Mercurial > hg > mercurial-crew-with-dirclash
view mercurial/lock.py @ 209:63af1db35611
Beginning of new command parsing interface
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Beginning of new command parsing interface
This adds commands.py, with a primary interface dispatch(args)
Dispatch searches a table of known commands, handles switches, sets up
a repo object if appropriate, and dispatches the command.
It also handles KeyboardInterrupt and can handle similar exceptions in
the future.
If the command is unknown, it falls through to the current command handler.
Commands currently handled by the new scheme: help, init, and annotate
manifest hash: 134cd032c880985e3f92f82efb8b629dd862ba4c
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author | mpm@selenic.com |
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date | Wed, 01 Jun 2005 00:25:42 -0800 |
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)