Mercurial > hg > mercurial-crew-with-dirclash
view mercurial/lock.py @ 339:a76fc9c4b67b
added hg identify|id (based on a patch from Andrew Thompson)
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author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Wed, 15 Jun 2005 06:44:43 +0100 |
parents | 0b4c5cb953d9 |
children | 10c43444a38e 688d03d6997a |
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# 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)