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
Did you know?Explore Trending and Topic pages for more stories like this.
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
No comments posted yet

Your Answer:

Login to answer
342 Like 9 Dislike
Previous forums Next forums
Other forums

Working with Global Variables
hi, I'm not really sure why the following code is returning a "Call to a member function getBan

Save cookie to DB
I'm working on a pixel tracking script for an incentive website and I need to use an ASP script to s

insert/update functions for mysql, what do you think?
I am working on two really simple functions that automatically generate (and execute) insert and upd

Getting PHP to ammended the selected in option field
Hey Guys

thanks for everyones help so far. This site and its users are oozing awesomness.

FROM_UNIXTIME($phpdate);
Hello,

I tried to use this :

$date = FROM_UNIXTIME($phpdate);

ANd I was t

Taking an HTML form and a PHP program and making it into one working file.
Hello,

So I would like to display everything INSIDE a specific directory. In other words, I

generate seo frienly url from a text like wordpress
Convert: "åäö" to "aao", "space" to "-", "!?&q

Perplexing problem showing a .jpg
Please disregard..........I figured it out

Variable Clash
In the past I've had variables clash. For example:

Code: <?php
$c = 5;
$ca

simple php table loop
Hi all,

I've the following code

<?php // Create category options

Sign up to write
Sign up now if you have flare of writing..
Login   |   Register
Follow Us
Indyaspeak @ Facebook Indyaspeak @ Twitter Indyaspeak @ Pinterest RSS



Play Free Quiz and Win Cash