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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_support import verbose
import random
import threading
import time
# This takes about n/3 seconds to run (about n/3 clumps of tasks, times
# about 1 second per clump).
numtasks = 10
# no more than 3 of the 10 can run at once
sema = threading.BoundedSemaphore(value=3)
mutex = threading.RLock()
running = 0
class TestThread(threading.Thread):
def run(self):
global running
delay = random.random() * 2
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()
threads = []
def starttasks():
for i in range(numtasks):
t = TestThread(name="<thread %d>"%i)
threads.append(t)
t.start()
starttasks()
if verbose:
print 'waiting for all tasks to complete'
for t in threads:
t.join()
if verbose:
print 'all tasks done'
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