NYCPHP Meetup

[Ben Sgro (ProjectSkyline)]

Hey again,

Good point.

I've simplified this all into two small scripts.

If anyone is interested in the solution, contact me off
list and I'll send the source.

I will have an additional sanity/mantience script that ensures no
job runs longer than a given threshold.

Thanks for the help.

- Ben


----- Original Message ----- 
From: "Dan Cech" <dcech at phpwerx.net>
To: "NYPHP Talk" <talk at lists.nyphp.org>
Sent: Thursday, April 19, 2007 3:50 PM
Subject: Re: [nycphp-talk] IPC Problems


> Ben Sgro (ProjectSkyline) wrote:
>> Hi All,
>>
>> I'm trying to write a script, that forks children to each run a job, 
>> provided by
>> the parent in the form of a job_id, passed by IPC msg_send( ).
>>
>> Now, when I run the job, I get some problems w/the DB loosing the 
>> connection.
>> I also have problems w/the job_id that's get passed ..sometimes, somehow, 
>> its the
>> PID...I dont get it.
>>
>> It seems like the IPC is all over the place ... I've included the output 
>> from the script,
>> the database tables, and the source of the script.
>>
>> Any help is greatly appreaciated. I've read the php.net pcntl_and msg- 
>> (IPC) stuff over and over.
>
> It sounds like you might be making this more complicated than it needs
> to be.
>
>> What the goal is:
>> 1) Parent, selects the next job to run.
>> 2) Marks job as active =1, stores the PID
>> 3) Forks off a child to run this (job_id passed to child via msg_send( ))
>
> The child can read the job_id from a variable set in the parent before
> the fork, why not just do this?
>
>> 4) Child runs, finishes job and marks as active = 0, incremenents run 
>> count, tells parent to kill them
>
> Why does the child need the parent to kill them?  A call to exit() at
> the end of the child section should do the trick just fine.
>
>> 5) Rinse lather repeat
>
> Hope this helps,
>
> Dan
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