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"""
TestCases for testing the locking sub-system.
"""
import time
try:
from threading import Thread, currentThread
have_threads = 1
except ImportError:
have_threads = 0
import unittest
from test_all import verbose, get_new_environment_path, get_new_database_path
try:
# For Pythons w/distutils pybsddb
from bsddb3 import db
except ImportError:
# For Python 2.3
from bsddb import db
try:
from bsddb3 import test_support
except ImportError:
from test import test_support
#----------------------------------------------------------------------
class LockingTestCase(unittest.TestCase):
import sys
if sys.version_info[:3] < (2, 4, 0):
def assertTrue(self, expr, msg=None):
self.failUnless(expr,msg=msg)
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 "Aquired lock: %s" % lock
self.env.lock_put(lock)
if verbose:
print "Released lock: %s" % lock
if db.version() >= (4,0):
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:
t.setDaemon(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.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)
t.setDaemon(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
self.assertTrue((end_time-start_time) >= 0.1)
self.env.lock_put(lock)
t.join()
if db.version() >= (4,0):
self.env.lock_id_free(anID)
self.env.lock_id_free(anID2)
if db.version() >= (4,6):
self.assertTrue(deadlock_detection.count>0)
def theThread(self, lockType):
name = currentThread().getName()
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: Aquired %s lock: %s" % (name, lt, lock)
self.env.lock_put(lock)
if verbose:
print "%s: Released %s lock: %s" % (name, lt, lock)
if db.version() >= (4,0):
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')
|
