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d834aa0f2d
git-svn-id: https://linkchecker.svn.sourceforge.net/svnroot/linkchecker/trunk/linkchecker@2310 e7d03fd6-7b0d-0410-9947-9c21f3af8025
98 lines
2.8 KiB
Python
98 lines
2.8 KiB
Python
# -*- coding: iso-8859-1 -*-
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# Copyright (C) 2000-2005 Bastian Kleineidam
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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"""
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Threading support.
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"""
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import time
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try:
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import threading
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except ImportError:
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import dummy_threading as threading
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class Threader (object):
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"""
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A thread generating class. Note that since Python has no ability to
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stop threads from outside, one has to make sure threads poll
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regularly for outside variables to stop them. Or one makes sure
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threads surely will terminate in finite time.
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"""
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def __init__ (self, num=5):
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"""
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Store maximum number of threads to generate, and initialize
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an empty thread list.
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"""
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# this allows negative numbers
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self.threads_max = max(num, 1)
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# list of active threads to watch
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self.threads = []
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def _acquire (self):
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"""
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Wait until we are allowed to start a new thread.
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"""
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while self.active_threads() >= self.threads_max:
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self._reduce_threads()
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time.sleep(0.1)
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def _reduce_threads (self):
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"""
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Remove inactive threads.
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"""
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self.threads = [ t for t in self.threads if t.isAlive() ]
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def active_threads (self):
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"""
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Return number of active threads.
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"""
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return len(self.threads)
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def finished (self):
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"""
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Return True if no active threads are left.
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"""
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if self.threads_max > 0:
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self._reduce_threads()
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return self.active_threads() == 0
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def finish (self):
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"""
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Remove inactive threads.
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"""
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self._reduce_threads()
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def start_thread (self, func, args):
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"""
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Generate a new thread.
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"""
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if self.threads_max < 1:
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# threading is disabled
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func(*args)
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else:
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self._acquire()
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t = threading.Thread(None, func, None, args)
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t.start()
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self.threads.append(t)
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def __str__ (self):
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"""
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String representation of threader state.
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"""
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return "Threader with %d threads (max %d)" % \
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(self.active_threads(), self.threads_max)
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