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
Did you know?Explore Trending and Topic pages for more stories like this.
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
No comments posted yet

Your Answer:

Login to answer
342 Like 9 Dislike
Previous forums Next forums
Other forums

my sql select id and then update problem.
I need to select some auto incremented ids out of a database and then use those id in a where statem

Email with Attachments in PHP
Hi Friends

How to send email in PHP with attachment.
I know simple mail can be sent with

include
Hi I have this way of licensing my PHP application, and I want to know if you guys can answer some q

Port scanner problem
Hai
recently i developed one app through which u can check the opened and closed ports under an

The IE or FF detector
Hello Friends,

Problem of today ( we seek for php help ) as following ,

we know all th

split values
I have values that are returned to me in this format:

name=>test,age=>49

Memory Allocation
Hi folks,
see this ex:

int v=5;
v=v+10;

then what will do the compiler before th

JSON SORT WITH PHP
I have two products that I want to sort by say "Id:17, value: xxx" using php
The page w

Read from forum
Haven't written anything forever and I would like to get back.
What I'm trying to do is getting t

Check Date/Time in PHP
What I need the code to check is that $reQuest is 24 hours in the past then return a time based on h

Sign up to write
Sign up now if you have flare of writing..
Login   |   Register
Follow Us
Indyaspeak @ Facebook Indyaspeak @ Twitter Indyaspeak @ Pinterest RSS



Play Free Quiz and Win Cash