vecs: init

crates/brk_vecs/src/file/region.rs

@@ -0,0 +1,79 @@
+// use std::sync::Arc;
+
+use bincode::{Decode, Encode};
+// use parking_lot::{RwLock, RwLockReadGuard};
+
+use crate::PAGE_SIZE;
+
+// #[derive(Debug, Encode, Decode)]
+#[derive(Debug, Encode, Decode)]
+pub struct Region {
+    // Bad name
+    /// Must be multiple of 4096
+    start: usize,
+    length: usize,
+    /// Must be multiple of 4096
+    reserved: usize,
+    // lock: Arc<RwLock<()>>,
+    // variant: usize, // Raw or Compressed or something else ? to know if there is a header ? Since blocks 4096, storing headers individually would be dumb
+}
+
+impl Region {
+    pub fn new(start: usize, length: usize, reserved: usize) -> Self {
+        assert!(reserved > 0);
+        assert!(start % PAGE_SIZE == 0);
+        assert!(reserved % PAGE_SIZE == 0);
+        assert!(length <= reserved);
+
+        Self {
+            start,
+            length,
+            reserved,
+            // lock: Arc::new(RwLock::new(())),
+        }
+    }
+
+    pub fn start(&self) -> usize {
+        self.start
+    }
+
+    pub fn length(&self) -> usize {
+        self.length
+    }
+
+    pub fn reserved(&self) -> usize {
+        self.reserved
+    }
+
+    // pub fn lock(&self) -> RwLockReadGuard<'_, ()> {
+    //     self.lock.read()
+    // }
+}
+
+// #[derive(Debug, Encode, Decode)]
+// pub struct RegionInner {
+//     start: usize,
+//     length: usize,
+//     reserved: usize,
+// }
+
+// impl From<Region> for RegionInner {
+//     fn from(value: Region) -> Self {
+//         Self {
+//             start: value.start,
+//             length: value.length,
+//             reserved: value.reserved,
+//         }
+//     }
+// }
+
+// impl From<RegionInner> for Region {
+//     fn from(value: RegionInner) -> Self {
+//         Self {
+//             start: value.start,
+//             length: value.length,
+//             reserved: value.reserved,
+//             lock: Arc::new(RwLock::new(())),
+//         }
+//     }
+// }