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Programming-Idioms

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  • Go

Idiom #25 Send a value to another thread

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

import "fmt"
go func() {
	v := <-ch
	fmt.Printf("Hello, %v\n", v)
}()

ch <- "Alan"

The receiver goroutine blocks reading the chan string named ch.
The current goroutine sends the value to ch.
A goroutine is like a lightweight green thread.
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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