| # Very rudimentary test of threading module |
| |
| import test.test_support |
| from test.test_support import verbose |
| import random |
| import sys |
| import threading |
| import thread |
| import time |
| import unittest |
| |
| # A trivial mutable counter. |
| class Counter(object): |
| def __init__(self): |
| self.value = 0 |
| def inc(self): |
| self.value += 1 |
| def dec(self): |
| self.value -= 1 |
| def get(self): |
| return self.value |
| |
| class TestThread(threading.Thread): |
| def __init__(self, name, testcase, sema, mutex, nrunning): |
| threading.Thread.__init__(self, name=name) |
| self.testcase = testcase |
| self.sema = sema |
| self.mutex = mutex |
| self.nrunning = nrunning |
| |
| def run(self): |
| delay = random.random() * 2 |
| if verbose: |
| print('task', self.getName(), 'will run for', delay, 'sec') |
| |
| self.sema.acquire() |
| |
| self.mutex.acquire() |
| self.nrunning.inc() |
| if verbose: |
| print(self.nrunning.get(), 'tasks are running') |
| self.testcase.assert_(self.nrunning.get() <= 3) |
| self.mutex.release() |
| |
| time.sleep(delay) |
| if verbose: |
| print('task', self.getName(), 'done') |
| |
| self.mutex.acquire() |
| self.nrunning.dec() |
| self.testcase.assert_(self.nrunning.get() >= 0) |
| if verbose: |
| print(self.getName(), 'is finished.', self.nrunning.get(), \ |
| 'tasks are running') |
| self.mutex.release() |
| |
| self.sema.release() |
| |
| class ThreadTests(unittest.TestCase): |
| |
| # Create a bunch of threads, let each do some work, wait until all are |
| # done. |
| def test_various_ops(self): |
| # 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() |
| numrunning = Counter() |
| |
| threads = [] |
| |
| for i in range(NUMTASKS): |
| t = TestThread("<thread %d>"%i, self, sema, mutex, numrunning) |
| threads.append(t) |
| t.start() |
| |
| if verbose: |
| print('waiting for all tasks to complete') |
| for t in threads: |
| t.join(NUMTASKS) |
| self.assert_(not t.isAlive()) |
| if verbose: |
| print('all tasks done') |
| self.assertEqual(numrunning.get(), 0) |
| |
| # run with a small(ish) thread stack size (256kB) |
| def test_various_ops_small_stack(self): |
| if verbose: |
| print('with 256kB thread stack size...') |
| try: |
| threading.stack_size(262144) |
| except thread.error: |
| if verbose: |
| print('platform does not support changing thread stack size') |
| return |
| self.test_various_ops() |
| threading.stack_size(0) |
| |
| # run with a large thread stack size (1MB) |
| def test_various_ops_large_stack(self): |
| if verbose: |
| print('with 1MB thread stack size...') |
| try: |
| threading.stack_size(0x100000) |
| except thread.error: |
| if verbose: |
| print('platform does not support changing thread stack size') |
| return |
| self.test_various_ops() |
| threading.stack_size(0) |
| |
| def test_foreign_thread(self): |
| # Check that a "foreign" thread can use the threading module. |
| def f(mutex): |
| # Acquiring an RLock forces an entry for the foreign |
| # thread to get made in the threading._active map. |
| r = threading.RLock() |
| r.acquire() |
| r.release() |
| mutex.release() |
| |
| mutex = threading.Lock() |
| mutex.acquire() |
| tid = thread.start_new_thread(f, (mutex,)) |
| # Wait for the thread to finish. |
| mutex.acquire() |
| self.assert_(tid in threading._active) |
| self.assert_(isinstance(threading._active[tid], |
| threading._DummyThread)) |
| del threading._active[tid] |
| |
| # PyThreadState_SetAsyncExc() is a CPython-only gimmick, not (currently) |
| # exposed at the Python level. This test relies on ctypes to get at it. |
