Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/lock.py @ 1862:b41d71961aed
Moved bisect extension to hgext folder.
author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Wed, 08 Mar 2006 19:30:30 +0100 |
parents | cd5c1db2132a |
children | d314a89fa4f1 |
rev | line source |
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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 | |
1836
cd5c1db2132a
make lock module use demandload.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
1787
diff
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8 from demandload import * |
cd5c1db2132a
make lock module use demandload.
Vadim Gelfer <vadim.gelfer@gmail.com>
parents:
1787
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9 demandload(globals(), 'errno os time util') |
161 | 10 |
1753
e6e70450edb9
Raise a different exception when the lock is not available
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1559
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11 class LockException(Exception): |
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1559
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changeset
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12 pass |
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Raise a different exception when the lock is not available
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1559
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changeset
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13 class LockHeld(LockException): |
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1559
diff
changeset
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14 pass |
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
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15 class LockUnavailable(LockException): |
161 | 16 pass |
17 | |
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Convert all classes to new-style classes by deriving them from object.
Eric Hopper <hopper@omnifarious.org>
parents:
1530
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18 class lock(object): |
1787
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add a timeout when a lock is held (default 1024 sec)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
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19 def __init__(self, file, timeout=-1, releasefn=None): |
161 | 20 self.f = file |
21 self.held = 0 | |
1787
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add a timeout when a lock is held (default 1024 sec)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1753
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changeset
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22 self.timeout = timeout |
1530
abfab59fce79
add a releasefn keyword to lock.lock
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1062
diff
changeset
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23 self.releasefn = releasefn |
161 | 24 self.lock() |
25 | |
26 def __del__(self): | |
27 self.release() | |
28 | |
29 def lock(self): | |
1787
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add a timeout when a lock is held (default 1024 sec)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1753
diff
changeset
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30 timeout = self.timeout |
161 | 31 while 1: |
32 try: | |
33 self.trylock() | |
34 return 1 | |
35 except LockHeld, inst: | |
1787
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add a timeout when a lock is held (default 1024 sec)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1753
diff
changeset
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36 if timeout != 0: |
161 | 37 time.sleep(1) |
1787
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add a timeout when a lock is held (default 1024 sec)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1753
diff
changeset
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38 if timeout > 0: |
e431344e604c
add a timeout when a lock is held (default 1024 sec)
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1753
diff
changeset
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39 timeout -= 1 |
161 | 40 continue |
41 raise inst | |
515 | 42 |
161 | 43 def trylock(self): |
44 pid = os.getpid() | |
45 try: | |
422
10c43444a38e
[PATCH] Enables lock work under the other 'OS'
mpm@selenic.com
parents:
161
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46 util.makelock(str(pid), self.f) |
161 | 47 self.held = 1 |
1753
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1559
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48 except (OSError, IOError), why: |
e6e70450edb9
Raise a different exception when the lock is not available
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
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49 if why.errno == errno.EEXIST: |
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Raise a different exception when the lock is not available
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
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diff
changeset
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50 raise LockHeld(util.readlock(self.f)) |
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Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1559
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51 else: |
e6e70450edb9
Raise a different exception when the lock is not available
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1559
diff
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52 raise LockUnavailable(why) |
161 | 53 |
54 def release(self): | |
55 if self.held: | |
56 self.held = 0 | |
1530
abfab59fce79
add a releasefn keyword to lock.lock
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1062
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57 if self.releasefn: |
abfab59fce79
add a releasefn keyword to lock.lock
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1062
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58 self.releasefn() |
503
c6a2e41c8c60
Fix troubles with clone and exception handling
mpm@selenic.com
parents:
429
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59 try: |
c6a2e41c8c60
Fix troubles with clone and exception handling
mpm@selenic.com
parents:
429
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60 os.unlink(self.f) |
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Fix troubles with clone and exception handling
mpm@selenic.com
parents:
429
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61 except: pass |
161 | 62 |