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import os
import time
import signal
import unittest
import threading
from queue import Queue
from pebble import decorators
from pebble.common import launch_thread
from pebble import synchronized, sighandler
from pebble import waitforthreads, waitforqueues
results = 0
semaphore = threading.Semaphore()
@synchronized
def synchronized_function():
"""A docstring."""
return decorators._synchronized_lock.acquire(False)
@synchronized(semaphore)
def custom_synchronized_function():
"""A docstring."""
return semaphore.acquire(False)
try:
from signal import SIGALRM, SIGFPE, SIGIO
@sighandler(SIGALRM)
def signal_handler(signum, frame):
"""A docstring."""
global results
results = 1
@sighandler((SIGFPE, SIGIO))
def signals_handler(signum, frame):
pass
except ImportError:
pass
def thread_function(value):
time.sleep(value)
return value
def queue_function(queues, index, value):
time.sleep(value)
queues[index].put(value)
return value
def spurious_wakeup_function(value, lock):
value = value / 2
time.sleep(value)
lock.acquire()
time.sleep(value)
return value
class TestSynchronizedDecorator(unittest.TestCase):
def test_wrapper_decorator_docstring(self):
"""Synchronized docstring of the original function is preserved."""
self.assertEqual(synchronized_function.__doc__, "A docstring.")
def test_syncronized_locked(self):
"""Synchronized Lock is acquired
during execution of decorated function."""
self.assertFalse(synchronized_function())
def test_syncronized_released(self):
"""Synchronized Lock is released
during execution of decorated function."""
synchronized_function()
self.assertTrue(decorators._synchronized_lock.acquire(False))
decorators._synchronized_lock.release()
def test_custom_syncronized_locked(self):
"""Synchronized semaphore is acquired
during execution of decorated function."""
self.assertFalse(custom_synchronized_function())
def test_custom_syncronized_released(self):
"""Synchronized semaphore is acquired
during execution of decorated function."""
custom_synchronized_function()
self.assertTrue(semaphore.acquire(False))
semaphore.release()
class TestSigHandler(unittest.TestCase):
def test_wrapper_decorator_docstring(self):
"""Sighandler docstring of the original function is preserved."""
if os.name != 'nt':
self.assertEqual(signal_handler.__doc__, "A docstring.")
def test_sighandler(self):
"""Sighandler installs SIGALRM."""
if os.name != 'nt':
self.assertEqual(signal.getsignal(signal.SIGALRM).__name__,
signal_handler.__name__)
def test_sighandler_multiple(self):
"""Sighandler installs SIGFPE and SIGIO."""
if os.name != 'nt':
self.assertEqual(signal.getsignal(signal.SIGFPE).__name__,
signals_handler.__name__)
self.assertEqual(signal.getsignal(signal.SIGIO).__name__,
signals_handler.__name__)
def test_sigalarm_sighandler(self):
"""Sighandler for SIGALARM works."""
if os.name != 'nt':
os.kill(os.getpid(), signal.SIGALRM)
time.sleep(0.1)
self.assertEqual(results, 1)
class TestWaitForThreads(unittest.TestCase):
def test_waitforthreads_single(self):
"""Waitforthreads waits for a single thread."""
thread = launch_thread(None, thread_function, True, 0.01)
self.assertEqual(list(waitforthreads([thread]))[0], thread)
def test_waitforthreads_multiple(self):
"""Waitforthreads waits for multiple threads."""
threads = []
for _ in range(5):
threads.append(launch_thread(None, thread_function, True, 0.01))
time.sleep(0.1)
self.assertEqual(list(waitforthreads(threads)), threads)
def test_waitforthreads_timeout(self):
"""Waitforthreads returns empty list if timeout."""
thread = launch_thread(None, thread_function, True, 0.1)
self.assertEqual(list(waitforthreads([thread], timeout=0.01)), [])
def test_waitforthreads_restore(self):
"""Waitforthreads get_ident is restored to original one."""
if hasattr(threading, 'get_ident'):
expected = threading.get_ident
else:
expected = threading._get_ident
thread = launch_thread(None, thread_function, True, 0)
time.sleep(0.01)
waitforthreads([thread])
if hasattr(threading, 'get_ident'):
self.assertEqual(threading.get_ident, expected)
else:
self.assertEqual(threading._get_ident, expected)
def test_waitforthreads_spurious(self):
"""Waitforthreads tolerates spurious wakeups."""
lock = threading.RLock()
thread = launch_thread(None, spurious_wakeup_function, True, 0.1, lock)
self.assertEqual(list(waitforthreads([thread])), [thread])
class TestWaitForQueues(unittest.TestCase):
def setUp(self):
self.queues = [Queue(), Queue(), Queue()]
def test_waitforqueues_single(self):
"""Waitforqueues waits for a single queue."""
launch_thread(None, queue_function, True, self.queues, 0, 0.01)
self.assertEqual(list(waitforqueues(self.queues))[0], self.queues[0])
def test_waitforqueues_multiple(self):
"""Waitforqueues waits for multiple queues."""
for index in range(3):
launch_thread(None, queue_function, True, self.queues, index, 0.01)
time.sleep(0.1)
self.assertEqual(list(waitforqueues(self.queues)), self.queues)
def test_waitforqueues_timeout(self):
"""Waitforqueues returns empty list if timeout."""
launch_thread(None, queue_function, True, self.queues, 0, 0.1)
self.assertEqual(list(waitforqueues(self.queues, timeout=0.01)), [])
def test_waitforqueues_restore(self):
"""Waitforqueues Queue object is restored to original one."""
expected = sorted(dir(self.queues[0]))
launch_thread(None, queue_function, True, self.queues, 0, 0)
waitforqueues(self.queues)
self.assertEqual(sorted(dir(self.queues[0])), expected)
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