author | Edouard Gomez <ed.gomez@free.fr> |
Tue, 09 Aug 2005 09:36:34 -0800 | |
changeset 859 | 6390c377a9e6 |
parent 705 | 574869103985 |
child 1062 | 6d5a62a549fa |
permissions | -rw-r--r-- |
161 | 1 |
# lock.py - simple locking scheme for mercurial |
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# |
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# Copyright 2005 Matt Mackall <mpm@selenic.com> |
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# |
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# This software may be used and distributed according to the terms |
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# of the GNU General Public License, incorporated herein by reference. |
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import os, time |
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10c43444a38e
[PATCH] Enables lock work under the other 'OS'
mpm@selenic.com
parents:
161
diff
changeset
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import util |
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class LockHeld(Exception): |
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pass |
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class lock: |
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def __init__(self, file, wait = 1): |
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self.f = file |
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self.held = 0 |
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self.wait = wait |
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self.lock() |
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def __del__(self): |
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self.release() |
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def lock(self): |
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while 1: |
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try: |
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self.trylock() |
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return 1 |
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except LockHeld, inst: |
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if self.wait: |
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time.sleep(1) |
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continue |
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raise inst |
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def trylock(self): |
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pid = os.getpid() |
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try: |
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10c43444a38e
[PATCH] Enables lock work under the other 'OS'
mpm@selenic.com
parents:
161
diff
changeset
|
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util.makelock(str(pid), self.f) |
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self.held = 1 |
704
5ca319a641e1
Make makelock and readlock work on filesystems without symlink support.
Thomas Arendsen Hein <thomas@intevation.de>
parents:
515
diff
changeset
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except (OSError, IOError): |
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10c43444a38e
[PATCH] Enables lock work under the other 'OS'
mpm@selenic.com
parents:
161
diff
changeset
|
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raise LockHeld(util.readlock(self.f)) |
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def release(self): |
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if self.held: |
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self.held = 0 |
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503
c6a2e41c8c60
Fix troubles with clone and exception handling
mpm@selenic.com
parents:
429
diff
changeset
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try: |
c6a2e41c8c60
Fix troubles with clone and exception handling
mpm@selenic.com
parents:
429
diff
changeset
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os.unlink(self.f) |
c6a2e41c8c60
Fix troubles with clone and exception handling
mpm@selenic.com
parents:
429
diff
changeset
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except: pass |
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