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//usr/lib/python2.4/test/test_threading.py
# 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 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'