Re: Continuation based app servers

On May 31, 2:33 pm, Pascal Bourguignon <p...@xxxxxxxxxxxxxxxxx> wrote:
Slava Akhmechet <coffee...@xxxxxxxxx> writes:
Here is what I want to support:

(defun authenticatedp ()
(if *authenticatedp*
t
(do-modal #'login-or-register)))

(defun some-action ()
(when (authenticatedp)
(do-action)))

The key is 'do-modal' - a construct that shows a login page (which can
manage rounds of user interaction), and returns the result of the
login operation as if it were a simple function call.

I don't need continuations to achieve this functionality. The trick,
saving the stack, can be done with threads. Whenever 'do-modal' is
called, it can spawn a thread and assign it to the current
session. All interaction will then be executed by that thread while
'do-modal' blocks the original thread and waits for some signal from
the new one.

It can work.

The problem you have is that there is a limited number of threads
possible in a process (around 300 or 400). Therefore you can handle
only a limited number of concurent modal sessions (around 150 or 200
if you call recursively do-modal only once per session).

--
__Pascal Bourguignon__ http://www.informatimago.com/

NOTE: The most fundamental particles in this product are held
together by a "gluing" force about which little is currently known
and whose adhesive power can therefore not be permanently
guaranteed.- Hide quoted text -

- Show quoted text -

Slightly out of topic , how do you handle number of concurrent
threads. (Purely theoretical) I was thinking of something like
prespecified maximum number slots and a waiting list .

.

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