Michele Simionato wrote:
This is just to ask if somebody here has experience with session management
in mod_python and if we could borrow ideas/code from it (for instance about
the locking mechanism). I have heard people saying sessions in mod_python
work fine, so I wanted to know if this was a general impression. This is
the relevant page in the documentation:
http://www.modpython.org/live/current/doc-html/pyapi-sess.html
Michele Simionato
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I haven't used mod_python, but here's the locking code. It seems to be
a wrapper around an Apache locking feature. It all looks very
Apache-specific, possibly useful for mod_scgi but not much elsewhere.
# --- mod_python/Session module --
class BaseSession(dict):
def __init__(self, ..., lock=1, ...):
self._lock = lock
self._locked = 0
...
self.init_lock()
if self._sid: # Session ID.
self.lock()
...
if self._new:
# Unlock old ._sid, create session, unlock new ._sid.
def __del__(self):
self.unlock()
def init_lock(self):
pass
def lock(self):
if self._lock: # Using DBM sessions rather than memory sessions.
_apache._global_lock(self._req.server, self._sid)
self._locked = 1
...
# --- _apachemodule.c ---
.._global_lock is a C method that calls:
apr_pool_userdata_get
apr_global_mutex_lock
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