def client_fork(t: Thread, b: bool, cell: Cell) -> None:
Requires(Acc(MayStart(t)))
Requires(getMethod(t) == Cell.incr)
Requires(Acc(cell.val))
Requires(cell is getArg(t, 0))
Ensures(getOld(t, arg(0).val) == 12)
Ensures(WaitLevel() < Level(t))
#:: ExpectedOutput(postcondition.violated:insufficient.permission)
Ensures(Acc(MayStart(t)))
cell.val = 12
t.start(decr, Cell.incr)
def client_fork(t: Thread, l: BaseLock) -> None:
Requires(Acc(MayStart(t)))
Requires(getMethod(t) == noop)
Requires(l is getArg(t, 0))
Ensures(WaitLevel() < Level(t))
#:: ExpectedOutput(invalid.program:invalid.thread.start)
t.start(noop)
def client_fork_wrong_mayjoin(t: Thread, b: bool, cell: Cell) -> None:
Requires(Acc(MayStart(t)))
Requires(getMethod(t) == Cell.incr)
Requires(Acc(cell.val))
Requires(cell is getArg(t, 0))
#:: ExpectedOutput(postcondition.violated:assertion.false)
Ensures(Joinable(t))
t.start(decr, Cell.incr)
def client_fork_wrong_thread_post(t: Thread, b: bool, cell: Cell) -> None:
Requires(Acc(MayStart(t)))
Requires(getMethod(t) == Cell.incr)
Requires(Acc(cell.val))
Requires(cell is getArg(t, 0))
#:: ExpectedOutput(postcondition.violated:insufficient.permission)
Ensures(Acc(ThreadPost(t)))
t.start(decr, Cell.incr)
def client_fork_wrong_old_2(t: Thread, b: bool, cell: Cell) -> None:
Requires(Acc(MayStart(t)))
Requires(getMethod(t) == Cell.incr)
Requires(Acc(cell.val))
Requires(cell is getArg(t, 0))
#:: ExpectedOutput(postcondition.violated:assertion.false)
Ensures(getOld(t, arg(0).val) == 14)
cell.val = 12
t.start(decr, Cell.incr)
def client_create(b: bool) -> Thread:
Ensures(MayStart(Result()))
Ensures(Implies(b, getArg(Result(), 1) is 3))
Ensures(Implies(not b, getArg(Result(), 1) is 6))
Ensures(Implies(not b, getMethod(Result()) == decr))
#:: ExpectedOutput(postcondition.violated:assertion.false)
Ensures(getArg(Result(), 2) is None)
cl = Cell()
if b:
t = Thread(None, target=cl.incr, args=(3, ))
else:
t = Thread(target=decr, group=None, args=(cl, 6))
return t
def client_fork_precond_not_fulfilled(t: Thread, b: bool, cell: Cell) -> None:
Requires(Acc(MayStart(t)))
Requires(getMethod(t) == Cell.incr)
Requires(cell is getArg(t, 0))
#:: ExpectedOutput(thread.start.failed:insufficient.permission)
t.start(decr, Cell.incr)
def client_fork_method_unknown(t: Thread, b: bool, cell: Cell) -> None:
Requires(Acc(MayStart(t)))
Requires(Acc(cell.val))
Requires(cell is getArg(t, 0))
#:: ExpectedOutput(thread.start.failed:method.not.listed)
t.start(decr, Cell.incr)