#
# NEPI, a framework to manage network experiments
# Copyright (C) 2013 INRIA
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation;
#
# 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 .
#
# Author: Claudio Freire
# Alina Quereilhac
#
import threading
import Queue
import traceback
import sys
import os
N_PROCS = None
class WorkerThread(threading.Thread):
class QUIT:
pass
def run(self):
while True:
task = self.queue.get()
if task is self.QUIT:
self.queue.task_done()
break
try:
try:
callable, args, kwargs = task
rv = callable(*args, **kwargs)
if self.rvqueue is not None:
self.rvqueue.put(rv)
finally:
self.queue.task_done()
except:
traceback.print_exc(file = sys.stderr)
self.delayed_exceptions.append(sys.exc_info())
def attach(self, queue, rvqueue, delayed_exceptions):
self.queue = queue
self.rvqueue = rvqueue
self.delayed_exceptions = delayed_exceptions
def quit(self):
self.queue.put(self.QUIT)
class ParallelRun(object):
def __init__(self, maxthreads = None, maxqueue = None, results = True):
self.maxqueue = maxqueue
self.maxthreads = maxthreads
self.queue = Queue.Queue(self.maxqueue or 0)
self.delayed_exceptions = []
if results:
self.rvqueue = Queue.Queue()
else:
self.rvqueue = None
self.initialize_workers()
def initialize_workers(self):
global N_PROCS
maxthreads = self.maxthreads
# Compute maximum number of threads allowed by the system
if maxthreads is None:
if N_PROCS is None:
try:
f = open("/proc/cpuinfo")
try:
N_PROCS = sum("processor" in l for l in f)
finally:
f.close()
except:
pass
maxthreads = N_PROCS
if maxthreads is None:
maxthreads = 4
self.workers = []
# initialize workers
for x in xrange(maxthreads):
worker = WorkerThread()
worker.attach(self.queue, self.rvqueue, self.delayed_exceptions)
worker.setDaemon(True)
self.workers.append(worker)
def __del__(self):
self.destroy()
def empty(self):
while True:
try:
self.queue.get(block = False)
self.queue.task_done()
except Queue.Empty:
break
def destroy(self):
self.join()
del self.workers[:]
def put(self, callable, *args, **kwargs):
self.queue.put((callable, args, kwargs))
def put_nowait(self, callable, *args, **kwargs):
self.queue.put_nowait((callable, args, kwargs))
def start(self):
for worker in self.workers:
if not worker.isAlive():
worker.start()
def join(self):
# Wait until all queued tasks have been processed
self.queue.join()
for worker in self.workers:
worker.quit()
for worker in self.workers:
worker.join()
def sync(self):
if self.delayed_exceptions:
typ,val,loc = self.delayed_exceptions[0]
del self.delayed_exceptions[:]
raise typ,val,loc
def __iter__(self):
if self.rvqueue is not None:
while True:
try:
yield self.rvqueue.get_nowait()
except Queue.Empty:
self.queue.join()
try:
yield self.rvqueue.get_nowait()
except Queue.Empty:
raise StopIteration