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  3. October 2021

Re: Prestart Jobs for speeding up TCP/IP servers

Hello Alan,

Am 26.10.2021 um 16:06 schrieb Alan Campin <alan0307d@xxxxxxxxx>:

No, that is not how socket servers work. The socket server is just sitting and listening for connection requests. When it gets one it forks a new process.

Okay. Now comes the interesting question: There is no fork() call in IBM i. How exactly is this "forking" done?

That process receives the request and then spawns a new job to do the processing. That job is a pre-start job so it can start instantaneously.

You mean, it can *run* instantaneously, yes? What are the important bits of the innards of a PJ program? I did not find information about that yet. What triggers it to run instead just lingering around activated (by the SBS?)? What needs to be done to make it go back to activated-but-finished-with-work state? Especially in hindsight on C being used.

Thanks!

:wq! PoC


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