### Basic Database Operations with sled in Rust

Source: https://github.com/spacejam/sled/blob/main/README.md

This snippet demonstrates fundamental operations using the `sled` embedded database in Rust. It covers opening a database tree, inserting and retrieving key-value pairs, performing range queries, deleting entries, and executing an atomic compare-and-swap operation. It also shows how to flush changes to disk for durability.

```Rust
let tree = sled::open("/tmp/welcome-to-sled")?;

// insert and get, similar to std's BTreeMap
let old_value = tree.insert("key", "value")?;

assert_eq!(
  tree.get(&"key")?,
  Some(sled::IVec::from("value")),
);

// range queries
for kv_result in tree.range("key_1".."key_9") {}

// deletion
let old_value = tree.remove(&"key")?;

// atomic compare and swap
tree.compare_and_swap(
  "key",
  Some("current_value"),
  Some("new_value"),
)?;

// block until all operations are stable on disk
// (flush_async also available to get a Future)
tree.flush()?;
```

--------------------------------

### Subscribing to sled Events Asynchronously (Rust)

Source: https://github.com/spacejam/sled/blob/main/README.md

This snippet demonstrates how to asynchronously subscribe to events on key prefixes in a `sled` database. It initializes a `sled` database, creates a `Subscriber` for all key prefixes, inserts a key-value pair to trigger an event, and then uses `extreme::run` to await and process incoming events. The `Subscriber` struct implements `Future<Output=Option<Event>>`, allowing it to be awaited in an async context.

```Rust
let sled = sled::open("my_db").unwrap();

let mut sub = sled.watch_prefix("");

sled.insert(b"a", b"a").unwrap();

extreme::run(async move {
    while let Some(event) = (&mut sub).await {
        println!("got event {:?}", event);
    }
});
```

--------------------------------

### Iterating Subscriber Events with Async/Await in Rust

Source: https://github.com/spacejam/sled/blob/main/CHANGELOG.md

This snippet demonstrates how to asynchronously iterate over events from a `Subscriber` instance in Rust. Since `Subscriber` now implements `Future`, it can be awaited in a loop to process incoming events, enabling efficient prefix watching. The loop continues as long as new events are available.

```Rust
while let Some(event) = (&mut subscriber).await {}
```

--------------------------------

### Suppressing TSAN Race on Arc::drop in Rust

Source: https://github.com/spacejam/sled/blob/main/tsan_suppressions.txt

This suppression addresses a false positive race detection by ThreadSanitizer in Rust's `Arc::drop` implementation. TSAN fails to correctly reason about the raw atomic `Acquire` fence used after the strong-count atomic subtraction with a `Release` fence in the `Drop` implementation, leading to an erroneous race report.

```TSAN Suppression
race:Arc*drop
```

--------------------------------

### Suppressing TSAN Race on std::thread::local in Rust

Source: https://github.com/spacejam/sled/blob/main/tsan_suppressions.txt

This suppression addresses ThreadSanitizer false positives when using Rust's `std::thread::local`. Similar to `lazy_static`, `std::thread::local` utilizes implicit barriers that TSAN fails to recognize, leading to incorrect race condition reports.

```TSAN Suppression
race:std::thread::local
```

--------------------------------

### Suppressing TSAN Race on lazy_static in Rust

Source: https://github.com/spacejam/sled/blob/main/tsan_suppressions.txt

This suppression targets ThreadSanitizer false positives related to the `lazy_static` crate in Rust. `lazy_static` relies on implicit memory barriers that TSAN does not correctly detect, causing it to report races where none exist.

```TSAN Suppression
race:lazy_static
```

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