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

Help with syntax
Hi all!

The $bridge variable is not getting passed while it is contained in the line below:

Need help to identify this error please
:confused:Can anyone help me tell what this error message means? Maybe tell me where to look to fix

Get value from Select menu
Hi!

Have tried to find the solution on the web. Don't know if there is an easy one. A descrip

Character increment
Hi,

I am facing a scenario like above,but in my case i want to show up like Col A,Col B etc..

php not working written for consumption of slots
1. Here is the function where i will be allowed to consume the slot booked by me.

2. Here i c

split values
I have values that are returned to me in this format:

name=>test,age=>49

str_replace help
I am thinking str_replace is my only option to filter outputs from my database to convert them to sa

form variables from database help.
Hi all,

I would like to have a form that gives you options based on the results of an mysql q

Create multiple (n) arrays
Hi there,

I have the following need:

I have 2 arrays (coming from a databases)

phpMailer will not connect using SMTP
I am trying to use phpMailer with smtp:

Code: [Select]$mailer = new PHPMailer();
$mailer-&