fix selector and signal unsync default

packages/signals/Cargo.toml

@@ -14,6 +14,7 @@ simple_logger = "4.2.0"
 serde = { version = "1", features = ["derive"], optional = true }
 parking_lot = "0.12.1"
 once_cell = "1.18.0"
+ghost = "0.1.16"
 
 [dev-dependencies]
 dioxus = { workspace = true }

packages/signals/src/impls.rs

@@ -14,7 +14,7 @@ macro_rules! read_impls {
     ($ty:ident, $bound:path) => {
         impl<T: Default + 'static, S: $bound> Default for $ty<T, S> {
             fn default() -> Self {
-                Self::new(Default::default())
+                Self::new_maybe_sync(Default::default())
             }
         }
 

packages/signals/src/rt.rs

@@ -1,3 +1,4 @@
+use generational_box::UnsyncStorage;
 use std::mem::MaybeUninit;
 use std::ops::Deref;
 use std::rc::Rc;
@@ -44,7 +45,7 @@ fn owner_in_scope<S: Storage<T>, T>(scope: ScopeId) -> Rc<Owner<S>> {
 /// CopyValue is a wrapper around a value to make the value mutable and Copy.
 ///
 /// It is internally backed by [`generational_box::GenerationalBox`].
-pub struct CopyValue<T: 'static, S: Storage<T>> {
+pub struct CopyValue<T: 'static, S: Storage<T> = UnsyncStorage> {
     pub(crate) value: GenerationalBox<T, S>,
     origin_scope: ScopeId,
 }
@@ -71,11 +72,25 @@ where
     }
 }
 
-impl<T: 'static, S: Storage<T>> CopyValue<T, S> {
+impl<T: 'static> CopyValue<T> {
     /// Create a new CopyValue. The value will be stored in the current component.
     ///
     /// Once the component this value is created in is dropped, the value will be dropped.
     pub fn new(value: T) -> Self {
+        Self::new_maybe_sync(value)
+    }
+
+    /// Create a new CopyValue. The value will be stored in the given scope. When the specified scope is dropped, the value will be dropped.
+    pub fn new_in_scope(value: T, scope: ScopeId) -> Self {
+        Self::new_maybe_sync_in_scope(value, scope)
+    }
+}
+
+impl<T: 'static, S: Storage<T>> CopyValue<T, S> {
+    /// Create a new CopyValue. The value will be stored in the current component.
+    ///
+    /// Once the component this value is created in is dropped, the value will be dropped.
+    pub fn new_maybe_sync(value: T) -> Self {
         let owner = current_owner();
 
         Self {
@@ -85,7 +100,7 @@ impl<T: 'static, S: Storage<T>> CopyValue<T, S> {
     }
 
     /// Create a new CopyValue. The value will be stored in the given scope. When the specified scope is dropped, the value will be dropped.
-    pub fn new_in_scope(value: T, scope: ScopeId) -> Self {
+    pub fn new_maybe_sync_in_scope(value: T, scope: ScopeId) -> Self {
         let owner = owner_in_scope(scope);
 
         Self {

packages/signals/src/selector.rs

@@ -5,7 +5,7 @@ use crate::dependency::Dependency;
 use crate::use_signal;
 use crate::{get_effect_stack, signal::SignalData, CopyValue, Effect, ReadOnlySignal, Signal};
 
-/// Creates a new Selector. The selector will be run immediately and whenever any signal it reads changes.
+/// Creates a new unsync Selector. The selector will be run immediately and whenever any signal it reads changes.
 ///
 /// Selectors can be used to efficiently compute derived data from signals.
 ///
@@ -23,14 +23,41 @@ use crate::{get_effect_stack, signal::SignalData, CopyValue, Effect, ReadOnlySig
 /// }
 /// ```
 #[must_use = "Consider using `use_effect` to rerun a callback when dependencies change"]
-pub fn use_selector<R: PartialEq, S: Storage<SignalData<R>>>(
+pub fn use_selector<R: PartialEq>(
+    cx: &ScopeState,
+    f: impl FnMut() -> R + 'static,
+) -> ReadOnlySignal<R> {
+    use_maybe_sync_selector(cx, f)
+}
+
+
+/// Creates a new Selector that may be sync. The selector will be run immediately and whenever any signal it reads changes.
+///
+/// Selectors can be used to efficiently compute derived data from signals.
+///
+/// ```rust
+/// use dioxus::prelude::*;
+/// use dioxus_signals::*;
+///
+/// fn App(cx: Scope) -> Element {
+///     let mut count = use_signal(cx, || 0);
+///     let double = use_selector(cx, move || count * 2);
+///     count += 1;
+///     assert_eq!(double.value(), count * 2);
+///  
+///     render! { "{double}" }
+/// }
+/// ```
+#[must_use = "Consider using `use_effect` to rerun a callback when dependencies change"]
+pub fn use_maybe_sync_selector<R: PartialEq, S: Storage<SignalData<R>>>(
     cx: &ScopeState,
     f: impl FnMut() -> R + 'static,
 ) -> ReadOnlySignal<R, S> {
-    *cx.use_hook(|| selector(f))
+    *cx.use_hook(|| maybe_sync_selector(f))
 }
 
