# -*- coding: utf-8 -*-
# Copyright (c) 2017-18 Richard Hull and contributors
# See LICENSE.rst for details.
# Adapted from http://code.activestate.com/recipes/577187-python-thread-pool/
# Attribution: Created by Emilio Monti on Sun, 11 Apr 2010 (MIT License).
from threading import Thread
[docs]
class worker(Thread):
"""
Thread executing tasks from a given tasks queue.
"""
def __init__(self, tasks):
Thread.__init__(self)
self.tasks = tasks
self.daemon = True
self.start()
[docs]
def run(self):
while True:
func, args, kargs = self.tasks.get()
func(*args, **kargs)
self.tasks.task_done()
[docs]
class threadpool:
"""
Pool of threads consuming tasks from a queue.
"""
def __init__(self, num_threads):
try:
from Queue import Queue
except ImportError:
from queue import Queue
self.tasks = Queue(num_threads)
for _ in range(num_threads):
worker(self.tasks)
[docs]
def add_task(self, func, *args, **kargs):
"""
Add a task to the queue.
"""
self.tasks.put((func, args, kargs))
[docs]
def wait_completion(self):
"""
Wait for completion of all the tasks in the queue.
"""
self.tasks.join()