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I'm currently putting the finishing touches to a site. However some of the scripts access a file (and write to it every once in a while) and when a few users are on at the same time there seems to be a clash as they try to access and write at the same time. I tried to fix this by writing a WaitForFile function that would wait until it could read the file and then Flock it and only return when it had succeeded. However there still seems to be the problem. Any ideas?
The file permissions are fine, it writes and reads successfully most of the time.
It's basically a log file. I probably could do it using a database but I would really prefer not to. I was just wondering if there was any normal way of opening a file so that one user can use it at a time and waits for the file to be freed up. The function I wrote to get a handle of a file for writing is as such:
function waitforfilehandle_write($path)
{
//echo "$path
\n";
$RetVal = -1;
if (file_exists($path))
{
$success = 0;
while ($success==0)
{
if (is_writable($path))
{
$handle = @fopen($path, 'w');
if ($handle && flock($handle,LOCK_EX))
{
$RetVal = $handle;
$success = 1;
}
else
{
fclose($handle);
}
}
}
}
else
{
echo "ERROR 908 - WaitForFileHandle_Write has no file";
}
return $RetVal;
}
It's basically a log file. I probably could do it using a database but I would really prefer not to. I was just wondering if there was any normal way of opening a file so that one user can use it at a time and waits for the file to be freed up. The function I wrote to get a handle of a file for writing is as such:
function waitforfilehandle_write($path)
{
//echo "$path
\n";
$RetVal = -1;
if (file_exists($path))
{
$success = 0;
while ($success==0)
{
if (is_writable($path))
{
$handle = @fopen($path, 'w');
if ($handle && flock($handle,LOCK_EX))
{
$RetVal = $handle;
$success = 1;
}
else
{
fclose($handle);
}
}
}
}
else
{
echo "ERROR 908 - WaitForFileHandle_Write has no file";
}
return $RetVal;
}
Sounds like a permissions issue. Look up CHMOD 0777 - change mode. 0777 Has all permissions open for writing. You can also right-click the file and tick the boxes to set the mode of the file, if it allows.
Hmmm.
When you say "write to a file", what exactly is being written?
You could probably do with a database instead...
When you say "write to a file", what exactly is being written?
You could probably do with a database instead...
I'm currently putting the finishing touches to a site. However some of the scripts access a file (and write to it every once in a while) and when a few users are on at the same time there seems to be a clash as they try to access and write at the same time. I tried to fix this by writing a WaitForFile function that would wait until it could read the file and then Flock it and only return when it had succeeded. However there still seems to be the problem. Any ideas?