add a releasefn keyword to lock.lock

add a releasefn keyword to lock.lock

releasefn is a function that will be executed when the lock is released

--- a/mercurial/lock.py	Fri Nov 11 15:34:06 2005 -0800
+++ b/mercurial/lock.py	Fri Nov 11 15:34:09 2005 -0800
@@ -12,10 +12,11 @@
     pass
 
 class lock:
-    def __init__(self, file, wait=1):
+    def __init__(self, file, wait=1, releasefn=None):
         self.f = file
         self.held = 0
         self.wait = wait
+        self.releasefn = releasefn
         self.lock()
 
     def __del__(self):
@@ -43,6 +44,8 @@
     def release(self):
         if self.held:
             self.held = 0
+            if self.releasefn:
+                self.releasefn()
             try:
                 os.unlink(self.f)
             except: pass