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

retrieving policy name inside the function called by this particular policy
Hi there,

I've playing around with dbms_rls package, trying to set up some security repo

How to refresh a parent page from a modal popup
Hi,I have a modal popup in which I need to upload a file and store in the database should give a mes

Any help with my email script?
I have an email script, I have not tested it, although someone tested it for me and said it worked f

Generating unique numbers using php
Hi,
I need help in generating unique number using php.I tired using rand() in php.But, by using r

$_FILES array
Ok,

I just started experimenting with PHP today. My goal right now is to have people be able

SuperCali PHP Event Calendar
does anyone have any experience with the SuperCali PHP Event Calendar? I could use some assistance

batch file not building to webapps folder
Hello. I just started running Vista :P and can't seem to get my projects deployed. I found out how

Displaying returned XML in another PHP page
I have an online payment form that will return XML given if a payment is successful or declines. I

Contents of variable not echoing
Hey guys, hopefully this is an easy one...

In this line, the variables are not echoing out. T

NOOB needs help with upload file
The intent of this form is to create a folder for a client and upload an image into another folder '