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# ========================================================================== #
# #
# KVMD - The main Pi-KVM daemon. #
# #
# Copyright (C) 2018 Maxim Devaev <[email protected]> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
# ========================================================================== #
import os
import multiprocessing
import multiprocessing.queues
import multiprocessing.sharedctypes
import queue
from typing import Dict
from . import aiotools
# =====
class AioProcessNotifier:
def __init__(self) -> None:
self.__queue: multiprocessing.queues.Queue = multiprocessing.Queue()
self.__pid = os.getpid()
def notify(self) -> None:
assert os.getpid() != self.__pid, "Child only"
self.__queue.put(None)
async def wait(self) -> None:
assert os.getpid() == self.__pid, "Parent only"
while not (await aiotools.run_async(self.__inner_wait)):
pass
def __inner_wait(self) -> bool:
try:
self.__queue.get(timeout=0.1)
while not self.__queue.empty():
self.__queue.get()
return True
except queue.Empty:
return False
# =====
class AioSharedFlags:
def __init__(
self,
initial: Dict[str, bool],
notifier: AioProcessNotifier,
) -> None:
self.__local_flags = dict(initial) # To fast comparsion
self.__notifier = notifier
self.__shared_flags: Dict[str, multiprocessing.sharedctypes.RawValue] = {
key: multiprocessing.RawValue("i", int(value)) # type: ignore
for (key, value) in initial.items()
}
self.__lock = multiprocessing.Lock()
self.__pid = os.getpid()
def update(self, **kwargs: bool) -> None:
assert os.getpid() != self.__pid, "Child only"
changed = False
try:
for (key, value) in kwargs.items():
value = bool(value)
if self.__local_flags[key] != value:
if not changed:
self.__lock.acquire()
self.__shared_flags[key].value = int(value)
self.__local_flags[key] = value
changed = True
finally:
if changed:
self.__lock.release()
self.__notifier.notify()
async def get(self) -> Dict[str, bool]:
return (await aiotools.run_async(self.__inner_get))
def __inner_get(self) -> Dict[str, bool]:
assert os.getpid() == self.__pid, "Parent only"
with self.__lock:
return {
key: bool(shared.value)
for (key, shared) in self.__shared_flags.items()
}
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