def t2():
t1launched.wait()
# This thread does the committing after t1 started but before it reads the value of refA
self.d("** Creating ref")
self.refA = Ref(5, None)
self.refA.refSet(6)
def testBarge(self):
# Barging happens when one transaction tries to do an in-transaction-write to a ref that has
# an in-transaction-value from another transaction
t1wait = Event()
t2wait = Event()
self.t1counter = 0
self.t2counter = 0
def t1():
# We do the first in-transaction-write
self.refA.refSet(888)
# Don't commit yet, we want t2 to run and barge us
self.d("* Notify")
t2wait.set()
self.d("* Wait")
t1wait.wait()
self.d("* Done")
self.t1counter += 1
def t2():
# Wait till t1 has done its write
self.d("** Wait")
t2wait.wait()
# Try to write to the ref
# We should try and succeed to barge them: we were started first
# and should be long-lived enough
self.d("** Before barge")
self.refA.refSet(777)
self.d("** After barge")
sleep(.1)
t1wait.set()
self.t2counter += 1
self.refA = Ref(999, None)
th1 = self.runTransactionInThread(t1, autostart=False)
th2 = self.runTransactionInThread(t2, autostart=False)
# Start thread 1 first, give the GIL a cycle so it waits for t2wait
th2.start()
sleep(.1)
th1.start()
# Wait for the test to finish
self.join_all()
# T2 should have successfully barged T1, so T1 should have been re-run
# The final value of the ref should be 888, as T1 ran last
self.assertEqual(self.t1counter, 2)
self.assertEqual(self.t2counter, 1)
self.assertEqual(self.refA.deref(), 888)
self.d("Final value of ref: %s and t1 ran %s times" % (self.refA.deref(), self.t1counter))
def testCommutes(self):
# Make sure multiple transactions that occur simultaneously each commute the same ref
# Hard to check for this behaving properly---it should have fewer retries than if each
# transaction did an alter, but if transactions commit at the same time one might have to retry
# anyway. The difference is usually an order of magnitude, so this test is pretty safe
self.numruns = AtomicInteger()
self.numalterruns = AtomicInteger()
numthreads = 20
def incr(curval):
return curval + 1
def adder(curval, extraval):
return curval + extraval
def t1():
self.numruns.getAndIncrement()
self.refA.commute(incr, [])
def t2():
# self.d("Thread %s (%s): ALTER BEING RUN, total retry num: %s" % (current_thread().ident, id(current_thread()), self.numalterruns.getAndIncrement()))
self.numalterruns.getAndIncrement()
self.refB.alter(adder, [100])
self.refA = Ref(0, None)
self.refB = Ref(0, None)
for i in range(numthreads):
self.runTransactionInThread(t1)
self.join_all()
for i in range(numthreads):
self.runTransactionInThread(t2)
self.join_all()
self.d("Commute took %s runs and counter is %s" % (self.numruns.get(), self.refA.deref()))
self.d("Alter took %s runs and counter is %s" % (self.numalterruns.get(), self.refB.deref()))
self.assertEqual(self.refA.deref(), numthreads)
self.assertEqual(self.refB.deref(), 2000)
self.assertTrue(self.numalterruns.get() >= self.numruns.get())
def testSimpleConcurrency(self):
def t1():
sleep(.1)
self.ref0.refSet(1)
def t2():
self.ref0.refSet(2)
# Delaying t1 means it should commit after t2
self.ref0 = Ref(0, None)
self.runTransactionInThread(t1)
self.runTransactionInThread(t2)
self.join_all()
self.assertEqual(self.ref0.deref(), 1)
def testRun_PASS(self):
# Now we'll run a transaction ourselves
self.refOne = Ref(111, None)
self.refTwo = Ref(222, None)
# Our transaction body will do a ref-set and an alter (increment a ref by 1)
def body():
# Body of the transaction!
self.refZero.refSet(999)
def incr(val):
return val + 1
self.refOne.alter(incr, [])
# Test our transaction actually made the changes it should have
LockingTransaction.runInTransaction(body)
self.assertEqual(self.refZero.deref(), 999)
self.assertEqual(self.refOne.deref(), 112)
self.assertEqual(self.refTwo.deref(), 222)
# Test that the transaction ended properly
self.assertRaises(IllegalStateException, self.refZero.refSet, 999)
def setUp(self):
self.refZero = Ref(0, None)
self.refOne = Ref(pv.vec(range(10)), None)
def setUp(self):
self.refZero = Ref(0, None)
