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Programming-Idioms

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  • Rust

Idiom #25 Send a value to another thread

Share the string value "Alan" with an existing running process which will then display "Hello, Alan"

use std::thread;
use std::sync::mpsc::channel;
let (send, recv) = channel();

thread::spawn(move || {
    loop {
        let msg = recv.recv().unwrap();
        println!("Hello, {:?}", msg);
    }  
});

send.send("Alan").unwrap();

The message might not be printed if the main thread exits before the thread has written to stdout.
declare

   task Greeter is
      entry Greet (Name : String);
   end Greeter;

   task body Greeter is
   begin

      accept Greet (Name : String) do
         Ada.Text_IO.Put_Line ("Hello, " & Name);
      end Greet;

   end Greeter;

begin
   Greeter.Greet ("Alan");
end;

This is called a rendez-vous in Ada. The caller is blocked until the Greet accept statement is completed.

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