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

PHP submit form script causing blank page
Im trying to submit a form using this script, however nothing shows up on the page, does anyone know

newbie question about multiple queries
hi everyone,
I'm sorry to ask such a basic question, but I'm young and trying to learn php on my

Form errors in an array
I'm processing a form and putting the errors in an array. empty($errors) doesn't seem to do the tric

check if value exists
I have googled this for a while and I am getting lots of different results. Is there a standard meth

Quick fix: Conditional statement with an array
Hi, I'm getting the temperature value off of the Environment Canada website along with the icon file

PRotect my POST DATA... FROM HTML ATTACKS
I need to like let's say

If a user submit's his Prayer and he put's <meta refresh stuf

Problem writing URL into database
How would I write this into the database?

<?php echo "http://".$_SERVER['SER

php automatically escaping single quotes
I'm trying to test out my security a bit and I've noticed that php is escaping my single quotes. For

Javascript or not?
How many people prefer javascript/ajax sites? How many prefer the good old fashion straight php sit

Users and Groups with PHP Classes
Hi,

I have setup what I hope to be a good working User class. Now I want to introduce group m