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

Problem with passing variables
I'm not really a php programmer so I'm really struggling with this issue.

I have a banner s

Data storage spaces in varchar2
Trying to understand what's happening.
I am selecting a value from a table that is defined as c

Please help with SMTP Authenticated PHP Email Form
Hello, I'm creating a PHP email form, and for this particular server, I have to use SMTP Authenticat

PHP Array quick help
I need

$_SESSION{'username'} to be like this:


if $_SESSION['username'] = "gay

switch not getting value
what am i doing wrong?
i want to populate the country list according to the category
i want to

Deleting Partners on the Customer Master.
Does SAP handle removing the Partner from Open Sales Orders when a Partner is deleted in the Custome

Multiple while loops
I have several DB queries that I know should be returning results and aren't. I have a feeling it ha

Async WSAConnect failed on XP with error code = 2 ("File not found")
Hi all,

I have very strange bug, please help me if you can.

It is reproduced o

Include ("Absolute Path") of a file?
I'm not sure what I'm doing wrong. I am writing my php code in the same directory of the file that

Execure stored procedure on a timer
Can someone tell me an easier way to execute a stored procedure on a timer? I am using Oracle 10g R