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

Material Master Update through BAPI - Follow up material not updated
Hi Experts,

I am updating the material master through a custom transaction using the BAPI

Javascript form submit and radio buttons?
When this form is submitted, it is automatically resubmitted using JS.

All my fields are carr

How many users online in the last 24-hours using time()?
I'm fairly new to PHP. I have a MySQL table called 'users' and a field called 'loggedin' which is in

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

Image loading
Hi Developers,

I'm trying to display an image from images/image.gif getting the url from mysq

upload only text files
hi guys i want to upload only text like like (pdf,note pad and ofiice files) so can any one please t

query help
Hi experts.

i have a table rep2 like this
PROD_COD ACCT_NO DUE_DAYS BALANCE

need help with mail()
hi i want to send an email with attaching pdf file using php. i have the following script but the pr

Multiple Options for a Single Page
For this example I want to use the Handlers option which is under Fed Admin and all the related codi

problem with php mysql query
Hi guy's...

I'm totally lost here..because don't have any idea how to make a query for grab r