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

wav to mp3 + goDaddy
I need to convert wav files to mp3s. From what I have found so far one way to do it is to have my PH

Random Number Generation And Probability
Hello, I am working on a function which has to insert data into a SQL table.

we have to suppl

help understanding hidden input w/ php
hello i'm doing a tutorial where there are multiple forms for an edit page for a user to update thei

Match 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

Printer configuration
Hi All,
Suppose one of the user deleted the printer settings unfortunatly ,then what is the pro

Login Control?!
I have a Web Site that uses the login control also I have set the destinationurl to the page I want

simplexml_load_file and rss problem
Hi,

I have a problem parsing an rss feed using simplexml_load_file - this is strange as i hav

RSS poster script?
I have found a script that posts RSS's for me on a site that I'm building. However I would like to a

Menu restriction
How can I restrict the individual menu that would appear when a user logs in so that all users are c

Downloading file (Headers)
I'm trying to make users download a file, but they must wait 60 seconds before it begins.

But