PythonExtra/tests/thread/thread_lock3.py
David Lechner 3dc324d3f1 tests: Format all Python code with black, except tests in basics subdir.
This adds the Python files in the tests/ directory to be formatted with
./tools/codeformat.py.  The basics/ subdirectory is excluded for now so we
aren't changing too much at once.

In a few places `# fmt: off`/`# fmt: on` was used where the code had
special formatting for readability or where the test was actually testing
the specific formatting.
2020-03-30 13:21:58 +11:00

30 lines
570 B
Python

# test thread coordination using a lock object
#
# MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd
import _thread
lock = _thread.allocate_lock()
n_thread = 10
n_finished = 0
def thread_entry(idx):
global n_finished
while True:
with lock:
if n_finished == idx:
break
print("my turn:", idx)
with lock:
n_finished += 1
# spawn threads
for i in range(n_thread):
_thread.start_new_thread(thread_entry, (i,))
# busy wait for threads to finish
while n_finished < n_thread:
pass