/usr/lib/python3/dist-packages/oslo_service/threadgroup.py is in python3-oslo.service 1.29.0-0ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 | # Copyright 2012 Red Hat, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import logging
import threading
import eventlet
from eventlet import greenpool
from oslo_service import loopingcall
from oslo_utils import timeutils
LOG = logging.getLogger(__name__)
def _on_thread_done(_greenthread, group, thread):
"""Callback function to be passed to GreenThread.link() when we spawn().
Calls the :class:`ThreadGroup` to notify it to remove this thread from
the associated group.
"""
group.thread_done(thread)
class Thread(object):
"""Wrapper around a greenthread.
Holds a reference to the :class:`ThreadGroup`. The Thread will notify
the :class:`ThreadGroup` when it has done so it can be removed from
the threads list.
"""
def __init__(self, thread, group, link=True):
self.thread = thread
if link:
self.thread.link(_on_thread_done, group, self)
self._ident = id(thread)
@property
def ident(self):
return self._ident
def stop(self):
self.thread.kill()
def wait(self):
return self.thread.wait()
def link(self, func, *args, **kwargs):
self.thread.link(func, *args, **kwargs)
def cancel(self, *throw_args):
self.thread.cancel(*throw_args)
class ThreadGroup(object):
"""The point of the ThreadGroup class is to:
* keep track of timers and greenthreads (making it easier to stop them
when need be).
* provide an easy API to add timers.
"""
def __init__(self, thread_pool_size=10):
self.pool = greenpool.GreenPool(thread_pool_size)
self.threads = []
self.timers = []
def add_dynamic_timer(self, callback, initial_delay=None,
periodic_interval_max=None, *args, **kwargs):
timer = loopingcall.DynamicLoopingCall(callback, *args, **kwargs)
timer.start(initial_delay=initial_delay,
periodic_interval_max=periodic_interval_max)
self.timers.append(timer)
return timer
def add_timer(self, interval, callback, initial_delay=None,
*args, **kwargs):
pulse = loopingcall.FixedIntervalLoopingCall(callback, *args, **kwargs)
pulse.start(interval=interval,
initial_delay=initial_delay)
self.timers.append(pulse)
return pulse
def add_thread(self, callback, *args, **kwargs):
gt = self.pool.spawn(callback, *args, **kwargs)
th = Thread(gt, self, link=False)
self.threads.append(th)
gt.link(_on_thread_done, self, th)
return th
def thread_done(self, thread):
self.threads.remove(thread)
def timer_done(self, timer):
self.timers.remove(timer)
def _perform_action_on_threads(self, action_func, on_error_func):
current = threading.current_thread()
# Iterate over a copy of self.threads so thread_done doesn't
# modify the list while we're iterating
for x in self.threads[:]:
if x.ident == current.ident:
# Don't perform actions on the current thread.
continue
try:
action_func(x)
except eventlet.greenlet.GreenletExit: # nosec
# greenlet exited successfully
pass
except Exception:
on_error_func(x)
def _stop_threads(self):
self._perform_action_on_threads(
lambda x: x.stop(),
lambda x: LOG.exception('Error stopping thread.'))
def stop_timers(self):
for timer in self.timers:
timer.stop()
self.timers = []
def stop(self, graceful=False):
"""stop function has the option of graceful=True/False.
* In case of graceful=True, wait for all threads to be finished.
Never kill threads.
* In case of graceful=False, kill threads immediately.
"""
self.stop_timers()
if graceful:
# In case of graceful=True, wait for all threads to be
# finished, never kill threads
self.wait()
else:
# In case of graceful=False(Default), kill threads
# immediately
self._stop_threads()
def wait(self):
for x in self.timers:
try:
x.wait()
except eventlet.greenlet.GreenletExit: # nosec
# greenlet exited successfully
pass
except Exception:
LOG.exception('Error waiting on timer.')
self._perform_action_on_threads(
lambda x: x.wait(),
lambda x: LOG.exception('Error waiting on thread.'))
def _any_threads_alive(self):
current = threading.current_thread()
for x in self.threads[:]:
if x.ident == current.ident:
# Don't check current thread.
continue
if not x.thread.dead:
return True
return False
def cancel(self, *throw_args, **kwargs):
self._perform_action_on_threads(
lambda x: x.cancel(*throw_args),
lambda x: LOG.exception('Error canceling thread.'))
timeout = kwargs.get('timeout', None)
if timeout is None:
return
wait_time = kwargs.get('wait_time', 1)
watch = timeutils.StopWatch(duration=timeout)
watch.start()
while self._any_threads_alive():
if not watch.expired():
eventlet.sleep(wait_time)
continue
LOG.debug("Cancel timeout reached, stopping threads.")
self.stop()
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