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

Echoing If Function?
A script I am using has If statements in the comments form to basically tell the form what to do. Cu

php include email form with attachment
I have had no luck with finding a email form all over the Internet for various reasons. Some insecur

SAP Project Module
I have seen in the SAP Project Module,plan cost and budget are not equal and even difference is sign

Custom array sort? asc then desc
Any ideas how I could sort this array? I've been trying for a while. Maybe with usort, but I have no

j1inmis Ouput layout changes
Hi,

Can anybody tell how can j1inmis output layout can be changed so that vendor names ge

=> and <=
So I was digging through some code when I came across the <= operator. This is the first tim

newbie question about multiple queries
hi everyone,
I'm sorry to ask such a basic question, but I'm young and trying to learn php on my

Drop Down and text box issue
Is it possible to set a drop down list and text boxes to a certain width?

here is my code

News script
Hi ...

I am not sure if this is the rite place to post this but if its not sorry

i am

upload photo limits
ive got a upload photo script and im just trying to make more secure currently it limits size and as