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https://issues.apache.org/jira/browse/LOG4PHP-196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13474433#comment-13474433
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Steve Howe commented on LOG4PHP-196:
------------------------------------
Hey Ivan. I'm not sure if Kyle tested this bug in the latest code, however I
don't think flock() will solve the issue when *multiple* PHP processes are
trying to read/write/roll the log file on Windows. (Think multiple Windows CLI
php-win.exe processes running and trying to roll the same log file at the
near/same time.)
The PHP documentation on flock() is a bit cryptic, but the 2nd "Warning" doc
block in the Notes section mentions the limitations of flock() on Windows here:
http://php.net/manual/en/function.flock.php
Some other posts relating to the limitation of flock() on Windows:
* http://bytes.com/topic/php/answers/487428-php-instances-writing-same-file
*
http://cubicspot.blogspot.com/2010/10/forget-flock-and-system-v-semaphores.html
Thanks for your help with this, Ivan! Hopefully it will help someone else too.
> Appender Rolling File: Seperate PHP processes attempting to roll the same log
> file will truncate the log.
> ---------------------------------------------------------------------------------------------------------
>
> Key: LOG4PHP-196
> URL: https://issues.apache.org/jira/browse/LOG4PHP-196
> Project: Log4php
> Issue Type: Bug
> Components: Code
> Affects Versions: 2.2.1
> Environment: Windows
> Reporter: Kyle Wiering
> Labels: bug, fix, patch
> Fix For: 2.3.0
>
> Attachments: config_roll_windows.xml, fileroller.php, filewriter.php,
> LoggerAppenderRollingFileWindows.php,
> LoggerAppenderRollingFileWindowsTest.php, LoggerAutoloader.php
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> Attaching a class extension to LoggerAppenderRollingFile named
> LoggerAppenderRollingFileWindows. This class enacts 'blocking' to keep
> seperate PHP processes from truncating the log file by attempting to roll the
> logs at/near the same exact time. It also uses a 'rename' in a manner that
> is much quicker then a copy for large files.
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