run = True # If the thread should continue running.
def task(x):
global n
n += 1
def thread():
while thread_run:
try:
micropython.schedule(task, None)
except RuntimeError:
# Queue full, back off.
time.sleep_ms(10)
for i in range(8):
try:
_thread.start_new_thread(thread, ())
except OSError:
# System cannot create a new thead, so stop trying to create them.
break
# Wait up to 10 seconds for 10000 tasks to be scheduled.
t = time.ticks_ms()
while n < _NUM_TASKS and time.ticks_diff(time.ticks_ms(), t) < _TIMEOUT_MS:
pass
# Stop all threads.
thread_run = False
time.sleep_ms(20)
gc.enable()
if n < _NUM_TASKS:
# Not all the tasks were scheduled, likely the scheduler stopped working.
print(n)
else:
print("PASS")
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