/usr/share/pyshared/pyarco/Thread.py is in atheist 0.20110402-2.
This file is owned by root:root, with mode 0o644.
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"""threads module provides useful structures for concurrent and
threading programming tools.
.. moduleauthor:: Arco Research Group
"""
from __future__ import with_statement
import threading
import logging
import time
import Queue
class ThreadFunc(threading.Thread):
"""If it is needed to execute the function on another thread and stop is
requiered. Otherwise, use thread.start_new_thread
"""
def __init__(self, function, args=(), kargs={}, start=True):
threading.Thread.__init__(self, name=function.__name__)
self.function = function
self.args = args
self.kargs = kargs
self.active = threading.Event()
self.active.set()
if start:
self.start()
def cancel(self):
self.active.clear()
def run(self):
self.function(*self.args, **self.kargs)
class ThreadTimeout(threading.Thread):
""" Run a function each interval seconds. Function must return
'True' to continue executing. Based on threding.Timer class """
def __init__(self, interval, function, args=[], at_init=False):
threading.Thread.__init__(self, name=function.__name__)
self.interval = interval # secs
self.function = function
self.args = args
self.at_init = at_init
self.finished = threading.Event()
self.play = threading.Event()
self.start()
def __del__(self):
self.cancel()
def cancel(self):
"terminates the thread"
self.play.set()
self.finished.set()
def pause(self):
self.play.clear()
def play(self):
self.play.set()
def run(self):
if self.at_init:
if not self.function(*self.args): return
while 1:
self.finished.wait(self.interval)
if self.finished.isSet(): break
if not self.function(*self.args): break
class EventPool(threading.Thread):
'''Event pool based exclusively upon threads.'''
class Task:
def __init__(self, ctx, interval, func, args=[]):
self.ctx = ctx
self.interval = interval
self.function = func
self.args = args
self.diff = interval
def __repr__(self):
return "%s.%s i:%s, d:%s" % (self.ctx.name, self.function.__name__,
self.interval, self.diff)
class Context:
def __init__(self, poll, persistent, name=''):
self.pool = poll
self.persistent = persistent
self.name = name
self.tasks = []
self.reset = self.add
def add_func(self, interval, func, *args):
retval = EventPool.Task(self, interval, func, args)
self.add(retval)
return retval
def new_task(self, interval, function, *args):
return EventPool.Task(self, interval, function, args)
def add(self, task):
if task not in self.tasks: self.tasks.append(task)
self.pool.add_task(task)
return task
def cancel(self, task=None):
if isinstance(task, EventPool.Task):
try:
self.tasks.remove(task)
except ValueError:
return
self.pool.cancel_task_now(task)
return
if task == None:
task = self.tasks[:]
if isinstance(task, list):
for t in task:
self.cancel(t)
def __repr__(self):
return repr(self.tasks)
def __init__(self, persistent=True, name=None):
threading.Thread.__init__(self, name=name)
self.persistent = persistent
self.name = name
self.lock = threading.RLock()
self.finished = threading.Event()
self.__contexts = []
self.__tasks = []
self.__added = []
def new_context(self, persistent=True, name=''):
# deny if thread is running
ctx = EventPool.Context(self, persistent, name)
self.__contexts.append(ctx)
return ctx
def add_task(self, task):
self.__added.append(task)
def cancel_task_now(self, task):
self.lock.acquire()
if task in self.__added:
self.__added.remove(task)
else:
self.__cancel_task(task)
self.lock.release()
def close(self):
self.finished.set()
def __add_task(self, new_task):
total = 0
for i,t in enumerate(self.__tasks):
if total + t.diff > new_task.interval:
new_task.diff = new_task.interval - total
t.diff -= new_task.diff
self.__tasks.insert(i, new_task)
return
total += t.diff
new_task.diff = new_task.interval - total
self.__tasks.append(new_task)
def __cancel_task(self, task):
if task not in self.__tasks:
return
i = self.__tasks.index(task)
if len(self.__tasks) > i+1:
self.__tasks[i+1].diff += task.diff
self.__tasks.remove(task)
def __pending(self):
for t in self.__added:
if t in self.__tasks:
self.__cancel_task(t)
self.__add_task(t)
self.__added = []
# clear empty __contexts
for c in self.__contexts:
if not c.persistent and not c.tasks:
self.__contexts.remove(c)
if not self.persistent and not self.__contexts:
self.finished.set()
def run(self):
while not self.finished.isSet():
self.lock.acquire()
self.__pending()
while self.__tasks and self.__tasks[0].diff <= 0:
task = self.__tasks[0]
self.__tasks.remove(task)
result = task.function(*task.args)
if result:
self.__add_task(task)
else:
try:
task.ctx.tasks.remove(task)
except ValueError:
pass
if self.__tasks:
self.__tasks[0].diff -= 1
self.lock.release()
time.sleep(1)
# from http://code.activestate.com/recipes/203871/
class ThreadPool:
class JoiningEx: pass
""" Flexible thread pool class. Creates a pool of threads, then
accepts tasks that will be dispatched to the next available
thread """
def __init__(self, numThreads):
"""Initialize the thread pool with numThreads workers """
self.__threads = []
self.__resizeLock = threading.Lock()
self.__taskLock = threading.Condition(threading.Lock())
self.__tasks = []
self.__isJoining = False
self.resize(numThreads)
def resize(self, newsize):
""" public method to set the current pool size """
if self.__isJoining:
raise ThreadPool.JoiningEx()
with self.__resizeLock:
self.__resize(newsize)
return True
def __resize(self, newsize):
"""Set the current pool size, spawning or terminating threads
if necessary. Internal use only; assumes the resizing lock is
held."""
