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php3-list | 199903

Re: [PHP3] .htpasswd From: Sascha Schumann (sas <email protected>)
Date: 03/06/99

On Fri, Mar 05, 1999 at 02:31:29PM +1000, Cameron Just wrote:
> Heres some code we just wrote which adds users to a htpasswd file.
>
> 1. Creates a temp file called $htpasswdfile.".lock"
> 2. If this file exists then it waits until doesn't(This stops the
> occurrence of two people adding at once)

And creates a race, until you find a way to do the check and the creation of
the .lock file atomatically.

> The Lock file never gets written to it's just there to let other processes
> know that the htpasswd file is currently being modified.
> This could be done using semaphores but we didn't want to re-learn them
> just yet :)

Using semaphores is a much better way, because it happens to be an atomic
operation.

$semid = sem_get($semaphore_key);
sem_acquire($semid);
...actions...
sem_release($semid); 

-- 

          Regards,

                            Sascha Schumann | 
                                 Consultant | finger sas <email protected>
                                            | for PGP public key

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