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Cc: "Rob Richards" <rrichards@ctindustries.net>,
 "Rasmus Lerdorf" <rasmus@lerdorf.com>,
 "Matt Wilmas" <php_lists@realplain.com>,
 internals@lists.php.net
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Date: Fri, 13 Apr 2007 08:55:47 -0400
To: RQuadling@GoogleMail.com
Subject: Re: [PHP-DEV] Build failure
From: ilia@prohost.org (Ilia Alshanetsky)

The new implementation does not use any locks, instead it uses direct  
io, where locks are not necessary for append operations.


On 13-Apr-07, at 6:33 AM, Richard Quadling wrote:

> On 05/04/07, Rob Richards <rrichards@ctindustries.net> wrote:
>> No difference using sprintf()/fwrite() instead of fprintf().
>>
>> I did come across a similar issue from apache:
>> http://mail-archives.apache.org/mod_mbox/httpd-dev/199503.mbox/% 
>> 3C9502272049.aa02036@paris.ics.uci.edu%3E
>>
>> Changing to use VCWD_OPEN_MODE, write() and close() seems to work.
>>
>> Rob
>>
>
> Using PHP 5.2.2RC2-dev (cli) (built: Apr 13 2007 04:03:02) on  
> Windows with
>
> for %x in (A B C D E F G H I J K L M N O P Q R S T U V W X Y Z) do
> start php -r "ini_set('error_log','/tmp/test.log');for($i=0;$i<1000; 
> $i++)error_log(str_repeat('%x',5000));"`;
>
> And then doing some analysis of the log file I'm finding that not all
> the data has been written.
>
> Array
> (
>    [A] => 4965993
>    [B] => 4590918
>    [C] => 4525905
>    [D] => 4695939
>    [E] => 4495899
>    [F] => 4710942
>    [G] => 4495899
>    [H] => 4645929
>    [I] => 4540908
>    [J] => 4580916
>    [K] => 4535907
>    [L] => 4470894
>    [M] => 4480896
>    [N] => 4550910
>    [O] => 4610922
>    [P] => 4500900
>    [Q] => 4630926
>    [R] => 4480896
>    [S] => 4500900
>    [T] => 4535907
>    [U] => 4630926
>    [V] => 4470894
>    [W] => 4645929
>    [X] => 4825965
>    [Y] => 4845969
>    [Z] => 4920984
> )
> Lines (Should be 26 * 1000) : 23973
> Longest (Should be 5024) : 5024
> Shortest (Should be 5024) : 5024
>
> Out of the 26,000 lines expected we are missing 2027 lines.
>
> So no corruption of the lines, just missing ones.
>
> The only explanation I can think of is that the locking is working,
> but nothing is waiting for the lock to become available.
>
> Richard.
>
>
> -- 
> -----
> Richard Quadling
> Zend Certified Engineer : http://zend.com/zce.php? 
> c=ZEND002498&r=213474731
> "Standing on the shoulders of some very clever giants!"

Ilia Alshanetsky