mercurial-crew-with-dirclash: mercurial/lock.py comparison

Simply repository locking This is a first pass at implementing repo locking. Next up, journal recovery and undo.

comparison

equal deleted inserted replaced

-:5c331d941c7f
+:0b4c5cb953d9
+# lock.py - simple locking scheme for mercurial
+#
+# Copyright 2005 Matt Mackall <mpm@selenic.com>
+#
+# This software may be used and distributed according to the terms
+# of the GNU General Public License, incorporated herein by reference.
+import os, time
+class LockHeld(Exception):
+pass
+class lock:
+def __init__(self, file, wait = 1):
+self.f = file
+self.held = 0
+self.wait = wait
+self.lock()
+def __del__(self):
+self.release()
+def lock(self):
+while 1:
+try:
+self.trylock()
+return 1
+except LockHeld, inst:
+if self.wait:
+time.sleep(1)
+continue
+raise inst
+def trylock(self):
+pid = os.getpid()
+try:
+os.symlink(str(pid), self.f)
+self.held = 1
+except:
+raise LockHeld(os.readlink(self.f))
+def release(self):
+if self.held:
+self.held = 0
+os.unlink(self.f)

Mercurial > hg > mercurial-crew-with-dirclash