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

unexpected T_ENCAPSED_AND_WHITESPACE, expecting T_STRING or T_VARIABLE or T_NUM_
Can anyone view my code and tell me why im getting the error:
Parse error: syntax error, unexpect

Simple program to copy files between two computers over the web
I use logmein free and often need to move files between my two computers. Generally, I move the file

a dificult string search
Hi I don't know a way around this. I want the user to input a password, but to make it a bit complca

MySQL Primary key gap
Alright, so I have a table with 26 entries in it (id, filename, caption) for my image randomiser (ht

Socket Server Response Headers
Earlier I had a post about my Socket Server, I wasn't able to get it to connect, now I can

I

Pls help with PHP
Pls can anyone direct me on how to create a user account for a customer. For example i want know if

PHP loop
Okay so I have several "articles" stored in a mysql database and am attempting to echo tho

Quick fix: Conditional statement with an array
Hi, I'm getting the temperature value off of the Environment Canada website along with the icon file

Sharing PHP Sessions Across Domains
I am in the process of writing a script to share a php session across various domains I have.
The

PHP login form help (Done Most of It)
Hi i am having a problem, when i try logging in it is always saying "Invalid Login" im not

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