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

SQL Injection
In my attempts to protect my database from mySQL injection I have created another problem for myself

License Issue - service type user
Hi,

I would like to understand the following issue regarding sap license.
I wish to

Error in Configure System Landscape Directory phase
Hi

We are getting the error in Configure SLD phase ( 41 of 44 phase).

Please f

why preg_match_all does not return the number of matches
My regex looks like

X[^x{4e00}-x{9fa5}]*Y

(where X and Y are two Chinese characters)

Calling a Procedure with IN & OUT Parameters
Hello,

I usually call my procedures using the following way

declare variable e

Looking for help reading a .txt or .ini file and outputting the info.
I have a file called Info.ini and It has the following info:
Code: [General]
Online=0
I wou

Help on Order Entry Form/System Where is best to begin.
I have a dilema and a very short amount of time at this point and I'm looking for some help on decid

$_POST variable un-useable
I'm trying to use a $_POST variable in a mysql update statement but i can't use it for some unknown

PHP Login
Hey!
I got this shopcart code online, am trying to modify it but am getting an error when i try a

Need help with unexpected T-STRING error
I'm a newbie and I'm still learning PHP. However this error has me stumped. I've googled, searched t