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

Mail from PHP form not always ending up in my inbox?
Hi guys,

I'm a real newbie to PHP and have managed to put together a simple mail form that se

session variables not working anymore
hello,
i use sessions to handle authentication within my site. my host has been changing a lot of

help with this code please?
Hello,

I am trying to build a remote upload script for my image hosting site.

I am usi

ereg_replace issue
hi there people

i have this code happening with regards to my wamp server. is this something

New to Arrays
Hi I am new to PHP (a week and a half now) and I am just beginning to read about arrays. I understan

Not connecting to DB using ruby, error:env.c:257:in oci8lib.so: ORA-12154:
Hi All,

I am trying to connect to the database server from the client server using ruby and f

Sending UDP Raw socket
I truly need help on this. I am trying to write a test program that simulate a network environment

SuperCali PHP Event Calendar
does anyone have any experience with the SuperCali PHP Event Calendar? I could use some assistance

Using system() and bringing back the results
I am aware that you can use system() within PHP to execute system commands, but I was wondering if t

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