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

No comments posted yet

Your Answer:

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

PHP / MySQL Associative Multidimensional Array:
Hello.

I have data in a MySQL Table that adheres to the below: (note, no index, could add if

jquery validation in codeIgniter
hai i need to add client side validation to my fiels which are selected in a forloop.the fields are

Php WordPress help
I am writing the following code for making a plugin

<?php
header("Content-Type

Seperate team from score
I am writing a site that does a NFL Pick 'em type application and I have a feed that gives me the sc

Problem with HTTP Caching...?
Hi there, im trying to implement caching. But it doesn't always work.
I post it here because ther

Sorting JTable on more than just the values listed in the columns
I have a collection of objects that store (among other things) two integer values. I only want to di

Replacing a string on click of a button
Hi! Is there a way to replace a string on a click of a text link?

This is what I've come up w

MySQL-PHP Query Results Help
Hello all. I'm hoping to be able to get some help in solving a problem with query/rowcount output. I

Need help with unexpected T-STRING error
I'm a newbie and I'm still learning PHP. However this error has me stumped. I've googled, searched t

Saas with SAP R/3
hi experts,

Is SaaS offer available in SAP? for SAP R/3? from where i can get the info a

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