| def test_PyThreadState_SetAsyncExc(self): |
| try: |
| import ctypes |
| except ImportError: |
| if verbose: |
| print("test_PyThreadState_SetAsyncExc can't import ctypes") |
| return # can't do anything |
| |
| set_async_exc = ctypes.pythonapi.PyThreadState_SetAsyncExc |
| |
| class AsyncExc(Exception): |
| pass |
| |
| exception = ctypes.py_object(AsyncExc) |
| |
| # `worker_started` is set by the thread when it's inside a try/except |
| # block waiting to catch the asynchronously set AsyncExc exception. |
| # `worker_saw_exception` is set by the thread upon catching that |
| # exception. |
| worker_started = threading.Event() |
| worker_saw_exception = threading.Event() |
| |
| class Worker(threading.Thread): |
| def run(self): |
| self.id = thread.get_ident() |
| self.finished = False |
| |
| try: |
| while True: |
| worker_started.set() |
| time.sleep(0.1) |
| except AsyncExc: |
| self.finished = True |
| worker_saw_exception.set() |
| |
| t = Worker() |
| t.setDaemon(True) # so if this fails, we don't hang Python at shutdown |
| t.start() |
| if verbose: |
| print(" started worker thread") |
| |
| # Try a thread id that doesn't make sense. |
| if verbose: |
| print(" trying nonsensical thread id") |
| result = set_async_exc(ctypes.c_long(-1), exception) |
| self.assertEqual(result, 0) # no thread states modified |
| |
| # Now raise an exception in the worker thread. |
| if verbose: |
| print(" waiting for worker thread to get started") |
| worker_started.wait() |
| if verbose: |
| print(" verifying worker hasn't exited") |
| self.assert_(not t.finished) |
| if verbose: |
| print(" attempting to raise asynch exception in worker") |
| result = set_async_exc(ctypes.c_long(t.id), exception) |
| self.assertEqual(result, 1) # one thread state modified |
| if verbose: |
| print(" waiting for worker to say it caught the exception") |
| worker_saw_exception.wait(timeout=10) |
| self.assert_(t.finished) |
| if verbose: |
| print(" all OK -- joining worker") |
| if t.finished: |
| t.join() |
| # else the thread is still running, and we have no way to kill it |
| |
| class ThreadingExceptionTests(unittest.TestCase): |
| # A RuntimeError should be raised if Thread.start() is called |
| # multiple times. |
| def test_start_thread_again(self): |
| thread = threading.Thread() |
| thread.start() |
| self.assertRaises(RuntimeError, thread.start) |
| |
| def test_releasing_unacquired_rlock(self): |
| rlock = threading.RLock() |
| self.assertRaises(RuntimeError, rlock.release) |
| |
| def test_waiting_on_unacquired_condition(self): |
| cond = threading.Condition() |
| self.assertRaises(RuntimeError, cond.wait) |
| |
| def test_notify_on_unacquired_condition(self): |
| cond = threading.Condition() |
| self.assertRaises(RuntimeError, cond.notify) |
| |
| def test_semaphore_with_negative_value(self): |
| self.assertRaises(ValueError, threading.Semaphore, value = -1) |
| self.assertRaises(ValueError, threading.Semaphore, value = -sys.maxint) |
| |
| def test_joining_current_thread(self): |
| currentThread = threading.currentThread() |
| self.assertRaises(RuntimeError, currentThread.join); |
| |
| def test_joining_inactive_thread(self): |
| thread = threading.Thread() |
| self.assertRaises(RuntimeError, thread.join) |
| |
| def test_daemonize_active_thread(self): |
| thread = threading.Thread() |
| thread.start() |
| self.assertRaises(RuntimeError, thread.setDaemon, True) |
| |
| |
| def test_main(): |
| test.test_support.run_unittest(ThreadTests, |
| ThreadingExceptionTests) |
| |
| if __name__ == "__main__": |
| test_main() |