diff = newsize - len(self.__threads)
# If we need to grow the pool, do so
for i in range(diff):
self.__threads.append(ThreadPool.Worker(self))
# If we need to shrink the pool, do so
for i in range(-diff):
thread = self.__threads.pop()
thread.stop = True
def __len__(self):
"""Return the number of threads in the pool."""
with self.__resizeLock:
return len(self.__threads)
def add(self, task, args=None, callback=None):
"""Insert a task into the queue. task must be callable;
args and taskCallback can be None."""
assert callable(task)
if self.__isJoining:
raise ThreadPool.JoiningEx()
with self.__taskLock:
self.__tasks.append((task, args, callback))
self.__taskLock.notify()
return True
def nextTask(self):
""" Retrieve the next task from the task queue. For use
only by ThreadPoolWorker objects contained in the pool """
with self.__taskLock:
while not self.__tasks:
if self.__isJoining:
raise ThreadPool.JoiningEx()
self.__taskLock.wait()
assert self.__tasks
return self.__tasks.pop(0)
def join(self, waitForTasks=True, waitForThreads=True):
""" Clear the task queue and terminate all pooled threads,
optionally allowing the tasks and threads to finish """
self.__isJoining = True # prevent more task queueing
if waitForTasks:
while self.__tasks:
time.sleep(0.1)
with self.__resizeLock:
if waitForThreads:
with self.__taskLock:
self.__taskLock.notifyAll()
for t in self.__threads:
t.join()
# ready to reuse
del self.__threads[:]
self.__isJoining = False
class Worker(threading.Thread):
""" Pooled thread class """
def __init__(self, pool):
""" Initialize the thread and remember the pool. """
threading.Thread.__init__(self)
self.__pool = pool
self.stop = False
self.start()
def run(self):
""" Until told to quit, retrieve the next task and execute
it, calling the callback if any. """
while not self.stop:
try:
cmd, args, callback = self.__pool.nextTask()
except ThreadPool.JoiningEx:
break
logging.debug("thread %s taken %s" % (self, cmd))
result = cmd(*args)
if callback:
callback(result)
class SimpleThreadPool:
def __init__(self, numThreads):
self.tasks = Queue.Queue()
self.threads = [SimpleThreadPool.Worker(self.tasks) for x in range(numThreads)]
def add(self, func, args=None, callback=None):
assert callable(func)
self.tasks.put((func, args, callback))
def map(self, func, values):
holders = [SimpleThreadPool.Holder() for x in range(len(values))]
for value, callback in zip(values, holders):
self.add(func, (value,), callback)
self.join()
return [x.value for x in holders]
def join(self):
self.tasks.join()
class Worker(threading.Thread):
def __init__(self, tasks):
threading.Thread.__init__(self)
self.tasks = tasks
self.daemon = True
self.start()
def run(self):
while 1:
func, args, callback = self.tasks.get()
logging.debug("thread %s taken %s", self, func)
result = func(*args)
self.tasks.task_done()
if callback:
callback(result)
class Holder:
def __init__(self):
self.value = None
def __call__(self, arg):
self.value = arg
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