I am a newcomer to WebWare and I would like to learn this framework. Is a book about this somewhere? It would
be better for me to have a book to practice some example. I would apprciate any information.
Best regards,
Nader
On 6/20/06, [EMAIL PROTECTED]
<[EMAIL PROTECTED]> wrote:
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Today's Topics:
1. Re: Dead threads: detection and recovery (Oliver Bock)
2. Re: Dead threads: detection and recovery (Oliver Bock)
----------------------------------------------------------------------
Message: 1
Date: Tue, 20 Jun 2006 13:53:44 +1000
From: Oliver Bock < [EMAIL PROTECTED]>
Subject: Re: [Webware-discuss] Dead threads: detection and recovery
To: "Discussion of Webware for Python including feedback and
proposals." < webware-discuss@lists.sourceforge.net>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Ben Parker wrote:
> ... If management is
> pushing for those kinds of development capabilities in order to drive
> their business, you should push back that their requirements demand more
> knowledgeable staff.
>
While I agree with your suggestions, they unfortunately won't fly.
Oliver
------------------------------
Message: 2
Date: Tue, 20 Jun 2006 14:32:53 +1000
From: Oliver Bock < [EMAIL PROTECTED]>
Subject: Re: [Webware-discuss] Dead threads: detection and recovery
To: "Discussion of Webware for Python including feedback and
proposals." < webware-discuss@lists.sourceforge.net>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Shayne O'Neill wrote:
> Does python have a sort of cooperative "pass" command? Whilst little
> (other than an external monitoring process, assuming the monitor gets a
> chance to do its thing) will stop someone writing this code;-
>
> while 1==1:
> echo "hi mum"
>
> a call like
>
> while 1==1:
> one_of_our_calls()
> echo "hi mum"
>
> could be dealt with by having regular 'pass' type commands liberally
> inserted into various api calls. Now, granted it's a little bit hacky to
> do that, but it may well work.
>
Unfortunately they often won't call any of my functions within their
loops. After looking around for other people's solutions to the general
problem of killing Python threads I've discovered that I could install a
debugging interrupt into all my threads, but I think searching for a
kill between every byte code will be too slow.
> One thing to keep in mind, is that python (and most any language, except
> perhaps 'managed' code like java or .net) threading implementations will
> change from OS to OS.
>
> but there should be some sort of 'pass' command.
>
> Actually, now I think about it , a simple 'wait' type thingo should do the
> job.
>
Sensible people point out that killing a thread is a dangerous business
because it may hold locks and is O/S-specific. The alternative is to
trigger an exception in another thread. This is safe, but won't help
with blocked I/O calls, which is fine with me. There is a patch to do
this
(http://mail.python.org/pipermail/python-list/2003-February/148999.html ),
but it appears not to have been adopted. I'm not game to apply a Python
2.2 patch to the latest Python code so I think that line of inquiry is
closed.
That leaves me with the option of monitoring my running threads. If I
discover that more than two-thirds of them are unresponsive then I can
kill and restart AppServer. If I do this quickly then there won't be
any interruption in service.
Oliver
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