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"""
TestCases for testing the locking sub-system.
"""
import sys
import time
import unittest
from test_all import db, test_support, verbose, have_threads, \
get_new_environment_path, get_new_database_path
if have_threads :
from threading import Thread
if sys.version_info[0] < 3 :
from threading import currentThread
else :
from threading import current_thread as currentThread
#----------------------------------------------------------------------
class LockingTestCase(unittest.TestCase):
def setUp(self):
self.homeDir = get_new_environment_path()
self.env = db.DBEnv()
self.env.open(self.homeDir, db.DB_THREAD | db.DB_INIT_MPOOL |
db.DB_INIT_LOCK | db.DB_CREATE)
def tearDown(self):
self.env.close()
test_support.rmtree(self.homeDir)
def test01_simple(self):
if verbose:
print '\n', '-=' * 30
print "Running %s.test01_simple..." % self.__class__.__name__
anID = self.env.lock_id()
if verbose:
print "locker ID: %s" % anID
lock = self.env.lock_get(anID, "some locked thing", db.DB_LOCK_WRITE)
if verbose:
print "Acquired lock: %s" % lock
self.env.lock_put(lock)
if verbose:
print "Released lock: %s" % lock
self.env.lock_id_free(anID)
def test02_threaded(self):
if verbose:
print '\n', '-=' * 30
print "Running %s.test02_threaded..." % self.__class__.__name__
threads = []
threads.append(Thread(target = self.theThread,
args=(db.DB_LOCK_WRITE,)))
threads.append(Thread(target = self.theThread,
args=(db.DB_LOCK_READ,)))
threads.append(Thread(target = self.theThread,
args=(db.DB_LOCK_READ,)))
threads.append(Thread(target = self.theThread,
args=(db.DB_LOCK_WRITE,)))
threads.append(Thread(target = self.theThread,
args=(db.DB_LOCK_READ,)))
threads.append(Thread(target = self.theThread,
args=(db.DB_LOCK_READ,)))
threads.append(Thread(target = self.theThread,
args=(db.DB_LOCK_WRITE,)))
threads.append(Thread(target = self.theThread,
args=(db.DB_LOCK_WRITE,)))
threads.append(Thread(target = self.theThread,
args=(db.DB_LOCK_WRITE,)))
for t in threads:
import sys
if sys.version_info[0] < 3 :
t.setDaemon(True)
else :
t.daemon = True
t.start()
for t in threads:
t.join()
def test03_lock_timeout(self):
self.env.set_timeout(0, db.DB_SET_LOCK_TIMEOUT)
self.assertEqual(self.env.get_timeout(db.DB_SET_LOCK_TIMEOUT), 0)
self.env.set_timeout(0, db.DB_SET_TXN_TIMEOUT)
self.assertEqual(self.env.get_timeout(db.DB_SET_TXN_TIMEOUT), 0)
self.env.set_timeout(123456, db.DB_SET_LOCK_TIMEOUT)
self.assertEqual(self.env.get_timeout(db.DB_SET_LOCK_TIMEOUT), 123456)
self.env.set_timeout(7890123, db.DB_SET_TXN_TIMEOUT)
self.assertEqual(self.env.get_timeout(db.DB_SET_TXN_TIMEOUT), 7890123)
def test04_lock_timeout2(self):
self.env.set_timeout(0, db.DB_SET_LOCK_TIMEOUT)
self.env.set_timeout(0, db.DB_SET_TXN_TIMEOUT)
self.env.set_timeout(123456, db.DB_SET_LOCK_TIMEOUT)
self.env.set_timeout(7890123, db.DB_SET_TXN_TIMEOUT)
def deadlock_detection() :
while not deadlock_detection.end :
deadlock_detection.count = \
self.env.lock_detect(db.DB_LOCK_EXPIRE)
if deadlock_detection.count :
while not deadlock_detection.end :
pass
break
time.sleep(0.01)
deadlock_detection.end=False
deadlock_detection.count=0
t=Thread(target=deadlock_detection)
import sys
if sys.version_info[0] < 3 :
t.setDaemon(True)
else :
t.daemon = True
t.start()
self.env.set_timeout(100000, db.DB_SET_LOCK_TIMEOUT)
anID = self.env.lock_id()
anID2 = self.env.lock_id()
self.assertNotEqual(anID, anID2)
lock = self.env.lock_get(anID, "shared lock", db.DB_LOCK_WRITE)
start_time=time.time()
self.assertRaises(db.DBLockNotGrantedError,
self.env.lock_get,anID2, "shared lock", db.DB_LOCK_READ)
end_time=time.time()
deadlock_detection.end=True
# Floating point rounding
if sys.platform == 'win32':
# bpo-30850: On Windows, tolerate 50 ms whereas 100 ms is expected.
# The lock sometimes times out after only 58 ms. Windows clocks
# have a bad resolution and bad accuracy.
min_dt = 0.050
else:
min_dt = 0.0999
self.assertGreaterEqual(end_time-start_time, min_dt)
self.env.lock_put(lock)
t.join()
self.env.lock_id_free(anID)
self.env.lock_id_free(anID2)
if db.version() >= (4,6):
self.assertGreater(deadlock_detection.count, 0)
def theThread(self, lockType):
import sys
if sys.version_info[0] < 3 :
name = currentThread().getName()
else :
name = currentThread().name
if lockType == db.DB_LOCK_WRITE:
lt = "write"
else:
lt = "read"
anID = self.env.lock_id()
if verbose:
print "%s: locker ID: %s" % (name, anID)
for i in xrange(1000) :
lock = self.env.lock_get(anID, "some locked thing", lockType)
if verbose:
print "%s: Acquired %s lock: %s" % (name, lt, lock)
self.env.lock_put(lock)
if verbose:
print "%s: Released %s lock: %s" % (name, lt, lock)
self.env.lock_id_free(anID)
#----------------------------------------------------------------------
def test_suite():
suite = unittest.TestSuite()
if have_threads:
suite.addTest(unittest.makeSuite(LockingTestCase))
else:
suite.addTest(unittest.makeSuite(LockingTestCase, 'test01'))
return suite
if __name__ == '__main__':
unittest.main(defaultTest='test_suite')
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