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
Multiple includes losing variables
Hey all,
just starting out w php and ran into a problem pretty quickly. I'm
including seve
tell csv import script to ignore blank rows?
Hi i have the below script but i get an error if a row is blank ie a return in the csv file at the e
Help with Password Encoding/Decoding?
Trying to design a "change password" tool. On my signup code I'm using base64_encode, now
Mass activity scheduling
Hi experts,
Im facing some problems to deal with mass activity jobs.
When I run some
registration form
first time posting. did some searches but didnt find exactly what i am looking for. dont flame cause
Weekly Calendar
Hi, I am looking at creating a weekly calendar. The calendar will read from Monday - Sunday. Does an
php require help needed
Ok i tried to use the search funtion but the word require is everywhere.
i'm really new to cr
PHP Display Telephone Number On Referrer
I have used the php below to show a different telephone number in the header of the site depending u
Weird Problem with curl while sending data
I am facing a weird problem with sending data to a site via curl.
If i send the value by this
Add "width" check when upload
Hi!
Can someone add a function that is checking if picture witdh is bigger then 800px whwn up