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

Accessing element of object array
Hello

My object looks like this:


Array ( [0] => User Object ( [id] =>

Empty text file when there is over XXXX lines of text.

define("RANDOM_FILE","/public_html/random.txt");
$randomEntry = "

Help uploading .JPG
I have a problem with upload images when the ending is .JPG capitalized.. I really don't know what c

Looking for help on using joining mysql tables and php....
Does anyone have any good links to references on how to pull mysql data, through joining tables and

Images outside webroot
Im hopeing someone can help me with this because i cant figure it out.I have setup an ASP.NET websit

limit string by words??
hello all,

I was wonder if there is a function to limit a string by the number of words inste

iMatch stored value with the current value in a loop
Hello,

I have a MySQL db were I store articles in.

I have a form to fill these article

Multiple while loops
I have several DB queries that I know should be returning results and aren't. I have a feeling it ha

Question about ShowWindow()
Hello....

I'm struggling with sumpin, and I hope y'all can help.

I've got a CFormView

How to set pass login name from htaccess to php
When the user logs into my members page via htaccess, I'd like to retain the username so that I can