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comparison mercurial/lock.py @ 1753:e6e70450edb9

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Raise a different exception when the lock is not available When the filesystem is read-only or if we have some other error, there is no need to wait. Raise a lock.LockUnavailable exception.
author Benoit Boissinot <benoit.boissinot@ens-lyon.org>
date Mon, 20 Feb 2006 01:09:40 +0100
parents 59b3639df0a9
children e431344e604c
comparison
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1752:457cdec745f8 1753:e6e70450edb9
3 # Copyright 2005 Matt Mackall <mpm@selenic.com> 3 # Copyright 2005 Matt Mackall <mpm@selenic.com>
4 # 4 #
5 # This software may be used and distributed according to the terms 5 # This software may be used and distributed according to the terms
6 # of the GNU General Public License, incorporated herein by reference. 6 # of the GNU General Public License, incorporated herein by reference.
7 7
8 import os, time 8 import errno, os, time
9 import util 9 import util
10 10
11 class LockHeld(Exception): 11 class LockException(Exception):
12 pass
13 class LockHeld(LockException):
14 pass
15 class LockUnavailable(LockException):
12 pass 16 pass
13 17
14 class lock(object): 18 class lock(object):
15 def __init__(self, file, wait=1, releasefn=None): 19 def __init__(self, file, wait=1, releasefn=None):
16 self.f = file 20 self.f = file
36 def trylock(self): 40 def trylock(self):
37 pid = os.getpid() 41 pid = os.getpid()
38 try: 42 try:
39 util.makelock(str(pid), self.f) 43 util.makelock(str(pid), self.f)
40 self.held = 1 44 self.held = 1
41 except (OSError, IOError): 45 except (OSError, IOError), why:
42 raise LockHeld(util.readlock(self.f)) 46 if why.errno == errno.EEXIST:
47 raise LockHeld(util.readlock(self.f))
48 else:
49 raise LockUnavailable(why)
43 50
44 def release(self): 51 def release(self):
45 if self.held: 52 if self.held:
46 self.held = 0 53 self.held = 0
47 if self.releasefn: 54 if self.releasefn: