simpleos 0.6.3

A Simple OS use for MCU, that implements single-threaded asynchronous runtime.
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#[macro_export]
macro_rules! singleton {
    ($type:ident { $($field:ident: $value:expr),* $(,)? }) => {
        impl $type {
            fn instance() -> &'static mut Option<$type> {
                static mut INSTANCE: Option<$type> = None;
                unsafe {
                    // if let None = INSTANCE {
                    if core::ptr::addr_of_mut!(INSTANCE).as_mut().unwrap_unchecked().as_mut().is_none() {
                        INSTANCE = Some($type {
                            $($field: $value,)*
                        });
                    }
                    core::ptr::addr_of_mut!(INSTANCE).as_mut().unwrap_unchecked()
                }
            }

            #[allow(unused)]
            pub fn get_mut() -> &'static mut Self {
                unsafe {
                    Self::instance().as_mut().unwrap_unchecked()
                }
            }

            #[allow(unused)]
            pub fn take() -> Option<$type> {
                Self::instance().take()
            }
        }
    };

    ($type:ident::$new_fn:ident()) => {
        impl $type {
            fn instance() -> &'static mut Option<$type> {
                static mut INSTANCE: Option<$type> = None;
                unsafe {
                    // if let None = INSTANCE {
                    if core::ptr::addr_of_mut!(INSTANCE).as_mut().unwrap_unchecked().as_mut().is_none() {
                        INSTANCE = Some($type::$new_fn());
                    }
                    core::ptr::addr_of_mut!(INSTANCE).as_mut().unwrap_unchecked()
                }
            }

            #[allow(unused)]
            pub fn get_mut() -> &'static mut Self {
                unsafe {
                    Self::instance().as_mut().unwrap_unchecked()
                }
            }

            #[allow(unused)]
            pub fn take() -> Option<$type> {
                Self::instance().take()
            }
        }
    };
}