From fe67aa262f1b04fb6c38683d9221c3a2fafcc35a Mon Sep 17 00:00:00 2001
From: Mica White <botahamec@outlook.com>
Date: Sun, 10 Mar 2024 20:21:00 -0400
Subject: Reorganization

---
 src/rwlock/read_guard.rs | 52 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 src/rwlock/read_guard.rs

(limited to 'src/rwlock/read_guard.rs')

diff --git a/src/rwlock/read_guard.rs b/src/rwlock/read_guard.rs
new file mode 100644
index 0000000..e967420
--- /dev/null
+++ b/src/rwlock/read_guard.rs
@@ -0,0 +1,52 @@
+use std::marker::PhantomData;
+use std::ops::Deref;
+
+use lock_api::RawRwLock;
+
+use crate::key::Keyable;
+
+use super::{RwLock, RwLockReadGuard, RwLockReadRef};
+
+impl<'a, T: ?Sized + 'a, R: RawRwLock> Deref for RwLockReadRef<'a, T, R> {
+	type Target = T;
+
+	fn deref(&self) -> &Self::Target {
+		// safety: this is the only type that can use `value`, and there's
+		//         a reference to this type, so there cannot be any mutable
+		//         references to this value.
+		unsafe { &*self.0.value.get() }
+	}
+}
+
+impl<'a, T: ?Sized + 'a, R: RawRwLock> Drop for RwLockReadRef<'a, T, R> {
+	fn drop(&mut self) {
+		// safety: this guard is being destroyed, so the data cannot be
+		//         accessed without locking again
+		unsafe { self.0.force_unlock_read() }
+	}
+}
+
+impl<'a, 'key: 'a, T: ?Sized + 'a, Key: Keyable, R: RawRwLock> Deref
+	for RwLockReadGuard<'a, 'key, T, Key, R>
+{
+	type Target = T;
+
+	fn deref(&self) -> &Self::Target {
+		&self.rwlock
+	}
+}
+
+impl<'a, 'key: 'a, T: ?Sized + 'a, Key: Keyable, R: RawRwLock>
+	RwLockReadGuard<'a, 'key, T, Key, R>
+{
+	/// Create a guard to the given mutex. Undefined if multiple guards to the
+	/// same mutex exist at once.
+	#[must_use]
+	pub(super) const unsafe fn new(rwlock: &'a RwLock<T, R>, thread_key: Key) -> Self {
+		Self {
+			rwlock: RwLockReadRef(rwlock),
+			thread_key,
+			_phantom: PhantomData,
+		}
+	}
+}
-- 
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