Session ID & Security

[- c o v e n t r y -]

http://web.systhug.com/kernel-lock/ - for linux atomic file locking.

of course, wether your system is mulitprocess or multithreaded will vary
  the lock - a python multithreaded application can perform all locking
internally.  multiprocess requires external locking, such as the file
locking provided above in linux kernels and filesystems.  Note that
_how_  you store and lcok your data can play a big part in how the lock
affects performance.  a single, big lock on a single file containing all
session data will not scale.  I use individual files per session in my
projects, and lock individually - thus only simultaneous requests from
the same session can block each other - which is normally acceptable.

-c


Paul Rubin wrote:

> - c o v e n t r y - <coventry at removethisandallhyphens-o-n-e.net> writes:
> 
>>Why bother reinventing the wheel for a shared memory implementation
>>when you could just use the filesystem like everyone is used to, just
>>on a ram disk?
>>
>>Linux and the BSDs have the capability to do this...
>>
> 
> I'm not aware that Linux and BSD can do synchronous, atomic file
> operations.  I'm not terribly up on this stuff though.  What semaphore
> mechanism would you use?
> 
>