Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/lock.py @ 267:497aa6d276d2
Initial import of hgit and hgk
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Initial import of hgit and hgk
Support for git compatibility sufficient to run gitk on top of hg
repositories. This includes:
hgit diff-tree
hgit rev-list
hgit rev-tree
hgit cat-file
Signed-off-by: Chris Mason <mason@suse.com>
hgk is a slightly modified version of gitk1.1 from Paul Mackerras. It has
been changed to use hgit commands, and has support for the extended
rev-list -c to speed up the commit listing.
Signed-off-by: Chris Mason <mason@suse.com>
manifest hash: 5a4a27135bc85bab2a3a1e35018a08a985d8d146
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| author | mpm@selenic.com |
|---|---|
| date | Tue, 07 Jun 2005 00:00:56 -0800 |
| parents | 0b4c5cb953d9 |
| children | 10c43444a38e 688d03d6997a |
| rev | line source |
|---|---|
| 161 | 1 # lock.py - simple locking scheme for mercurial |
| 2 # | |
| 3 # Copyright 2005 Matt Mackall <mpm@selenic.com> | |
| 4 # | |
| 5 # This software may be used and distributed according to the terms | |
| 6 # of the GNU General Public License, incorporated herein by reference. | |
| 7 | |
| 8 import os, time | |
| 9 | |
| 10 class LockHeld(Exception): | |
| 11 pass | |
| 12 | |
| 13 class lock: | |
| 14 def __init__(self, file, wait = 1): | |
| 15 self.f = file | |
| 16 self.held = 0 | |
| 17 self.wait = wait | |
| 18 self.lock() | |
| 19 | |
| 20 def __del__(self): | |
| 21 self.release() | |
| 22 | |
| 23 def lock(self): | |
| 24 while 1: | |
| 25 try: | |
| 26 self.trylock() | |
| 27 return 1 | |
| 28 except LockHeld, inst: | |
| 29 if self.wait: | |
| 30 time.sleep(1) | |
| 31 continue | |
| 32 raise inst | |
| 33 | |
| 34 def trylock(self): | |
| 35 pid = os.getpid() | |
| 36 try: | |
| 37 os.symlink(str(pid), self.f) | |
| 38 self.held = 1 | |
| 39 except: | |
| 40 raise LockHeld(os.readlink(self.f)) | |
| 41 | |
| 42 def release(self): | |
| 43 if self.held: | |
| 44 self.held = 0 | |
| 45 os.unlink(self.f) | |
| 46 |