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# SPDX-FileCopyrightText: All Contributors to the PyTango project
# SPDX-License-Identifier: LGPL-3.0-or-later
from tango import (
Util,
SerialModel,
AutoTangoAllowThreads,
EnsureOmniThread,
AutoTangoMonitor,
DevFailed,
)
from tango.server import Device, attribute
from tango.test_utils import DeviceTestContext
from threading import Thread, Event
from queue import Queue
import pytest
from time import sleep
pytestmark = pytest.mark.extra_src_test
def do_nothing():
sleep(1e-3)
class SimpleDS(Device):
def init_device(self):
u = Util.instance()
mode = SerialModel.BY_CLASS
u.set_serial_model(mode)
assert u.get_serial_model() == mode
with AutoTangoAllowThreads(self):
with AutoTangoAllowThreads(self):
do_nothing()
@attribute
def attr(self) -> int:
return 1234
def test_dont_crash_with_nested_tango_allow_threads():
with DeviceTestContext(SimpleDS) as proxy:
assert proxy.attr == 1234
class MonSameThread(Device):
serial_model = None
unlock = None
running = None
def init_device(self):
u = Util.instance()
u.set_serial_model(MonSameThread.serial_model)
assert u.get_serial_model() == MonSameThread.serial_model
self._thread = Thread(target=self.thread_func)
MonSameThread.running = True
self._thread.start()
def delete_device(self):
MonSameThread.running = False
self._thread.join()
def thread_func(self):
with EnsureOmniThread():
if MonDiffThread.serial_model == SerialModel.BY_CLASS:
obj = self.get_device_class()
else:
obj = self
with AutoTangoMonitor(obj):
if MonSameThread.unlock:
# unlock it again
with AutoTangoAllowThreads(self):
while MonSameThread.running:
do_nothing()
else:
while MonSameThread.running:
do_nothing()
@attribute
def attr(self) -> int:
return 1234
@pytest.mark.parametrize("unlock", [True, False])
def test_monitor_force_unlock_from_same_thread(
unlock, server_green_mode, server_serial_model
):
MonSameThread.serial_model = server_serial_model
MonSameThread.unlock = unlock
if unlock:
if server_serial_model == SerialModel.BY_CLASS:
pytest.xfail(
"Not implemented, see https://gitlab.com/tango-controls/pytango/-/issues/650"
)
elif server_serial_model == SerialModel.BY_PROCESS:
pytest.xfail(
"Not implemented, see https://gitlab.com/tango-controls/pytango/-/issues/650"
)
with DeviceTestContext(MonSameThread) as proxy:
if server_serial_model == SerialModel.NO_SYNC:
assert proxy.attr == 1234
elif unlock:
assert proxy.attr == 1234
else:
with pytest.raises(
DevFailed, match="not able to acquire serialization monitor"
):
assert proxy.attr == 1234
# required especially by SerialModel.BY_PROCESS so that the DS can be killed from the test context
MonSameThread.running = False
class MonDiffThread(Device):
serial_model = None
unlock = None
running = None
def init_device(self):
u = Util.instance()
u.set_serial_model(MonDiffThread.serial_model)
assert u.get_serial_model() == MonDiffThread.serial_model
MonDiffThread.running = True
self._lock_thread = Thread(target=self.lock_thread_func)
self._lock_thread.start()
self._unlock_thread = Thread(target=self.unlock_thread_func)
self._unlock_thread.start()
def delete_device(self):
MonDiffThread.running = False
self._lock_thread.join()
self._unlock_thread.join()
def lock_thread_func(self):
with EnsureOmniThread():
if MonDiffThread.serial_model == SerialModel.BY_CLASS:
obj = self.get_device_class()
else:
obj = self
with AutoTangoMonitor(obj):
while MonDiffThread.running:
do_nothing()
def unlock_thread_func(self):
with EnsureOmniThread():
if MonDiffThread.unlock:
# try to unlock it, but as this is from a different thread, nothing happens
with AutoTangoAllowThreads(self):
while MonDiffThread.running:
do_nothing()
else:
while MonDiffThread.running:
do_nothing()
@attribute
def attr(self) -> int:
return 1234
@pytest.mark.parametrize("unlock", [True, False])
def test_monitor_force_unlock_from_different_thread(
unlock, server_green_mode, server_serial_model
):
MonDiffThread.serial_model = server_serial_model
MonDiffThread.unlock = unlock
with DeviceTestContext(MonDiffThread) as proxy:
if server_serial_model == SerialModel.NO_SYNC:
assert proxy.attr == 1234
else:
with pytest.raises(
DevFailed, match="not able to acquire serialization monitor"
):
assert proxy.attr == 1234
# required especially by SerialModel.BY_PROCESS so that the DS can be killed from the test context
MonDiffThread.running = False
class DontDeadlock(Device):
def init_device(self) -> None:
self.queue = Queue[Event | None]()
self.thread = Thread(target=self._run)
self.thread.start()
def delete_device(self) -> None:
self.queue.put(None)
self.thread.join()
def _run(self) -> None:
with EnsureOmniThread():
while True:
ev = self.queue.get()
if ev is None:
break
with AutoTangoMonitor(self):
ev.set()
@attribute
def attr(self) -> int:
ev = Event()
self.queue.put(ev)
# Allow the thread to run and start waiting for the monitor
sleep(0.01)
with AutoTangoAllowThreads(self):
ev.wait()
return 1234
# This test will probably only fail if the system is under load
def test_dont_deadlock_when_releasing_monitor():
with DeviceTestContext(DontDeadlock, process=True) as proxy:
for _ in range(100):
assert proxy.attr == 1234
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