From 0b49b056981f4c5bcbdbb7fada1a8379e0793c86 Mon Sep 17 00:00:00 2001
From: Botahamec <botahamec@outlook.com>
Date: Fri, 28 Oct 2022 22:20:05 -0400
Subject: Implemented SpinLock

---
 src/mutex.rs | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

(limited to 'src/mutex.rs')

diff --git a/src/mutex.rs b/src/mutex.rs
index a152eda..6c2e254 100644
--- a/src/mutex.rs
+++ b/src/mutex.rs
@@ -1,6 +1,7 @@
 use std::cell::UnsafeCell;
 use std::ops::{Deref, DerefMut};
 
+use crate::lock::Lock;
 use crate::ThreadKey;
 
 /// Implements a raw C-like mutex.
@@ -31,6 +32,38 @@ pub unsafe trait RawMutex {
 	unsafe fn unlock(&self);
 }
 
+/// A raw mutex which just spins
+pub struct RawSpin {
+	lock: Lock,
+}
+
+unsafe impl RawMutex for RawSpin {
+	const INIT: Self = Self { lock: Lock::new() };
+
+	fn lock(&self) {
+		loop {
+			std::hint::spin_loop();
+
+			if let Some(key) = self.lock.try_lock() {
+				std::mem::forget(key);
+				return;
+			}
+		}
+	}
+
+	fn try_lock(&self) -> bool {
+		self.lock.try_lock().is_some()
+	}
+
+	fn is_locked(&self) -> bool {
+		self.lock.is_locked()
+	}
+
+	unsafe fn unlock(&self) {
+		self.lock.force_unlock();
+	}
+}
+
 /// A mutual exclusion primitive useful for protecting shared data, which
 /// cannot deadlock.
 ///
-- 
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