Mercurial > hg > mercurial-crew-with-dirclash
view mercurial/lock.py @ 512:78896f572a22
Remove unnecessary deletion in hg clone
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Remove unnecessary deletion in hg clone
manifest hash: 4a750332a8b1fe07b63f77ccede89d6486a478e9
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author | mpm@selenic.com |
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date | Tue, 28 Jun 2005 10:43:20 -0800 |
parents | c6a2e41c8c60 |
children | 03f27b1381f9 |
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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 import util 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: util.makelock(str(pid), self.f) self.held = 1 except: raise LockHeld(util.readlock(self.f)) def release(self): if self.held: self.held = 0 try: os.unlink(self.f) except: pass