How do you test code that uses locking (flock)?

Testing code that uses locking (flock) can be challenging. It's essential to ensure that your locks work as expected and that your code handles concurrent access correctly. Below is an example illustrating how you might go about testing code that utilizes the flock function in Perl.


        #!/usr/bin/perl
        use strict;
        use warnings;
        
        my $filename = 'test.txt';
        
        open(my $fh, '>>', $filename) or die "Could not open file: $!";
        
        # Lock the file for exclusive writing
        flock($fh, 2) or die "Could not lock file: $!";
        
        # Simulate writing to the file
        print $fh "Writing some data...\n";
        
        # Unlock the file
        flock($fh, 8) or die "Could not unlock file: $!";
        
        close($fh);

How do you test code that uses locking (flock)?

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How do you test code that uses locking (flock)?

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