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

Unable to customise toolbar in FCK
Encrypt php code?
Is it possible to encrypt php code in files,
so that it displays a load of unreadable characters

CE 7.1 and External GIS integration
Hi All,

We want to develop an application on CE 7.1 which uses GIS features from an exter

Namespace Problem
I'm having problem with a section of code with a variable namespace.

This code works fine:

Save User Inputs while javascript reloading!
hi..
i have written a PHP code in which i reload the page when user selects a value in dropdown..

Batch Related Pricing
Hi, I need some clarity on the batch related pricing

For example the following are the b

writing a screen scraper
Hello,

I'm writing a screen scraper application and want to be able to get absolute addresses

Facebook status update API
Hello,

So, I'm trying to create my first Facebook application with PHP.

Basic ideas fo

need a script for 3 pages
I have a customer who wants me to set up a site with a number of pages with the following requiremen

Asset Transfer from One plant to another within same company code
Hi,

Please advise how to transfer one asset from one plant to another plant within same c