rustHow can I use a mutex as a global variable in Rust?

A mutex can be used as a global variable in Rust by creating a static mutex and then using the lazy_static crate to initialize it.

use lazy_static::lazy_static;
use std::sync::Mutex;

lazy_static! {
    static ref MUTEX: Mutex<u32> = Mutex::new(0);
}

The code above creates a static mutex called MUTEX and initializes it with the value 0.

Code explanation

1. use lazy_static::lazy_static; - imports the lazy_static crate which provides the lazy_static! macro.
2. use std::sync::Mutex; - imports the Mutex type from the std::sync module.
3. lazy_static! { - starts the lazy_static! macro which is used to create a static mutex.
4. static ref MUTEX: Mutex<u32> = Mutex::new(0); - creates a static mutex called MUTEX and initializes it with the value 0.
5. } - ends the lazy_static! macro.

Helpful links

• lazy_static
• Mutex

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