Macro lilos::create_static_mutex

macro_rules! create_static_mutex {
    ($t:ty, $contents:expr) => { ... };
}

Convenience macro for creating a pinned mutex in static memory.

This declares a local variable ident of type Pin<&mut Mutex<T>>, but which points to a Mutex<T> in static memory. This helps to keep your application’s memory usage transparent at build time, but it’s slightly trickier to use than create_mutex, because it will only succeed once in the life of your program: you cannot use a function containing create_static_mutex from several tasks to create several mutexes, because they would alias. If you need that, use create_mutex.

Unlike create_mutex, create_static_mutex returns its Pin<&mut Mutex<T>> and can just be assigned to a variable. However, it does require that you tell it the type explicitly:

let my_mutex = create_static_mutex!(usize, 42);
// ...
*my_mutex.lock().await += 4;