user
The goal of this task is to create two concurrent activities ("Threads" or "Tasks", not processes.) that share data synchronously. Your language may provide syntax or libraries to perform concurrency. Different languages provide different implementations of concurrency, often with different names. Some languages use the term threads, others use the term tasks, while others use co-processes. This task should not be implemented using fork, spawn, or the Linux/UNIX/Win32 pipe command, as communication should be between threads, not processes.

One of the concurrent units will read from a file named "input.txt" and send the contents of that file, one line at a time, to the other concurrent unit, which will print the line it receives to standard output. The printing unit must count the number of lines it prints. After the concurrent unit reading the file sends its last line to the printing unit, the reading unit will request the number of lines printed by the printing unit. The reading unit will then print the number of lines printed by the printing unit.

This task requires two-way communication between the concurrent units. All concurrent units must cleanly terminate at the end of the program.
assistant
(formerly Perl 6)

**Works with**: rakudo version 2013-02-27

```
sub MAIN ($infile) {
    $infile.IO.lines ==> printer() ==> my $count;
    say "printed $count lines";
}

sub printer(*@lines) {
    my $lines;
    for @lines {
	.say;
	++$lines;
    }
    $lines;
}

```

Concurrent units are established by use of the feed operator, which works much like an in-process object pipe. Since the final feed goes to a variable declaration that belongs to the outer thread, it serves as a backchannel from the printer thread. In this case the outer thread signals the desire for a line count by terminating the pipe to the printing thread.
(Note: soon these will be implemented with real threads in Raku, but this is currently emulated with coroutine semantics, aka lazy lists.)