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#![no_std]
use core::cell::UnsafeCell;
pub struct Mutex {
locked: UnsafeCell<bool>,
}
unsafe impl Send for Mutex {}
unsafe impl Sync for Mutex {}
impl Mutex {
pub const fn new() -> Mutex {
Mutex { locked: UnsafeCell::new(false) }
}
#[inline]
pub unsafe fn init(&mut self) {}
#[inline]
pub unsafe fn lock(&self) {
let locked = self.locked.get();
assert!(!*locked, "cannot recursively acquire mutex");
*locked = true;
}
#[inline]
pub unsafe fn unlock(&self) {
*self.locked.get() = false;
}
#[inline]
pub unsafe fn try_lock(&self) -> bool {
let locked = self.locked.get();
if *locked {
false
} else {
*locked = true;
true
}
}
#[inline]
pub unsafe fn destroy(&self) {}
}
pub struct ReentrantMutex {}
impl ReentrantMutex {
pub const unsafe fn uninitialized() -> ReentrantMutex {
ReentrantMutex {}
}
pub unsafe fn init(&self) {}
pub unsafe fn lock(&self) {}
#[inline]
pub unsafe fn try_lock(&self) -> bool {
true
}
pub unsafe fn unlock(&self) {}
pub unsafe fn destroy(&self) {}
}