Ready for publish
This commit is contained in:
@@ -2,5 +2,8 @@
|
||||
name = "access-cell"
|
||||
version = "0.1.0"
|
||||
edition = "2024"
|
||||
description = "A cell that allows **re-entrant mutable access** without deadlock"
|
||||
license = "Apache-2.0"
|
||||
repository = "https://github.com/selimaj-dev/access-cell"
|
||||
|
||||
[dependencies]
|
||||
|
||||
@@ -1,19 +1,58 @@
|
||||
# access-cell
|
||||
A synchronous, single-threaded Mutex<T> anti-locking system
|
||||
|
||||
A cell that allows **re-entrant mutable access** without deadlock. Use it when you need something like a single-threaded “Mutex” where callbacks might need to access the same value again.
|
||||
|
||||
## Why?
|
||||
|
||||
With a normal `Mutex<T>`, if you lock it and then try to lock it again from the same thread (e.g. in a callback), you deadlock. `AccessCell<T>` avoids that: the first `access` runs immediately; any further `access` calls from inside that closure are **queued** and run in order after the current closure finishes.
|
||||
|
||||
So you can safely do “lock → do work → call something that also wants to lock” without re-entrancy causing a deadlock.
|
||||
|
||||
## Example
|
||||
|
||||
```rust
|
||||
let value = Arc::new(AccessCell::new(0));
|
||||
use access_cell::AccessCell;
|
||||
use std::sync::Arc;
|
||||
|
||||
value.access({
|
||||
let value = value.clone();
|
||||
let cell = Arc::new(AccessCell::new(0));
|
||||
|
||||
cell.access({
|
||||
let cell = cell.clone();
|
||||
move |_| {
|
||||
// normally this would cause a deadlock
|
||||
value.access(|v| {
|
||||
// Nested access would deadlock with a Mutex, here it’s queued and runs after.
|
||||
cell.access(|v| {
|
||||
*v = 10;
|
||||
})
|
||||
});
|
||||
}
|
||||
});
|
||||
|
||||
assert_eq!(*value.access_ref(), 10);
|
||||
assert_eq!(*cell.access_ref(), 10);
|
||||
```
|
||||
|
||||
## API
|
||||
|
||||
| Method | Description |
|
||||
|--------|-------------|
|
||||
| `AccessCell::new(value)` | Create a new cell wrapping `value`. |
|
||||
| `.access(\|v\| { ... })` | Run a closure with exclusive mutable access. Re-entrant calls are queued. |
|
||||
| `.access_ref()` | Borrow the value immutably (safe to call anytime). |
|
||||
| `.access_mut()` | **Unsafe** outside of an `access` closure. Use only inside a closure passed to `access`. |
|
||||
|
||||
## When to use it
|
||||
|
||||
- Single-threaded or “one logical owner” code where re-entrant access is possible (e.g. callbacks, event handlers).
|
||||
- When you want “exclusive access” semantics without a real lock, and you’re okay with nested work being deferred to a queue.
|
||||
|
||||
Not a replacement for `Mutex` in multi-threaded code; it does not provide thread-safe locking.
|
||||
|
||||
## Installation
|
||||
```bash
|
||||
cargo add access-cell
|
||||
```
|
||||
|
||||
Or manually
|
||||
|
||||
```toml
|
||||
[dependencies]
|
||||
access-cell = "0.1"
|
||||
```
|
||||
|
||||
Reference in New Issue
Block a user