Sequencing or queuing parallel process

Posted on 16th Feb 2014 07:03 pm by admin

Scenario is as follows
There is one parent process say P1 and 4 child processes say A B C D

Process A starts at 3:00 pm
Process B starts at 3:15 pm
Process C starts at 3:30 pm
Process D starts at 3:45 pm

Process A take 1 hour for completion and process B,C,D takes 10 mins for completion
At a time only one process is allowed to execute since these process shared some common resources so at any point of time only one process is allowed to execute. but these are scheduled job so process B, C, and D must wait till process A get completes

so process B must wait till 4:00 PM for execution
and starts at 4:00 PM
process C must start at 4:10 PM after completion of process A and B
process D must start at 4:20 PM after completion of process A and B and C
so these sequencing also should maintained

B, C and D cannot start unless and until A is get completed and user dose not know
How much time A will take so B,C and D must wait for completion of A and after A completes then and then only B,C and D execute in a same order

so how to implement wait mechanism for this scenario?

Currently i have implemented a lock mechanism where first process A will create a lock file and process B,C and D will continuously poll this lock file and as soon as process A finishes it will release a lock on and whichever process acquires a lock first will get executed first but here sequencing is not maintained and process executes randomly

so what kernel objects like event, semaphore are needed to solve this scenario.

please help to solve this scenario of process waiting for execution in a queue.

-Thanks

Your Answer:

Login to answer

Other forums

Effort Estimation Template for Steady State Support
Hi Everyone,

Is there any SAP provided template/format for system change and enhancements

array empty
Hiya peeps,

Ok here is the codes.

order.php

Code:

Different actions for different parts of a string
<?php
function dosomething($string, $else = '') {
if (empty($else))
$string

Links not updating
I'm trying to fuel a simple navigation system for a news section. It works fine when it comes to ret

Extract text from string
Hi folks,

I have a string that looks like this:

aaaaaaaaaa:
bbbbbbbbbb (ccccccccc)

need Array help
This is what I have to do.
$teamname[1] = "Red Sox"
$teamname[2] = "Gian

ASP.NET 2.0 - Enter Key - Default Submit Button
Hi,One of the most annoying things in developing web pages is handling the "Enter key" for form subm

Turning Data into URLs?
This may seem very basic to you, but I'm having a hard time figuring out how to do this since I don'

Running a cron job through PHP/Apache?!
Hello all,
I have a PHP script which makes a cron file from user input. When i try to run the cro

$action = "insert"; //$action = $_GET['action'];
$action = "insert";
//$action = $_GET['action'];

why is this invalid type? I am