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# Very rudimentary test of threading module
# Create a bunch of threads, let each do some work, wait until all are done
from test.test_support import verbose
import random
import dummy_threading as _threading
import time
class TestThread(_threading.Thread):
def run(self):
global running
# Uncomment if testing another module, such as the real 'threading'
# module.
#delay = random.random() * 2
delay = 0
if verbose:
print('task', self.getName(), 'will run for', delay, 'sec')
sema.acquire()
mutex.acquire()
running = running + 1
if verbose:
print(running, 'tasks are running')
mutex.release()
time.sleep(delay)
if verbose:
print('task', self.getName(), 'done')
mutex.acquire()
running = running - 1
if verbose:
print(self.getName(), 'is finished.', running, 'tasks are running')
mutex.release()
sema.release()
def starttasks():
for i in range(numtasks):
t = TestThread(name="<thread %d>"%i)
threads.append(t)
t.start()
def test_main():
# This takes about n/3 seconds to run (about n/3 clumps of tasks, times
# about 1 second per clump).
global numtasks
numtasks = 10
# no more than 3 of the 10 can run at once
global sema
sema = _threading.BoundedSemaphore(value=3)
global mutex
mutex = _threading.RLock()
global running
running = 0
global threads
threads = []
starttasks()
if verbose:
print('waiting for all tasks to complete')
for t in threads:
t.join()
if verbose:
print('all tasks done')
if __name__ == '__main__':
test_main()
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