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[Sync-En] Document potential Windows deadlock in flock() #1093

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julionc merged 1 commit into from
Aug 26, 2026
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[Sync-En] Document potential Windows deadlock in flock() #1093

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24 changes: 22 additions & 2 deletions reference/filesystem/functions/flock.xml
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Original file line number Diff line number Diff line change
@@ -1,6 +1,5 @@
<?xml version="1.0" encoding="utf-8"?>
<!-- EN-Revision: 75a76afb61d91f04feebc83931c5412b13682d2b Maintainer: PhilDaiguille Status: ready -->
<!-- Reviewed: no -->
<!-- EN-Revision: f3112c43e303fcd63c0df89798b45bfef9d49e15 Maintainer: PhilDaiguille Status: ready -->
<refentry xml:id="function.flock" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>flock</refname>
Expand Down Expand Up @@ -191,12 +190,33 @@ fclose($fp);
anticuados como <literal>FAT</literal> y sus derivados, y por lo tanto
siempre devolverá &false; en estos entornos.
</para>
<para>
En Windows, si PHP intenta ejecutar un fichero de código fuente PHP bloqueado con
<constant>LOCK_EX</constant>, el proceso quedará suspendido hasta que el fichero
sea desbloqueado. El siguiente ejemplo provocará un bloqueo mutuo (deadlock):
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
if ($argv[1] ?? null === 'child') { die(); }
$fp = fopen(__FILE__, "rb");
flock($fp, LOCK_EX);
shell_exec("php " . escapeshellarg(__FILE__) . " child");
?>
]]>
</programlisting>
</informalexample>
</para>
</warning>
<note>
<para>
En Windows, si el proceso de bloqueo abre el fichero una segunda vez, no podrá
acceder al fichero a través de este segundo manejador hasta que desbloquee el fichero.
</para>
<simpara>
En Windows, si se intenta incluir con require un fichero bloqueado con LOCK_EX,
fallará con ErrorException: require(): Read of X bytes failed with errno=13 Permission denied
</simpara>
</note>
</refsect1>

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