Posted by C. (http://symcbean.blogspot.com/) on 01/08/08 16:09

On Jan 8, 9:03 am, Betikci Boris <pard...@gmail.com> wrote:
> On Jan 7, 10:36 am, Hanoi <hin...@inwind.it> wrote:
>
> > Hi,
>
> > I would like to have a php file that log informations sent by an image
> > request.
>
> > For logging, I use fwrite to write on a file.
>
> > If more requests are done on the same time, there could be a lost of
> > data because the file is open by one process and not available for the
> > other processes?
>
> > Thanks
>
> If you use OS as gnu/linux, cpu will handle each process sequently.

No it won't. At the level of PHP code they will effectively be running
concurrently, not sequentially. You can have multiple processes
writing to a file, but in the absence of a mutex there is no guarantee
that one write will not occurr in the middle of a seperate write -
large writes are not atomic.

C.

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