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flock: incorporate user notes

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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@64282 c90b9560-bf6c-de11-be94-00142212c4b1
This commit is contained in:
jim winstead 2001-12-08 19:17:03 +00:00
parent 168667b201
commit 391611c803
1 changed files with 20 additions and 7 deletions
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27
functions/filesystem.xml
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@ -1,5 +1,5 @@
<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.94 $ -->
<!-- $Revision: 1.95 $ -->
<reference id="ref.filesystem">
<title>Filesystem functions</title>
<titleabbrev>Filesystem</titleabbrev>
@ -1152,7 +1152,7 @@ $fcontents = join ('', file ('http://www.php.net'));
<simpara>
<function>flock</function> allows you to perform a simple
reader/writer model which can be used on virtually every platform
(including most Unices and even Windows). The optional 3rd
(including most Unix derivatives and even Windows). The optional third
argument is set to &true; if the lock would block (EWOULDBLOCK
errno condition)
</simpara>
@ -1160,13 +1160,26 @@ $fcontents = join ('', file ('http://www.php.net'));
<function>flock</function> returns &true; on success and &false; on
error (e.g. when a lock could not be acquired).
</simpara>
<note>
<para>
Because <function>flock</function> requires a file pointer, you may have
to use a special lock file to protect access to a file that you intend
to truncate by opening it in write mode (with a "w" or "w+" argument to
<function>fopen</function>).
</para>
</note>
<warning>
<para>
On most operation systems <function>flock</function> is implemented
at the process level. When using a multithreaded server API like
ISAPI you cannot rely on <function>flock</function> to protect
files against other PHP scripts running in parallel threads of the
same server instance!
<function>flock</function> will not work on NFS and many other networked
file systems. Check your operating system documentation for more
details.
</para>
<para>
On some operating systems <function>flock</function> is implemented at
the process level. When using a multithreaded server API like ISAPI you
may not be able to rely on <function>flock</function> to protect files
against other PHP scripts running in parallel threads of the same server
instance!
</para>
</warning>
</refsect1>