Mercurial > hg > mercurial-crew-with-dirclash
view mercurial/lock.py @ 596:9a8daeff0ffa
A bunch of parsing/help updates
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A bunch of parsing/help updates
more explanation of how to get non-basic commands
shorten names of debug functions and add docstrings
add undo long docstring
promote anotate, export, and revert
make the global opts array global
refactor parsing
kill two unused arguments to fancyopts
update test-help
manifest hash: 459ae2273aaf54f71b4576677a681dc53ab2908c
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author | mpm@selenic.com |
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date | Sun, 03 Jul 2005 11:47:45 -0800 |
parents | 03f27b1381f9 |
children | 5ca319a641e1 574869103985 |
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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