Mercurial > hg > mercurial-crew-with-dirclash
view mercurial/lock.py @ 192:5d8553352d2e
Changes to network protocol
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Changes to network protocol
Stream changes at the delta level rather than at whole delta groups
this breaks the protocol - we now send a zero byte delta to indicate
the end of a group rather than sending the entire group length up front
Fix filename length asymmetry while we're breaking things
Fix hidden O(n^2) bug in calculating changegroup
list.append(e) is O(n), list + [element] is not
Decompress chunks on read in revlog.group()
Improve status messages
report bytes transferred
report nothing to do
Deal with /dev/null path brokenness
Remove untriggered patch assertion
manifest hash: 3eedcfe878561f9eb4adedb04f6be618fb8ae8d8
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author | mpm@selenic.com |
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date | Mon, 30 May 2005 08:03:54 -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)