*** empty log message ***

lib/Components/ExtensionClass/Sync.py

+#!/bin/env python
+#
+#     Copyright 
+#
+#       Copyright 1996 Digital Creations, L.C., 910 Princess Anne
+#       Street, Suite 300, Fredericksburg, Virginia 22401 U.S.A. All
+#       rights reserved.  Copyright in this software is owned by DCLC,
+#       unless otherwise indicated. Permission to use, copy and
+#       distribute this software is hereby granted, provided that the
+#       above copyright notice appear in all copies and that both that
+#       copyright notice and this permission notice appear. Note that
+#       any product, process or technology described in this software
+#       may be the subject of other Intellectual Property rights
+#       reserved by Digital Creations, L.C. and are not licensed
+#       hereunder.
+#
+#     Trademarks 
+#
+#       Digital Creations & DCLC, are trademarks of Digital Creations, L.C..
+#       All other trademarks are owned by their respective companies. 
+#
+#     No Warranty 
+#
+#       The software is provided "as is" without warranty of any kind,
+#       either express or implied, including, but not limited to, the
+#       implied warranties of merchantability, fitness for a particular
+#       purpose, or non-infringement. This software could include
+#       technical inaccuracies or typographical errors. Changes are
+#       periodically made to the software; these changes will be
+#       incorporated in new editions of the software. DCLC may make
+#       improvements and/or changes in this software at any time
+#       without notice.
+#
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+#
+#       In no event will DCLC be liable for direct, indirect, special,
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+#  
+#
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+#
+#   Digital Creations, L.C.
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+# 
+__doc__='''Synchronized Classes
+
+Module to support classes that "synchronize" method calls, meaning
+that only one thread can be in an instance\'s method at one time.
+
+Note that no protection is provided for attribute access. At least,
+not at this time
+
+$Id: Sync.py,v 1.1 1997/04/11 21:50:29 jim Exp $'''
+
+__version__='$Revision: 1.1 $'[11:-2]
+
+import ThreadLock
+from ExtensionClass import Base
+
+class Synchronized(Base):
+    
+    def __call_method__(self,f,a,k={}):
+	try: lock=self._sync__lock
+	except AttributeError: lock=self._sync__lock=ThreadLock.allocate_lock()
+	try:
+	    lock.acquire()
+	    return apply(f,a,k)
+	finally:
+	    lock.release()
+
+