rt 0.19.1

A real-time operating system capable of full preemption
Documentation 
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use crate::bindings::{RT_STACK_FP_MIN, RT_STACK_MIN};
#[cfg(not(feature = "task-mpu"))]
use crate::cell::SyncUnsafeCell;
#[cfg(feature = "task-mpu")]
pub use crate::mpu::Stack;

pub const MIN: usize = RT_STACK_MIN as usize;
pub const FP_MIN: usize = RT_STACK_FP_MIN as usize;

#[cfg(all(target_arch = "arm", target_os = "none", not(feature = "task-mpu")))]
#[repr(align(8))]
pub struct Stack<const N: usize> {
    pub buf: SyncUnsafeCell<[u8; N]>,
}

#[cfg(all(target_arch = "riscv32", target_os = "none", not(feature = "task-mpu")))]
#[repr(align(16))]
pub struct Stack<const N: usize> {
    pub buf: SyncUnsafeCell<[u8; N]>,
}

#[cfg(all(target_arch = "aarch64", target_os = "none"))]
#[repr(align(16))]
pub struct Stack<const N: usize> {
    pub buf: SyncUnsafeCell<[u8; N]>,
}

#[cfg(any(target_os = "linux", target_os = "macos"))]
pub struct Stack<const N: usize> {
    // On Linux and macOS, the stack is created with mmap, so don't allocate space for one here.
    pub buf: SyncUnsafeCell<[u8; 0]>,
}

#[cfg(not(feature = "task-mpu"))]
impl<const N: usize> Stack<N> {
    pub const fn new() -> Stack<N> {
        #[cfg(target_os = "none")]
        {
            Stack {
                buf: SyncUnsafeCell::new([0u8; N]),
            }
        }
        #[cfg(any(target_os = "linux", target_os = "macos"))]
        {
            Stack {
                buf: SyncUnsafeCell::new([]),
            }
        }
    }
}

#[cfg(not(feature = "task-mpu"))]
impl<const N: usize> Default for Stack<N> {
    fn default() -> Self {
        Self::new()
    }
}