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

modifying query string with no page refresh
Hi everybody,
I've tried to get info about my problem all over the internet but i didn't find out

Help on query replacing the date
Hi Pals,

i want to replace the current date in a column to some value say C or D or any n

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

Getting Resource id #11 while trying to connect..
So i tried using "DEFINE" for the first time and im using the variables i defined to conne

rookie looking for help coding a CSS form with PHP
I'm trying to figure out how to add PHP code to my xhtml form so that it is a working form embedded

reading partial code from external site
Hi,

I am trying to write a script for my website to get an article from an external website.

Coding Critique
I was hoping someone could take a second and look down my code and see if they see any problems with

Changing color in GD via variable?
Hey guys, I'm new here. x)

I'm very much a noob when it comes to PHP, but I'm trying to learn

Hom to make one url to open together with another url
I have a chat, which i want to be opened, as soon as the users login to the site. As it is now, when

Grabbing Values From an Array for Posting
I have a grid array that I am using with a form that when it hits the currently named test.php it lo