Do file locks stay when you use open for a second time?

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Suppose:

my $fh;
open $fh, ">>", "file.txt";
flock($fh, LOCK_EX);
open $fh, "+<", "file.txt";
close $fh;

Will the file lock stay or will it be released? If it will be released is there a way to make it stay ? I cloud not find relevant information.

asked 45 secs ago

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Do file locks stay when you use open for a second time?