[Rails] Re: How to Synchronize?

Frederick Cheung wrote:
> On Jul 2, 11:10�am, Onur Gungor <rails-mailing-l...@andreas-s.net>
> wrote:
>>
>> First I suspected that this problem is originating because Passenger was
>> spawning processes and they are not sharing the mutex. But I checked the
>> documentation but couldn't find a mention of it. And in this link
>> (http://m.onkey.org/2008/10/23/thread-safety-for-your-rails) it says
>> that it's OK to use Mutexes (though not mentioning the multiprocess
>> passenger).
>>
>
> Mutexes aren't for cross process synchronisation (unlike a mutex in
> windows which can be shared across processes).
>
> Fred

OK. Then it means Mutex'es don't work in a multi-process Passenger
setup.

But then how can I synchronize this method's usage? I am very new to web
development so I just heard about database locking.

Simply, how should I use the
ActiveRecord::Transactions::ClassMethods#transaction and
ActiveRecord::Base#lock!?

Would it be OK to create a model and its corresponding table for just
locking? i.e. Lock model and locks table.

Then use them like this:

Lock.transaction do

lock = Lock.find(1)
lock.lock!

# do my stuff which should be done by only one process at a time.

end

Thanks,
Onur
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