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

UDP server recvfrom() always returns -1? :(
Hello all,
I am getting a very strange error in my code :( I am writing a server application in C

Keeping track of php uploads
Hello all.

I was looking at the way PHP handles file uploads.
It seems that PHP uses a tem

i need help with php header and footer
I have designed a header and footer for my site and they seem to be ok when they are running individ

New to PHP and just trying to understand a little code.
I hope I'm not annoying anyone or breaking the rules but I was wondering about this bit of code righ

how do i make a string??
hey guys,
can someone please tell me how to put data from the glob function into a string

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

h

CURL question
i am wondering if it's possible to use multi curl with login something like

login once to web

How to Handle more than one submit button in single form?
Hi
I have one PHP file which contains one Form. In this form there are two Submit type Buttons

noob cURL help
I have a pretty basic form that I need to cURL post to a file in my includes folder (includes/login.

Multi-user card game
I'm writing a batch of games and such. Lottery is finished, Poker,blackjack,etc are next. They will

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