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Programming-Idioms

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  • Python

Idiom #25 Send a value to another thread

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

from queue import Queue
from threading import Thread
q = Queue()

def worker():
    while True:
        print(f"Hello, {q.get()}")
        q.task_done()

Thread(target=worker, daemon=True).start()

q.put("Alan")
q.join()
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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