Mercurial > public > mercurial-scm > hg
annotate mercurial/lock.py @ 1530:abfab59fce79
add a releasefn keyword to lock.lock
releasefn is a function that will be executed when the lock is released
| author | Benoit Boissinot <benoit.boissinot@ens-lyon.org> |
|---|---|
| date | Fri, 11 Nov 2005 15:34:09 -0800 |
| parents | 6d5a62a549fa |
| children | 59b3639df0a9 |
| rev | line source |
|---|---|
| 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 | |
| 8 import os, time | |
|
422
10c43444a38e
[PATCH] Enables lock work under the other 'OS'
mpm@selenic.com
parents:
161
diff
changeset
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9 import util |
| 161 | 10 |
| 11 class LockHeld(Exception): | |
| 12 pass | |
| 13 | |
| 14 class lock: | |
|
1530
abfab59fce79
add a releasefn keyword to lock.lock
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1062
diff
changeset
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15 def __init__(self, file, wait=1, releasefn=None): |
| 161 | 16 self.f = file |
| 17 self.held = 0 | |
| 18 self.wait = wait | |
|
1530
abfab59fce79
add a releasefn keyword to lock.lock
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1062
diff
changeset
|
19 self.releasefn = releasefn |
| 161 | 20 self.lock() |
| 21 | |
| 22 def __del__(self): | |
| 23 self.release() | |
| 24 | |
| 25 def lock(self): | |
| 26 while 1: | |
| 27 try: | |
| 28 self.trylock() | |
| 29 return 1 | |
| 30 except LockHeld, inst: | |
| 31 if self.wait: | |
| 32 time.sleep(1) | |
| 33 continue | |
| 34 raise inst | |
| 515 | 35 |
| 161 | 36 def trylock(self): |
| 37 pid = os.getpid() | |
| 38 try: | |
|
422
10c43444a38e
[PATCH] Enables lock work under the other 'OS'
mpm@selenic.com
parents:
161
diff
changeset
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39 util.makelock(str(pid), self.f) |
| 161 | 40 self.held = 1 |
|
704
5ca319a641e1
Make makelock and readlock work on filesystems without symlink support.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
515
diff
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41 except (OSError, IOError): |
|
422
10c43444a38e
[PATCH] Enables lock work under the other 'OS'
mpm@selenic.com
parents:
161
diff
changeset
|
42 raise LockHeld(util.readlock(self.f)) |
| 161 | 43 |
| 44 def release(self): | |
| 45 if self.held: | |
| 46 self.held = 0 | |
|
1530
abfab59fce79
add a releasefn keyword to lock.lock
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1062
diff
changeset
|
47 if self.releasefn: |
|
abfab59fce79
add a releasefn keyword to lock.lock
Benoit Boissinot <benoit.boissinot@ens-lyon.org>
parents:
1062
diff
changeset
|
48 self.releasefn() |
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503
c6a2e41c8c60
Fix troubles with clone and exception handling
mpm@selenic.com
parents:
429
diff
changeset
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49 try: |
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c6a2e41c8c60
Fix troubles with clone and exception handling
mpm@selenic.com
parents:
429
diff
changeset
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50 os.unlink(self.f) |
|
c6a2e41c8c60
Fix troubles with clone and exception handling
mpm@selenic.com
parents:
429
diff
changeset
|
51 except: pass |
| 161 | 52 |