PHP Classes

File: v2/tests/test2.php

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  Classes of Nicola Covolo   Safe IO   v2/tests/test2.php   Download  
File: v2/tests/test2.php
Role: Example script
Content type: text/plain
Description: Example script
Class: Safe IO
Access files using locks to prevent corruption
Author: By
Last change: Update of v2/tests/test2.php
Date: 6 months ago
Size: 898 bytes
 

Contents

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<?php
$time
= time();
require(
'../ConcurrentFile.php');
 
   if (
$_POST) {
 
// do stuff
   
$file = new ConcurrentFile("data.txt");
   
$file->writeLock();
   
sleep(20);
   
$file->write("hello world old");
   
$file->close();
   
  }
    
?>
<html>
<head><title>race condition example</title></head>
<body>
  <p>This is a test to see the transaction at work.</p>
  <p>click on the button "do stuff", while page is loading remove the code "sleep(20)" and change "old" to "right", then click in a new tab the same button </p>
  <p>You will see that the second script will wait for the end of first script and the result is right</p>
  <form method="POST">
    Delay caused by lock <?php echo time() - $time; ?> , max is 20.<br>
    <a><?php echo ConcurrentFile::getInstance("data.txt")->read(); ?></a>
   
    <input type="submit" name="do_stuff" value="Do stuff!">
  </form>
</body>
</html>