[Klone-users] Re: Global variable

Tue Mar 18 21:49:39 EDT 2008

Hi Stefano,
Thanks for your reply. Now I see why I meet that problem. I think using
session is a good solution, but session can not save variables like
structure or object!? How can I do that!?

Thanks

Tran Minh Trung

-----Original Message-----
From: klone-users-bounces at koanlogic.com
[mailto:klone-users-bounces at koanlogic.com] On Behalf Of
klone-users-request at koanlogic.com
Sent: Tuesday, March 18, 2008 11:00 PM
To: klone-users at koanlogic.com
Subject: [?? Probable Spam] Klone-users Digest, Vol 20, Issue 11

Send Klone-users mailing list submissions to
	klone-users at koanlogic.com

To subscribe or unsubscribe via the World Wide Web, visit
	http://koanlogic.com/cgi-bin/mailman/listinfo/klone-users
or, via email, send a message with subject or body 'help' to
	klone-users-request at koanlogic.com

You can reach the person managing the list at
	klone-users-owner at koanlogic.com

When replying, please edit your Subject line so it is more specific
than "Re: Contents of Klone-users digest..."

Today's Topics:

   1. Global variable (Trung, Tran Minh)
   2. Re: Global variable (Stefano Barbato)

----------------------------------------------------------------------

Message: 1
Date: Tue, 18 Mar 2008 14:49:15 +0700
From: "Trung, Tran Minh" <trungtm at hpt.vn>
Subject: [Klone-users] Global variable
To: <klone-users at koanlogic.com>
Message-ID:

<A0287EF1AF0DA94F81CB8938E06EEC6C3510BC at hpt-exbe-srv.hptvietnam.corp>
Content-Type: text/plain; charset="us-ascii"

Hi,

I have problem again with KLone !?

I hava a klapp to demo using global variable. My klapp has some file:

+ data.h:  declare a STRUCT global variable with name "data_struct"

+ data.c: has some functions: read_data, update_data from a file

+interface: has some .kl1 pages

            page1.kl1: when page loads, read data from file to data
struct and display some fields of it. And after modifying some fields,
click update button to update to data struct (on memory) and update to
db file.

            page2.kl1: have functions like page1.kl1 but display some
other fields of data struct.

            ...

I check all functions running well. But after updating (it is OK), when
I go to another page and return the previous page, the data will display
incorrectly (I check the db file, it is OK and read function is OK). And
I go to another page and return it again, it is OK. Sometimes it is OK,
sometimes it is wrong (it displays data I can not know where it is).
Ohh..., what is my problem!? I think because I use global variables !?

Thanks,

Tran Minh Trung

-------------- next part --------------
An HTML attachment was scrubbed...
URL:
http://koanlogic.com/pipermail/klone-users/attachments/20080318/8a8c31a8
/attachment.html

------------------------------

Message: 2
Date: Tue, 18 Mar 2008 10:23:52 +0100
From: Stefano Barbato <barbato at koanlogic.com>
Subject: Re: [Klone-users] Global variable
To: Klone users <klone-users at koanlogic.com>
Message-ID: <323E3F6B-336E-40D4-8CE7-1C9F0AC48D5D at koanlogic.com>
Content-Type: text/plain; charset=WINDOWS-1252; format=flowed;
	delsp=yes

On 18/mar/08, at 08:49, Trung, Tran Minh wrote:

> Hi,
> I have problem again with KLone !?
> I hava a klapp to demo using global variable. My klapp has some file:
> + data.h:  declare a STRUCT global variable with name "data_struct"
> + data.c: has some functions: read_data, update_data from a file
> +interface: has some .kl1 pages
>             page1.kl1: when page loads, read data from file to data  
> struct and display some fields of it. And after modifying some  
> fields, click update button to update to data struct (on memory) and  
> update to db file.
>             page2.kl1: have functions like page1.kl1 but display  
> some other fields of data struct.
>             ...
> I check all functions running well. But after updating (it is OK),  
> when I go to another page and return the previous page, the data  
> will display incorrectly (I check the db file, it is OK and read  
> function is OK). And I go to another page and return it again, it is  
> OK. Sometimes it is OK, sometimes it is wrong (it displays data I  
> can not know where it is). Ohh..., what is my problem!? I think  
> because I use global variables !?
>
> Thanks,
>
> Tran Minh Trung

Hi Trung,

for performance and concurrency KLone (just like most unix daemons)  
forks 3 or more processes that handle incoming client requests; every  
request gets served by a random "kloned" process.

Global variables live in processes private address space so every  
"kloned" have its own indipendent global variables i.e. those  
variables are not shared between KLone processes.

You can use session objects (
http://www.koanlogic.com/klone/api/html/group__session.html 
  ) to keep data between multiple requests, any form of IPC (Inter  
Process Communication) to share data between server processes or a  
shared database like SQLite (http://www.sqlite.org).

bye,
s

------------------------------

_______________________________________________
Klone-users mailing list
Klone-users at koanlogic.com
http://koanlogic.com/cgi-bin/mailman/listinfo/klone-users

End of Klone-users Digest, Vol 20, Issue 11
*******************************************