Question

use std::thread;
use std::sync::mpsc;
use std::process::exit;

struct Hello {
       text: String
}

 impl Hello {
          fn world(&self){
                   println!("{} World", &self.text);
                   exit();
             }
 }

  thread::spawn(||{
        let ex: Hello = Hello {
                text: "hello"
        }
        loop {
                  tx.tx();//what do i do here
      }
  })
  thread::spawn(|| {
           loop {
              rx.rx() //and here
           }
  })

如何通过发送方发送一些内容，从而在接收方的线程中执行world方法？

Answer 1

您要执行的是进程间通信。您首先要创建线程，但是要使用MPSC（多生产者，单消费者）渠道来使他们与其他人交谈，还有一些工作要做。

希望此示例激发您的hello::world()方法有帮助：

use std::process::exit;
use std::sync::mpsc;
use std::sync::mpsc::{Receiver, Sender};
use std::thread;

struct Hello {
    text: String,
}

impl Hello {
    fn world(&self) {
        println!("{} World", &self.text);
    }
}

static NTHREADS: usize = 3;

fn main() {
    let (tx, rx): (Sender<String>, Receiver<String>) = mpsc::channel();

    for id in 0..NTHREADS {
        // The sender endpoint can be copied
        let thread_tx = tx.clone();

        // Each thread will send its id via the channel
        thread::spawn(move || {
            // The thread takes ownership over `thread_tx`
            // Each thread queues a message in the channel
            let hello_text = format!("hello {}", id);
            thread_tx.send(hello_text).unwrap();

            // Sending is a non-blocking operation, the thread will continue
            // immediately after sending its message
            println!("thread {} finished", id);
        });
    }

    // Here, all the messages are received and hello instance is created with the
    // data received from the sender aka thread_tx.send command above.  From there
    // we call world() method
    for _ in 0..NTHREADS {
        // The `recv` method picks a message from the channel
        // `recv` will block the current thread if there no messages available
        let text = rx.recv().unwrap();
        let hello = Hello {
            text: text.to_string(),
        };
        hello.world();
    }
}

该代码已修改from this example。

如何通过发送方在另一个线程中调用方法？

1 个答案: