Mercurial > hg > pyhgsh

annotate mercurial/lock.py @ 1559:59b3639df0a9

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Convert all classes to new-style classes by deriving them from object.
author Eric Hopper <hopper@omnifarious.org>
date Fri, 18 Nov 2005 22:48:47 -0800
parents abfab59fce79
children e6e70450edb9
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1 # lock.py - simple locking scheme for mercurial
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2 #
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3 # Copyright 2005 Matt Mackall <mpm@selenic.com>
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4 #
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5 # This software may be used and distributed according to the terms
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6 # of the GNU General Public License, incorporated herein by reference.
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7
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8 import os, time
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9 import util
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10
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11 class LockHeld(Exception):
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12 pass
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13
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14 class lock(object):
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15 def __init__(self, file, wait=1, releasefn=None):
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16 self.f = file
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17 self.held = 0
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18 self.wait = wait
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19 self.releasefn = releasefn
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20 self.lock()
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21
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22 def __del__(self):
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23 self.release()
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24
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25 def lock(self):
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26 while 1:
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27 try:
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28 self.trylock()
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29 return 1
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30 except LockHeld, inst:
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31 if self.wait:
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32 time.sleep(1)
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33 continue
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34 raise inst
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35
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36 def trylock(self):
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37 pid = os.getpid()
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38 try:
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39 util.makelock(str(pid), self.f)
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40 self.held = 1
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41 except (OSError, IOError):
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42 raise LockHeld(util.readlock(self.f))
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43
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44 def release(self):
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45 if self.held:
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46 self.held = 0
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47 if self.releasefn:
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48 self.releasefn()
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49 try:
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50 os.unlink(self.f)
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51 except: pass
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