Mercurial > public > mercurial-scm > hg
annotate mercurial/lock.py @ 422:10c43444a38e
[PATCH] Enables lock work under the other 'OS'
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[PATCH] Enables lock work under the other 'OS'
From: K Thananchayan <thananck@yahoo.com>
os.symlink is not supported under Windows. This patch
introduces util.mklockf, util.getlowner that use
regular files under Winodws but symlink under unix.
tweaked by mpm:
- changed function names
- fixed to work on UNIX
manifest hash: 6f650a78a3b203dcad2f861582500b6b4036599a
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| author | mpm@selenic.com |
|---|---|
| date | Tue, 21 Jun 2005 19:43:40 -0800 |
| parents | 0b4c5cb953d9 |
| children | 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 | |
|
422
10c43444a38e
[PATCH] Enables lock work under the other 'OS'
mpm@selenic.com
parents:
161
diff
changeset
|
9 import util |
| 161 | 10 |
| 11 class LockHeld(Exception): | |
| 12 pass | |
| 13 | |
| 14 class lock: | |
| 15 def __init__(self, file, wait = 1): | |
| 16 self.f = file | |
| 17 self.held = 0 | |
| 18 self.wait = wait | |
| 19 self.lock() | |
| 20 | |
| 21 def __del__(self): | |
| 22 self.release() | |
| 23 | |
| 24 def lock(self): | |
| 25 while 1: | |
| 26 try: | |
| 27 self.trylock() | |
| 28 return 1 | |
| 29 except LockHeld, inst: | |
| 30 if self.wait: | |
| 31 time.sleep(1) | |
| 32 continue | |
| 33 raise inst | |
| 34 | |
| 35 def trylock(self): | |
| 36 pid = os.getpid() | |
| 37 try: | |
|
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10c43444a38e
[PATCH] Enables lock work under the other 'OS'
mpm@selenic.com
parents:
161
diff
changeset
|
38 util.makelock(str(pid), self.f) |
| 161 | 39 self.held = 1 |
| 40 except: | |
|
422
10c43444a38e
[PATCH] Enables lock work under the other 'OS'
mpm@selenic.com
parents:
161
diff
changeset
|
41 raise LockHeld(util.readlock(self.f)) |
| 161 | 42 |
| 43 def release(self): | |
| 44 if self.held: | |
| 45 self.held = 0 | |
| 46 os.unlink(self.f) | |
| 47 |