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

InternetOpenUrl() Invalid cert
Hi all,

Does anyone know how to prevent calls to InternetOpenUrl() from failing with erro

difference between datetimes
($row['totime']-$row['fromtime'])/60

this is giving me 0

example of totime and fromtim

Xml parsing
I need a suggestion about parsing xml with multiply parts like pervious...
i.e. different device

Apart from cron
I need to run a php file every one hour. Is there any other solution apart from cron job?

Header is not working in IE
Hi ! header function is not working in IE but it works in FF, Safari, Chrome. any help please. :

problem with refreshing
in my site, i have an index page, it has a main div. this main div's content is changing according t

getting most records by count
Code: [Select]<?php

$connect = mysql_connect("localhost","dam

Which practice of iteration through containers is preferred
In the "real world" what kind of loop do most people use to iterate through a container like a vecto

Upload simple problem
Really confused!! I run once and it worked, but when i tried today...it didn't work

Which par

Query failed issue with php script but works fine in mssql manager!
hi i have the script below which copies data from one table to another but will only insert new data