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#
# Copyright © 2012 Intel Corporation
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice (including the next
# paragraph) shall be included in all copies or substantial portions of the
# Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
#
import sys
import threading
import time
from threading import Thread, Timer
from multiprocessing import cpu_count
from collections import deque
import subprocess
__all__ = ['processQueue']
class Worker(Thread):
def __init__(self, queue, handleItem):
Thread.__init__(self)
self.queue = queue
self.handle = handleItem
self.seqno = 0
self.start()
def run(self):
while True:
self.seqno += 1
try:
item = self.queue.pop()
except IndexError:
break
self.handle(item)
def processQueue(items, process, num_threads=0):
"""
Concurrently processes the given queue of items using a thread pool.
The main thread will block until all threads are complete or until
SIGINT/KeyboardInterrupt is received. If interrupted, the main thread
will empty the queue and wait for any outstanding tasks to complete
before continuing. It does not rethrow KeyboardInterrupt.
items -- the queue to process. Will be turned into a deque.
process -- callback for items. void function taking one argument.
num_threads -- number of worker threads to create. If 0 or None,
use the current number of CPUs.
"""
if not num_threads:
num_threads = cpu_count()
queue = deque(items)
workers = [Worker(queue, process) for i in range(num_threads)]
try:
for w in workers:
w.join()
except KeyboardInterrupt:
print("Interrupted. Discarding remaining tasks.")
queue.clear()
print("Waiting for threads to quiesce...")
while threading.activeCount() > 1:
pass
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