esp32-nimble 0.12.0

A wrapper for the ESP32 NimBLE Bluetooth stack.
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// original: https://github.com/esp-rs/esp-idf-svc/blob/master/src/private/mutex.rs

use core::cell::UnsafeCell;
use core::ops::{Deref, DerefMut};
use esp_idf_svc::sys::*;

// NOTE: ESP-IDF-specific
const PTHREAD_MUTEX_INITIALIZER: u32 = 0xFFFFFFFF;

pub struct RawMutex(UnsafeCell<pthread_mutex_t>);

impl RawMutex {
    #[inline(always)]
    pub const fn new() -> Self {
        Self(UnsafeCell::new(PTHREAD_MUTEX_INITIALIZER as _))
    }

    #[inline(always)]
    #[allow(clippy::missing_safety_doc)]
    pub unsafe fn lock(&self) {
        let r = unsafe { pthread_mutex_lock(self.0.get()) };
        debug_assert_eq!(r, 0);
    }

    #[inline(always)]
    #[allow(clippy::missing_safety_doc)]
    pub unsafe fn try_lock(&self) -> bool {
        unsafe { pthread_mutex_trylock(self.0.get()) == 0 }
    }

    #[inline(always)]
    #[allow(clippy::missing_safety_doc)]
    pub unsafe fn unlock(&self) {
        let r = unsafe { pthread_mutex_unlock(self.0.get()) };
        debug_assert_eq!(r, 0);
    }
}

impl Drop for RawMutex {
    fn drop(&mut self) {
        let r = unsafe { pthread_mutex_destroy(self.0.get_mut() as *mut _) };
        debug_assert_eq!(r, 0);
    }
}

unsafe impl Sync for RawMutex {}
unsafe impl Send for RawMutex {}

pub struct Mutex<T>(RawMutex, UnsafeCell<T>);

#[allow(dead_code)]
impl<T> Mutex<T> {
    #[inline(always)]
    pub const fn new(data: T) -> Self {
        Self(RawMutex::new(), UnsafeCell::new(data))
    }

    #[inline(always)]
    pub fn lock(&self) -> MutexGuard<'_, T> {
        MutexGuard::new(self)
    }

    #[inline(always)]
    pub fn try_lock(&self) -> Option<MutexGuard<'_, T>> {
        MutexGuard::try_new(self)
    }

    #[inline(always)]
    pub(crate) fn into_innter(self) -> T {
        self.1.into_inner()
    }

    #[inline]
    pub(crate) unsafe fn raw(&self) -> &'_ T {
        unsafe { self.1.get().as_mut().unwrap() }
    }
}

unsafe impl<T> Sync for Mutex<T> where T: Send {}
unsafe impl<T> Send for Mutex<T> where T: Send {}

pub struct MutexGuard<'a, T>(&'a Mutex<T>);

impl<'a, T> MutexGuard<'a, T> {
    #[inline(always)]
    fn new(mutex: &'a Mutex<T>) -> Self {
        unsafe {
            mutex.0.lock();
        }

        Self(mutex)
    }

    #[inline(always)]
    fn try_new(mutex: &'a Mutex<T>) -> Option<Self> {
        if unsafe { mutex.0.try_lock() } {
            Some(Self(mutex))
        } else {
            None
        }
    }
}

impl<T> Drop for MutexGuard<'_, T> {
    #[inline(always)]
    fn drop(&mut self) {
        unsafe {
            self.0.0.unlock();
        }
    }
}

impl<T> Deref for MutexGuard<'_, T> {
    type Target = T;

    #[inline(always)]
    fn deref(&self) -> &Self::Target {
        unsafe { self.0.1.get().as_mut().unwrap() }
    }
}

impl<T> DerefMut for MutexGuard<'_, T> {
    #[inline(always)]
    fn deref_mut(&mut self) -> &mut Self::Target {
        unsafe { self.0.1.get().as_mut().unwrap() }
    }
}