try only locking the file on a write, *not* on a read.
you are going to have many times more reads than writes,
even on the busiest day....
what you need to have is a blocking-lock your writes
and not bother with locks for reading.
the way you have it setup now, there's no locking
for writes, so you could definately have two instances
of PHP trying to write to the same file simultaneously
and corrupt your data.
besides, if you lock only for writing, and not for
reading, you can read the file while it's being written -
but you can never write twice.
> -----Original Message-----
> From: Rui Barreiros [mailto:[EMAIL PROTECTED]]
> Subject: [PHP] writing while reading
> hi all,
>
> i'm writing a web chat, the frame that presents the text, has a very fast
> refresh (has to) it's about from 2 in 2 seconds, my problem is writing to the
> file (chat is file based), when the refresh read the file, it doesn't let php
> write. i made comething like this.
>
> Function chat2file($filename, $str) {
> $fp = fopen("chats/$filename", "a");
> fputs($fp, $str);
> close($fp);
> }
>
> Function file2chat($filename) {
> if(file_exists("chats/$filename")) {
> $fd = fopen("chats/$filename", "r");
> flock($fd, LOCK_UN);
> $content = fread($fd, filesize("chats/$filename"));
> fclose($fd);
> return $content;
> } else {
> return "";
> }
> }
>
> i put the non blocking option in flock while reading but still blocks and
> doesn't write, my question is it possible to write to a file while reading?!,
> if so how?
>
> thx.
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