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

please, need help coding this voting for your favorite car polling system.
hi, my code needs a lot of work, but i want to be able to let users vote on their favorite car, upda

Display certain image depending on time of year
Hi, I am new to these forums and would really appreciate some advice on a piece of coding I have don

Web Application Recipe
Hi Guys!

I am working with the Web Application recipes. I am currently working on the sen

Pspell with my own dictionary
Hello!
I've tested two cases using pspell functions.
1)
Code: $dictionary_link = pspell_new

PHP Search Issue
Hi, I am using the following code to search and return flights from a database. The user searches by

Firefox displaying PHP source code??
Currently testing a site thats almost built, am going to be including php on a sidebar on all pages

Detail Expenses Report by Cost Center
I would like to obtain a report out of SAP that shows a list of expenses by cost center that shows t

Script not running properly
Hello Everyone
This is a basic script for posting to a database. I'm not sure why it doesn't work

present value of sequence?
Hi

Please help me to find out the present value of sequence?

Thanks

urldecode question
How would I format this line of code properly?

<?php echo urldecode($_GET['Title']); ?