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 9
Other forums
mysql_real_escape_string
Let me preface this that I am very much a PHP noob, but I have some SQL training (not necessarily My
SWF image using php?
Hello once again.
My latest en devour requires me to produce an image of a static .swf that i
PHP template help
Ok, I don't know if anyone can help me but I am using PHP templates to make a site. I am a newbie an
how do i make new line after *
First check this page here. and you see my report. Im pulling form a mysql db. I want to beable to m
Question about ShowWindow()
Hello....
I'm struggling with sumpin, and I hope y'all can help.
I've got a CFormView
Help adding strtolower( to my in_array
strtolower i need to add it to this to work, iuno how.
Code: $moderators = array('Admin', 'ba
include
Hi I have this way of licensing my PHP application, and I want to know if you guys can answer some q
Linked Keywords
I am trying to get a script that makes my predefined keyword converted to links and / or converted t
PHP / MySQL Associative Multidimensional Array:
Hello.
I have data in a MySQL Table that adheres to the below: (note, no index, could add if
OPINIONS WANTED
This is my login page code, and I want your opinion on it please!
Code: // Login ~ CHECKS