Yes, use flock. And strict, warnings and 3-argument open. Some sample locking code follows. Adjust according to your needs.
use strict;
use warnings;
use Fcntl ':flock'; # import LOCK_* constants
open(my $fhlock, '>', $somelockfile) or die "Error: open '$somelockfil
+e': $!";
# Note: process will block at this point until the lock is acquired.
flock($fhlock, LOCK_EX) or die "Error: flock '$somelockfile': $!";
# Lock is now held until $fhlock is closed.
# Note that even if this program crashes or is killed, $fhlock will
# be closed by the OS and the lock released.
# ...
# Release the lock simply by closing the file handle.
close $fhlock or die "Error: close '$somelockfile': $!";
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|