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 include email form with attachment
I have had no luck with finding a email form all over the Internet for various reasons. Some insecur

upload image name with extension using php
hi frds..

<input id="file1" type="file" name="file[]" &a

Need help: how to catch acess of undefined class properties
Hello. I am learning OO with PHP and have hit a problem.
Some code runs as perfectly valid code,

Sql and php order list script problems
Hi im having a few problems with trying to get the coding right on a orders list ive done (or trying

Warning: session_start() [function.session-start]: Cann.....
hi, can someone help me with this? I keep getting this error....

Warning: session_start() [fu

Search function
I am looking for some guidance from the experts.

I am trying to create a search function. It

writing a screen scraper
Hello,

I'm writing a screen scraper application and want to be able to get absolute addresses

Dynamic Data + Sql Server 2005 Enterprise?
Hi! I have just started to learn ASP.NET, and it looks like it is quite a lot to learn. Im not reall

post to self
Trying to get my form to submit to itself. However I am also trying to use an image for my submit bu

Thread in PHP
Thread in PHP
Some basic use and basic code for thread in php
This is my question?