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73 lines
2.5 KiB
Python
73 lines
2.5 KiB
Python
# Copyright (C) 2005-2014 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 along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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"""
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Locking utility class.
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"""
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import threading
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from . import log, LOG_THREAD
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def get_lock(name, debug=False):
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"""Get a new lock.
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@param debug: if True, acquire() and release() will have debug messages
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@ptype debug: boolean, default is False
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@return: a lock object
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@rtype: threading.Lock or DebugLock
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"""
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lock = threading.Lock()
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# for thread debugging, use the DebugLock wrapper
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if debug:
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lock = DebugLock(lock, name)
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return lock
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class DebugLock:
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"""Debugging lock class."""
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def __init__(self, lock, name):
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"""Store lock and name parameters."""
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self.lock = lock
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self.name = name
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def acquire(self, blocking=1):
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"""Acquire lock."""
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threadname = threading.currentThread().getName()
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log.debug(LOG_THREAD, "Acquire %s for %s", self.name, threadname)
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self.lock.acquire(blocking)
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log.debug(LOG_THREAD, "...acquired %s for %s", self.name, threadname)
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def release(self):
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"""Release lock."""
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threadname = threading.currentThread().getName()
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log.debug(LOG_THREAD, "Release %s for %s", self.name, threadname)
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self.lock.release()
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def get_semaphore(name, value=None, debug=False):
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"""Get a new semaphore.
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@param value: if not None, a BoundedSemaphore will be used
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@ptype debug: int or None
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@param debug: if True, acquire() and release() will have debug messages
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@ptype debug: boolean, default is False
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@return: a semaphore object
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@rtype: threading.Semaphore or threading.BoundedSemaphore or DebugLock
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"""
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if value is None:
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lock = threading.Semaphore()
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else:
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lock = threading.BoundedSemaphore(value)
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if debug:
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lock = DebugLock(lock, name)
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return lock
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