I'm writing a module that using flock() as part of its filehandling. (I'm on Solaris, if it makes any difference.) Like a good Perlmonkey, I'm writing a test, seeing it fail, writing some code, seeing it pass. Except, I'm running into a problem. (Assume the variables are all declared and set appropriately.) 
001_sometest.t
--------------
use_ok( $CLASS );

my $obj = $CLASS->new(
    filename => $logfile,
);
isa_ok( $obj, $CLASS );

ok( -e $logfile, "$CLASS created logfile" );

open my $fh, '>>', $logfile
    or die "Cannot open '$logfile' for appending: $!\n";
my $rc = flock( $fh, LOCK_EX | LOCK_NB );
ok( !$rc, "Cannot flock $logfile" );

[download]

The point is that new() will open $filename for appending, then flock it with LOCK_EX. All this is happening successfully. Except, I don't seem to be able to test that I got the flock correctly. Is this because I'm trying to test a process-level lock within the same process? How would you test it? I don't want to whip out Proc::Background . . .

The Perfect is the Enemy of the Good.

In reply to Testing if your code successfully flocked by dragonchild

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