--- a/mercurial/lock.py	Mon Jan 12 10:59:08 2009 -0600
+++ b/mercurial/lock.py	Mon Jan 12 11:09:14 2009 -0600
@@ -5,20 +5,7 @@
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
-import errno, os, socket, time, util
-
-class LockException(IOError):
-    def __init__(self, errno, strerror, filename, desc):
-        IOError.__init__(self, errno, strerror, filename)
-        self.desc = desc
-
-class LockHeld(LockException):
-    def __init__(self, errno, filename, desc, locker):
-        LockException.__init__(self, errno, 'Lock held', filename, desc)
-        self.locker = locker
-
-class LockUnavailable(LockException):
-    pass
+import errno, os, socket, time, util, error
 
 class lock(object):
     # lock is symlink on platforms that support it, file on others.
@@ -48,14 +35,14 @@
             try:
                 self.trylock()
                 return 1
-            except LockHeld, inst:
+            except error.LockHeld, inst:
                 if timeout != 0:
                     time.sleep(1)
                     if timeout > 0:
                         timeout -= 1
                     continue
-                raise LockHeld(errno.ETIMEDOUT, inst.filename, self.desc,
-                               inst.locker)
+                raise error.LockHeld(errno.ETIMEDOUT, inst.filename, self.desc,
+                                     inst.locker)
 
     def trylock(self):
         if lock._host is None:
@@ -69,11 +56,11 @@
                 if why.errno == errno.EEXIST:
                     locker = self.testlock()
                     if locker is not None:
-                        raise LockHeld(errno.EAGAIN, self.f, self.desc,
-                                       locker)
+                        raise error.LockHeld(errno.EAGAIN, self.f, self.desc,
+                                             locker)
                 else:
-                    raise LockUnavailable(why.errno, why.strerror,
-                                          why.filename, self.desc)
+                    raise error.LockUnavailable(why.errno, why.strerror,
+                                                why.filename, self.desc)
 
     def testlock(self):
         """return id of locker if lock is valid, else None.
@@ -106,7 +93,7 @@
             l.trylock()
             os.unlink(self.f)
             l.release()
-        except (LockHeld, LockUnavailable):
+        except error.LockError:
             return locker
 
     def release(self):