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

need help with mail()
hi i want to send an email with attaching pdf file using php. i have the following script but the pr

Creating a function
Basically i wanna put all this code in a seperate file

Code: <?php

Why does my crawler script suddenly end with no error?
Hi.

I have written a web crawler script. It will visit a large number of URL's with cURL.

Count Session and Trigger Events
I am New in PHP, seeking a method to count logged users by counting the sessions or any …, is

Database/Table Collation
What is the Database, and table collations used for? i don't understand what there used for since co

Calculating n! using vector
#include
#include
#include

using

Gaining access to Drop Down Menu Variable
code is below, I am creating a drop down menu. I want to echo the value selected in the drop down me

How to file_get_contents when login required?
Hello!

I am trying to read data from a page that you have to be logged into to view, I am try

confused between ' ' and " "
there is a php i set:
$begin_date_query = mysql_query( "SELECT SUBDATE(due_date, INTERVAL $d

Credit card verification
I have a client who wants to process credit card transactions from his web site rather than the goin