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

No comments posted yet

Your Answer:

Login to answer
342 Like 9 Dislike
Previous forums Next forums
Other forums

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

Having Problem with Date
l have a submit buttom where user have the possibility to add a date to specify when his message s

Posting to another Site?
I have software that people install.
When they install it, is there a way to make it post their d

Undefined index: username HELP NEWBIE
I am trying a simple login/logout for my website. It works well with checking if the username exists

IP Logger for Voting Script
Can anybody help me place an IP logger into my voting script?
I know that maybe it is not as secu

puting for loop in 1 value
hi ,

how do i put this code in 1 value:
Code: <?php
for ($i=1; $i<=5; $i

Extract text from string
Hi folks,

I have a string that looks like this:

aaaaaaaaaa:
bbbbbbbbbb (ccccccccc)

Placing and array within an array then sorting it!
I have a page that runs two large mysql queries and saves the results into arrays, in php I then per

Sufficient protection from bad input?
I am writing a simple script to let people upload 'pages' of their own content, be it simply a few b

PEAR Email Attachment w/ $gpg
I have no issues with this code if I take out the attachement section and include the info in the em

Sign up to write
Sign up now if you have flare of writing..
Login   |   Register
Follow Us
Indyaspeak @ Facebook Indyaspeak @ Twitter Indyaspeak @ Pinterest RSS



Play Free Quiz and Win Cash