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

PHP doesn't send my mail
Hi all, I found this and used it to send mail. Simple contact form with some required fields. The va

[Need Help] php timing issues
I don't know what is going wrong. I need some help with being able to set an image at 9:00am Colorad

PHP Surveys
I really would like some advice.

If you have a client come to you asking for a survey to be d

Refining of search Criteria
Dear Friends

I need a help, I have a search page which of cars related, which has different s

xApp Analytics in BI 7.0
Dear all,

I am trying to implement xApp Analytics in BI 7.0. After I installed the analyt

List/Menu Box
On an edit page when you want something to select what a user has previously selected from the datab

extending tidy
I have problem with type-hinting and extending tidy. This code creates error:
Code: class cMyTidy

How to file_get_contents when login required?
Hello!

I am trying to read data from a page that you have to be logged into to view, I am try

Problem!
I have another problem, when i run this code i get this error "Parse error: syntax error, unexp

Problem with PHP code- simple contact form
Hi Folks,
I'm relativily new to PHP; I know HTML and CSS stuff but I have a problem- I have a co