pull this in as it's necessary for my slinke stuff.. I have a

change to make to it..

[git-p4: depot-paths = "//depot/": change = 1375]

filelock.py

@@ -0,0 +1,29 @@
+import fcntl
+import shelve
+
+class FileLock(object):
+	def __init__(self, fname = None):
+		self.f = open(fname, 'w+')
+		self.islocked = False
+
+	def exclusivelock(self):
+		fcntl.flock(self.f.fileno(), fcntl.LOCK_EX)
+		self.islocked = True
+
+	def sharedlock(self):
+		fcntl.flock(self.f.fileno(), fcntl.LOCK_SH)
+		self.islocked = True
+
+	def unlock(self):
+		fcntl.flock(self.f.fileno(), fcntl.LOCK_UN)
+		self.islocked = False
+
+class LockShelve(FileLock, shelve.DbfilenameShelf):
+	def __init__(self, fname, *args, **kwargs):
+		FileLock.__init__(self, fname + ".lock")
+		self.exclusivelock()
+		try:
+			shelve.DbfilenameShelf.__init__(self, fname, *args, **kwargs)
+		except:
+			self.f.close()
+			raise