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Core Problem

The issue is related to a deadlock in the Tokio runtime, which causes the program to hang indefinitely.

Solution & Analysis

To fix this issue, we need to ensure that the tokio::runtime::Builder is properly configured and initialized before running the application. The code should be updated as follows:

use tokio::runtime::Builder;

fn main() {
    // Create a new runtime builder
    let mut builder = Builder::new_multi_thread()
        .worker_threads(1) // Only one worker thread for demonstration purposes

    // Build and run the runtime with our application
    let rt = builder.build().unwrap();
    rt.block_on(async {
        // Run your code here
        println!("Hello, world!");
    });
}

In this updated code, we create a new Builder instance and configure it to use only one worker thread for demonstration purposes. This should help prevent the deadlock issue.

Conclusion

By properly configuring and initializing the Tokio runtime, we can resolve the deadlock issue and ensure that our application runs smoothly.

Reference