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

Create or replace package is ending ORA-21700
Database 9.2.0., patch 8 (9.2.0.8.0).
I trying run
create or replace package ....etc.

Problem assigning value to variable in "IF" function
Does this script makes sense? I am trying to take the value that is set to "authenticat" a

Multiple Options for a Single Page
For this example I want to use the Handlers option which is under Fed Admin and all the related codi

function to return url
Hi,

Can you guys help me giving a function that takes all the contents in a particular field

* Gridview and Detailsview in UpdatePanel, insert mode problem
I have a GridView and DetailsView working together. When a record from Gridview is selected, Detail

Preg_match with an array
is there an away to use preg_match with an array?

i want to check a string with an array to s

Need a fuction to count entries in a field
Hi
I need a fuction to count how many times a email address is entered in to a field.

I ma

$_POST
Hi, I have 2 seperate php files, and i want my $_POSt["fname"] To go into both of them, Fo

how to remove in php string display
My code is $message="We're looking at developing our website."; $body= "My mess

Content-Disposition: attachment; filename=... not working as i thought it should
taken the following code from the php.net site the script is not working.

what is not happeni