Seems to me a thread can exit in one of three ways.

• By throwing an exception.

  $ perl -Mthreads -e'my $t = async { die "Foo" }; $t->join; say "done"'
  Thread 1 terminated abnormally: Foo at -e line 1.
  done
  [download]

  This isn't silent.

• By returning.

  $ perl -Mthreads -E'my $t = async { "code" }; $t->join; say "done"'
  done
  [download]

  You can detect this as follows:

  $ perl -Mthreads -E'sub t { "code" } my $t = async { t(); warn("return
  +ed"); }; $t->join; say "done"'
  returned at -e line 1.
  done
  [download]

• By calling threads->exit

  $ perl -Mthreads -E'sub t { "code" } my $t = async { threads->exit(); 
  +}; $t->join; say "done"'
  done
  [download]

  You can detect this as follows:

  $ perl -Mthreads -E'my $o = \&threads::exit; *threads::exit = sub { wa
  +rn "exit"; $o->(@_) }; my $t = async { threads->exit(); }; $t->join; 
  +say "done"'
  exit at -e line 1.
  done
  [download]

Another possibility is that your thread isn't responding because it's blocked, not because it exited. What makes you think it died?

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