numinnex commented on code in PR #2944:
URL: https://github.com/apache/iggy/pull/2944#discussion_r2944748214
##########
core/buf/src/lib.rs:
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@@ -0,0 +1,381 @@
+use std::mem::ManuallyDrop;
+use std::ptr::NonNull;
+use std::slice;
+use std::sync::atomic::{AtomicUsize, Ordering, fence};
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Owned {
+ inner: Vec<u8>,
+}
+
+#[derive(Clone, Copy)]
+struct Half {
+ ptr: NonNull<u8>,
+ len: usize,
+ ctrlb: NonNull<ControlBlock>,
+}
+
+struct ControlBlock {
+ ref_count: AtomicUsize,
+ base: NonNull<u8>,
+ len: usize,
+ cap: usize,
+}
+
+fn create_control_block(base: NonNull<u8>, len: usize, cap: usize) ->
NonNull<ControlBlock> {
+ let ctrlb = Box::new(ControlBlock {
+ ref_count: AtomicUsize::new(1),
+ base,
+ len,
+ cap,
+ });
+ // SAFETY: `ctrlb` is a valid control block for the lifetime of the
returned halves.
+ unsafe { NonNull::new_unchecked(Box::into_raw(ctrlb)) }
+}
+
+pub struct TwoHalves {
Review Comment:
I wanted to create general purpose mechanism for an split buffer. Yes we
will use it for header + body of `Message`, but we might want to use it for
something else aswell.
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