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

mr8m - reverse document
Friends,

I'm trying to reverse a document held by MIRO, but it reports the message balan

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

Multiple arrays inside data
Hi,

Simple question. I have a column called "array" in my database, and inserted in

Please help with code for SMTP authenticated PHP email form
Hello, I'm creating a PHP email form, and for this particular server, I have to use SMTP Authenticat

Storing/displaying image urls in a database?
Hi
Basically I have the following scenario:
User chooses picture from list. Picture info is ad

Merger of 6 sister companies under one flagship company after go live
Dear Experts,
I need one help regarding Merger of sister companies of same group. currently we

WHYISNT THIS MYSQL STATEMNT NOT WORKING? (php)
caps because its absolutely rediculous.
i dontunderstand why its not working. there is a column c

PDO returns erroneous columns from within pdt
Hi All,

This is a truly weird behavior:
When using a simple pdo fetch, erroneous columns a

form submit at godaddy?
Trying to test form submission at GoDaddy and it does not seem to work. Here's the page...

h

Help? Need help on project with templates involving mysql and php.
I'm having a hard time explaining what I want but basically here is what I have in place:

-Da