php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login
Bug #54129 using LOCK_NB whilst aquiring a lock with flock() does work on windows
Submitted: 2011-03-01 16:59 UTC Modified: -
Votes:5
Avg. Score:3.0 ± 1.7
Reproduced:3 of 3 (100.0%)
Same Version:2 (66.7%)
Same OS:2 (66.7%)
From: scope at planetavent dot de Assigned:
Status: Open Package: Documentation problem
PHP Version: 5.3.5 OS: Windows Server 2008 (x64)
Private report: No CVE-ID:
Have you experienced this issue?
Rate the importance of this bug to you:

 [2011-03-01 16:59 UTC] scope at planetavent dot de
Description:
------------
The online documentation states that LOCK_NB to achieve a non-blocking lock-attempt is not supported on windows.

The given test script, if started twice, just returns stating that the lock can not be aquired. Therefor, since it does not block, using LOCK_NB seems to work on windows and the documentation should be updated accordingly. If this is not the expected behaviour, the documentation should reflect the possible situations, where using LOCK_NB does indeed not work.

Furthermore the statement "The automatic unlocking when the file's resource handle is closed was removed. Unlocking now always has to be done manually." should be checked. My test show that closing the file pointer with fclose() does release the lock.

Test script:
---------------
<?php

$lockfile = 'dummy.lock';

$fp = fopen( $lockfile, 'w+' );

if ( !$fp )
{
	  echo "unable to open lockfile\n";
	  exit;
 }

if ( !flock( $fp, LOCK_EX | LOCK_NB ) )
{
	echo "unable to aquire lock\n";
	exit;
}

sleep( 10 );


Expected result:
----------------
According to documentation, script should block (since LOCK_NB is not supported)

Actual result:
--------------
flock does not block

Patches

Add a Patch

Pull Requests

Add a Pull Request

 
PHP Copyright © 2001-2014 The PHP Group
All rights reserved.
Last updated: Mon Apr 21 10:02:10 2014 UTC