Code for locking a resource

tarun tarundevnani at gmail.com
Tue Aug 19 13:50:40 CEST 2008


Hello All,

I've a configuration.ini file. This particular can be accessed by several
threads of my application. Each thread can read/write configuration
parameters from/to the configuration.ini file. I am using threading (Rlock)
to lock the resource (configuration.ini file) while accessing it from any
thread. I use the file available at
http://www.voidspace.org.uk/python/configobj.html for read/write.
(configobj.py)

I've used RLock to lock the resource.

I see this error while accessing variables of the configuration.ini file

Exception in thread Thread-3:
Traceback (most recent call last):
  File "C:\Python25\lib\threading.py", line 460, in __bootstrap
    self.run()
  File "F:\abc.py", line 229, in run
    option1 = conf['OPT1']
  File "F:\configobj.py", line 551, in __getitem__
    val = dict.__getitem__(self, key)
KeyError: 'OPT1'

Exception in thread Thread-1:
Traceback (most recent call last):
  File "C:\Python25\lib\threading.py", line 460, in __bootstrap
    self.run()
  File "F:\def.py", line 130, in run
    option2 = self.conf['OPT2']
  File "F:\configobj.py", line 551, in __getitem__
    val = dict.__getitem__(self, key)
KeyError: 'OPT2'

Can any one help me with a code for locking a resource across threads.

One more observation. I tried the following code on Python Idle

>>> import threading
>>> threading.RLock()
<_RLock(None, 0)>
>>> threading.Lock()
<thread.lock object at 0x019350B0>

Why does threading.RLock() return None

Thanks In Advance,
Tarun
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