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Posted by David T. Ashley on 06/23/07 19:42
"howa" <howachen@gmail.com> wrote in message
news:1182614984.507891.134810@i38g2000prf.googlegroups.com...
> On 6 23 , 11 35 , "David T. Ashley" <d...@e3ft.com> wrote:
>> The particular approach I use to ensure uniqueness is to concatenate
>> time,
>> microtime, and PID, and then to spinlock until the microtime changes.
>> This
>> works because no two processes can have the same PID at the same time.
>
> yes, your method seem more reliable than PHP implementation...
> but will it work on multi-thread web server, e.g. apache2?
My understanding would be that it won't work if a server is truly
multi-threaded.
My assumption is that each process is single-threaded, and that the http
server farms things out so that each PHP script running at any instant in
time has only one PID.
If threads are involved, that complicates things.
One would then need to use a different method entirely or also add some kind
of a thread identifier.
Dave.
--
David T. Ashley (dta@e3ft.com)
http://www.e3ft.com (Consulting Home Page)
http://www.dtashley.com (Personal Home Page)
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