Re: [MacPerl] MacPerl & Databases

[Matt Henderson <matt@exponet.net>]

On 1/3/99 1:35 PM, Bart Lateur (bart.lateur@skynet.be) wrote:

>>flock() does not work with MacPerl.  One method that can work is with a
>>separate lock file: create a file called "file.lock" and have your other
>>programs fail while "file.lock" exists.  That approach is flawed in some
>>ways (if your program dies, then everything is locked out until you fix it
>>manually or something), but it is an alternative.

>Then try opening the file for output.
...
>I'm not sure what good it is. After all, you can only run one MacPerl
>script at a time. Or do you plan to simultaniously open this file using
>another program as well?

I'm developing the script on a Mac running QuidProQuo and MacPerl. 
However, the ultimate destination is a website on a Unix machine. I'd 
like to find a locking scheme which is portable between the two OS's. 

I like Chris's idea of writing a temporary file to indicate that the 
database is busy, even if it suffers the problem of having to manually 
delete the temp file when something goes wrong. I was thinking about 
having the script email me when there's a contention problem. So if I 
suddenly get loads of these emails, I'll know that script crashed, and I 
need to go delete the temp file.

Regards,

Matt Henderson   |   matt@exponet.net   |    www.exponet.net
                 .                      .    
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