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File Access + Thread Safe
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| Yitzle 2007-04-22, 3:58 am |
| I got a CGI script that is being used by multiple users.
It reads/writes data to a database (text file).
When it reads, it reads the entire file, and when it writes, it
tuncrates and rewrites the entire file.
Can/will this screw up the file if two people try to write to the file
at the same time?
How do I prevent problems? (SQL/MySQL is not an option)
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| On Sun, April 22, 2007 12:52 am, yitzle wrote:
> I got a CGI script that is being used by multiple users.
> It reads/writes data to a database (text file).
> When it reads, it reads the entire file, and when it writes, it
> tuncrates and rewrites the entire file.
> Can/will this screw up the file if two people try to write to the file
> at the same time?
> How do I prevent problems? (SQL/MySQL is not an option)
I don't think it would because the first person to open the file has the
editing rights. Another person that would open the file after the first
one would think they are editing but it would not save.
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| John W. Krahn 2007-04-22, 3:58 am |
| yitzle wrote:
> I got a CGI script that is being used by multiple users.
> It reads/writes data to a database (text file).
> When it reads, it reads the entire file, and when it writes, it
> tuncrates and rewrites the entire file.
> Can/will this screw up the file if two people try to write to the file
> at the same time?
> How do I prevent problems? (SQL/MySQL is not an option)
perldoc -q "\block"
John
--
Perl isn't a toolbox, but a small machine shop where you can special-order
certain sorts of tools at low cost and in short order. -- Larry Wall
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