Mercurial > hg > mercurial-crew-with-dirclash

annotate mercurial/lock.py @ 1875:2f4a0734c100

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Catch other exceptions (e.g. util.Abort) in parse(), too. This has the benefit of removing duplicate catching of AmbiguousCommand and UnknownCommand, and keeping all exception handling together.
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 10 Mar 2006 11:33:28 +0100
parents cd5c1db2132a
children d314a89fa4f1
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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 from demandload import *
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9 demandload(globals(), 'errno os time util')
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10
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11 class LockException(Exception):
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12 pass
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13 class LockHeld(LockException):
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14 pass
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15 class LockUnavailable(LockException):
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16 pass
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17
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18 class lock(object):
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19 def __init__(self, file, timeout=-1, releasefn=None):
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20 self.f = file
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21 self.held = 0
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22 self.timeout = timeout
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23 self.releasefn = releasefn
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24 self.lock()
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25
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26 def __del__(self):
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27 self.release()
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29 def lock(self):
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30 timeout = self.timeout
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31 while 1:
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32 try:
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33 self.trylock()
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34 return 1
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35 except LockHeld, inst:
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36 if timeout != 0:
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37 time.sleep(1)
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38 if timeout > 0:
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39 timeout -= 1
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40 continue
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41 raise inst
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42
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43 def trylock(self):
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44 pid = os.getpid()
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45 try:
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46 util.makelock(str(pid), self.f)
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47 self.held = 1
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48 except (OSError, IOError), why:
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49 if why.errno == errno.EEXIST:
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50 raise LockHeld(util.readlock(self.f))
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51 else:
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52 raise LockUnavailable(why)
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53
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54 def release(self):
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55 if self.held:
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56 self.held = 0
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57 if self.releasefn:
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58 self.releasefn()
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59 try:
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60 os.unlink(self.f)
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61 except: pass
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