Velocity Reviews - Computer Hardware Reviews

Velocity Reviews > Newsgroups > Programming > Python > RE: re-entrancy question

Thread Tools

RE: re-entrancy question

Tim Golden
Posts: n/a
| Tim Golden <(E-Mail Removed)> wrote:
| > No doubt there are more pertinent answers, but unless this is
| > a learning exercise, you'd be better off investigating Pyro:
| >
| AFAIK pyro is just a RPC implementation for python whereas
| Twisted is a
| completely different beast that happens to have its own implementation
| of RPC.
| How would the OP be better investigating something different, that he
| probably doesn't even need?
| Your comment would be pertinent only if it considered
| Perspective Broker
| against pyro, and I admit I don't know how they compare.

Here's the original post, quoted in its entirety:

I have a program that instantiates some objects and runs a main loop.
Before the main loop starts, I create a thread that listens to TCP
connections on a port. If any connections are made, and depending on
the data, I call methods on some of those objects.

I am worried that calling methods on objects from outside the main loop,
but that are also operated on in the main loop, could cause problems.

My questions:
1) is this safe?
2) what kind of problems could occur?
3) how do I safely handle this?

Now *where* is there any mention of Twisted, either in the original
post or in my reply? As I read it, the OP is doing something which
creates local objects (instances, whatever) and has them available
remotely. He's then -- justifiably -- concerned about possible
re-entrancy if more than one outside agent makes a connection on
his TCP port.

It seemed to me that this was -- approximately -- what Pyro does:
you created objects locally and listen on a TCP port for incoming
requests. Since Pyro's author has already solved a number of the
problems associated with doing this kind of thing, I thought it
might be helpful to point this out.


__________________________________________________ ______________________
This e-mail has been scanned for all viruses by Star. The
service is powered by MessageLabs. For more information on a proactive
anti-virus service working around the clock, around the globe, visit:
__________________________________________________ ______________________
Reply With Quote
Valentino Volonghi aka Dialtone
Posts: n/a
Tim Golden <(E-Mail Removed)> wrote:

> Now *where* is there any mention of Twisted, either in the original
> post or in my reply? As I read it, the OP is doing something which

Ya sorry. I thought this was crossposted but the OP posted 2 different
emails to both python-list and twisted-python ML. This very same message
was posted on the twisted mailing list.

The answer anyway was already given on the other list: there are no
re-entrancy problems .

Valentino Volonghi aka Dialtone
Now Running MacOSX 10.3.7
Reply With Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
question row filter (more of sql query question) =?Utf-8?B?YW5kcmV3MDA3?= ASP .Net 2 10-06-2005 01:07 PM
Quick Question - Newby Question =?Utf-8?B?UnlhbiBTbWl0aA==?= ASP .Net 4 02-16-2005 11:59 AM
Question on Transcender Question :-) eddiec MCSE 6 05-20-2004 06:59 AM
Question re: features of the 831 router (also a 924 question) Wayne Cisco 0 03-02-2004 07:57 PM
Syntax Question - Novice Question sean ASP .Net 1 10-20-2003 12:18 PM