Mercurial > hg > pyhgsh

annotate mercurial/lock.py @ 515:03f27b1381f9

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author mpm@selenic.com
date Wed, 29 Jun 2005 10:42:35 -0800
parents c6a2e41c8c60
children 5ca319a641e1 574869103985
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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:
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15 def __init__(self, file, wait = 1):
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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.lock()
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20
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21 def __del__(self):
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22 self.release()
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23
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24 def lock(self):
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25 while 1:
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26 try:
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27 self.trylock()
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28 return 1
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29 except LockHeld, inst:
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30 if self.wait:
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31 time.sleep(1)
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32 continue
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33 raise inst
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34
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35 def trylock(self):
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36 pid = os.getpid()
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37 try:
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38 util.makelock(str(pid), self.f)
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39 self.held = 1
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40 except:
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41 raise LockHeld(util.readlock(self.f))
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42
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43 def release(self):
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44 if self.held:
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45 self.held = 0
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46 try:
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47 os.unlink(self.f)
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48 except: pass
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