/Lib/test/test_thread.py
http://unladen-swallow.googlecode.com/ · Python · 168 lines · 127 code · 32 blank · 9 comment · 25 complexity · 85425d42f9b91ae6c9cd747663ccb02f MD5 · raw file
- import os
- import unittest
- import random
- from test import test_support
- import thread
- import time
- NUMTASKS = 10
- NUMTRIPS = 3
- _print_mutex = thread.allocate_lock()
- def verbose_print(arg):
- """Helper function for printing out debugging output."""
- if test_support.verbose:
- with _print_mutex:
- print arg
- class BasicThreadTest(unittest.TestCase):
- def setUp(self):
- self.done_mutex = thread.allocate_lock()
- self.done_mutex.acquire()
- self.running_mutex = thread.allocate_lock()
- self.random_mutex = thread.allocate_lock()
- self.running = 0
- self.next_ident = 0
- class ThreadRunningTests(BasicThreadTest):
- def newtask(self):
- with self.running_mutex:
- self.next_ident += 1
- verbose_print("creating task %s" % self.next_ident)
- thread.start_new_thread(self.task, (self.next_ident,))
- self.running += 1
- def task(self, ident):
- with self.random_mutex:
- delay = random.random() / 10000.0
- verbose_print("task %s will run for %sus" % (ident, round(delay*1e6)))
- time.sleep(delay)
- verbose_print("task %s done" % ident)
- with self.running_mutex:
- self.running -= 1
- if self.running == 0:
- self.done_mutex.release()
- def test_starting_threads(self):
- # Basic test for thread creation.
- for i in range(NUMTASKS):
- self.newtask()
- verbose_print("waiting for tasks to complete...")
- self.done_mutex.acquire()
- verbose_print("all tasks done")
- def test_stack_size(self):
- # Various stack size tests.
- self.assertEquals(thread.stack_size(), 0, "intial stack size is not 0")
- thread.stack_size(0)
- self.assertEquals(thread.stack_size(), 0, "stack_size not reset to default")
- if os.name not in ("nt", "os2", "posix"):
- return
- tss_supported = True
- try:
- thread.stack_size(4096)
- except ValueError:
- verbose_print("caught expected ValueError setting "
- "stack_size(4096)")
- except thread.error:
- tss_supported = False
- verbose_print("platform does not support changing thread stack "
- "size")
- if tss_supported:
- fail_msg = "stack_size(%d) failed - should succeed"
- for tss in (262144, 0x100000, 0):
- thread.stack_size(tss)
- self.assertEquals(thread.stack_size(), tss, fail_msg % tss)
- verbose_print("successfully set stack_size(%d)" % tss)
- for tss in (262144, 0x100000):
- verbose_print("trying stack_size = (%d)" % tss)
- self.next_ident = 0
- for i in range(NUMTASKS):
- self.newtask()
- verbose_print("waiting for all tasks to complete")
- self.done_mutex.acquire()
- verbose_print("all tasks done")
- thread.stack_size(0)
- class Barrier:
- def __init__(self, num_threads):
- self.num_threads = num_threads
- self.waiting = 0
- self.checkin_mutex = thread.allocate_lock()
- self.checkout_mutex = thread.allocate_lock()
- self.checkout_mutex.acquire()
- def enter(self):
- self.checkin_mutex.acquire()
- self.waiting = self.waiting + 1
- if self.waiting == self.num_threads:
- self.waiting = self.num_threads - 1
- self.checkout_mutex.release()
- return
- self.checkin_mutex.release()
- self.checkout_mutex.acquire()
- self.waiting = self.waiting - 1
- if self.waiting == 0:
- self.checkin_mutex.release()
- return
- self.checkout_mutex.release()
- class BarrierTest(BasicThreadTest):
- def test_barrier(self):
- self.bar = Barrier(NUMTASKS)
- self.running = NUMTASKS
- for i in range(NUMTASKS):
- thread.start_new_thread(self.task2, (i,))
- verbose_print("waiting for tasks to end")
- self.done_mutex.acquire()
- verbose_print("tasks done")
- def task2(self, ident):
- for i in range(NUMTRIPS):
- if ident == 0:
- # give it a good chance to enter the next
- # barrier before the others are all out
- # of the current one
- delay = 0
- else:
- with self.random_mutex:
- delay = random.random() / 10000.0
- verbose_print("task %s will run for %sus" %
- (ident, round(delay * 1e6)))
- time.sleep(delay)
- verbose_print("task %s entering %s" % (ident, i))
- self.bar.enter()
- verbose_print("task %s leaving barrier" % ident)
- with self.running_mutex:
- self.running -= 1
- # Must release mutex before releasing done, else the main thread can
- # exit and set mutex to None as part of global teardown; then
- # mutex.release() raises AttributeError.
- finished = self.running == 0
- if finished:
- self.done_mutex.release()
- def test_main():
- test_support.run_unittest(ThreadRunningTests, BarrierTest)
- if __name__ == "__main__":
- test_main()