-/// Creates a new Selector with some local dependencies. The selector will be run immediately and whenever any signal it reads or any dependencies it tracks changes
+
+/// Creates a new unsync Selector with some local dependencies. The selector will be run immediately and whenever any signal it reads or any dependencies it tracks changes
 ///
 /// Selectors can be used to efficiently compute derived data from signals.
 ///
@@ -47,7 +74,35 @@ pub fn use_selector<R: PartialEq, S: Storage<SignalData<R>>>(
 /// }
 /// ```
 #[must_use = "Consider using `use_effect` to rerun a callback when dependencies change"]
-pub fn use_selector_with_dependencies<R: PartialEq, D: Dependency, S: Storage<SignalData<R>>>(
+pub fn use_selector_with_dependencies<R: PartialEq, D: Dependency, >(
+    cx: &ScopeState,
+    dependencies: D,
+    mut f: impl FnMut(D::Out) -> R + 'static,
+) -> ReadOnlySignal<R>
+where
+    D::Out: 'static,
+{   
+    use_maybe_sync_selector_with_dependencies(cx, dependencies, f)
+}
+
+/// Creates a new Selector that may be sync with some local dependencies. The selector will be run immediately and whenever any signal it reads or any dependencies it tracks changes
+///
+/// Selectors can be used to efficiently compute derived data from signals.
+///
+/// ```rust
+/// use dioxus::prelude::*;
+/// use dioxus_signals::*;
+///
+/// fn App(cx: Scope) -> Element {
+///     let mut local_state = use_state(cx, || 0);
+///     let double = use_selector_with_dependencies(cx, (local_state.get(),), move |(local_state,)| local_state * 2);
+///     local_state.set(1);
+///  
+///     render! { "{double}" }
+/// }
+/// ```
+#[must_use = "Consider using `use_effect` to rerun a callback when dependencies change"]
+pub fn use_maybe_sync_selector_with_dependencies<R: PartialEq, D: Dependency, S: Storage<SignalData<R>>>(
     cx: &ScopeState,
     dependencies: D,
     mut f: impl FnMut(D::Out) -> R + 'static,
@@ -57,7 +112,7 @@ where
 {
     let dependencies_signal = use_signal(cx, || dependencies.out());
     let selector = *cx.use_hook(|| {
-        selector(move || {
+        maybe_sync_selector(move || {
             let deref = &*dependencies_signal.read();
             f(deref.clone())
         })
@@ -69,10 +124,19 @@ where
     selector
 }
 
-/// Creates a new Selector. The selector will be run immediately and whenever any signal it reads changes.
+/// Creates a new unsync Selector. The selector will be run immediately and whenever any signal it reads changes.
+///
+/// Selectors can be used to efficiently compute derived data from signals.
+pub fn selector<R: PartialEq>(
+    mut f: impl FnMut() -> R + 'static,
+) -> ReadOnlySignal<R> {
+    maybe_sync_selector(f)
+}
+
+/// Creates a new Selector that may be Sync + Send. The selector will be run immediately and whenever any signal it reads changes.
 ///
 /// Selectors can be used to efficiently compute derived data from signals.
-pub fn selector<R: PartialEq, S: Storage<SignalData<R>>>(
+pub fn maybe_sync_selector<R: PartialEq, S: Storage<SignalData<R>>>(
     mut f: impl FnMut() -> R + 'static,
 ) -> ReadOnlySignal<R, S> {
     let state = Signal::<R, S> {
@@ -108,5 +172,5 @@ pub fn selector<R: PartialEq, S: Storage<SignalData<R>>>(
         }
     }));
 
-    ReadOnlySignal::new(state)
+    ReadOnlySignal::new_maybe_sync(state)
 }

packages/signals/src/signal.rs

@@ -170,7 +170,7 @@ pub struct SignalData<T> {
 ///     }
 /// }
 /// ```
-pub struct Signal<T: 'static, S: Storage<SignalData<T>>> {
+pub struct Signal<T: 'static, S: Storage<SignalData<T>> = UnsyncStorage> {
     pub(crate) inner: CopyValue<SignalData<T>, S>,
 }
 
@@ -188,11 +188,23 @@ impl<'de, T: serde::Deserialize<'de> + 'static> serde::Deserialize<'de> for Sign
     }
 }
 
-impl<T: 'static, S: Storage<SignalData<T>>> Signal<T, S> {
+impl<T: 'static> Signal<T> {
     /// Creates a new Signal. Signals are a Copy state management solution with automatic dependency tracking.
     pub fn new(value: T) -> Self {
+        Self::new_maybe_sync(value)
+    }
+
+    /// Create a new signal with a custom owner scope. The signal will be dropped when the owner scope is dropped instead of the current scope.
+    pub fn new_in_scope(value: T, owner: ScopeId) -> Self {
+        Self::new_maybe_sync_in_scope(value, owner)
+    }
+}
+
+impl<T: 'static, S: Storage<SignalData<T>>> Signal<T, S> {
+    /// Creates a new Signal. Signals are a Copy state management solution with automatic dependency tracking.
+    pub fn new_maybe_sync(value: T) -> Self {
         Self {
-            inner: CopyValue::new(SignalData {
+            inner: CopyValue::<SignalData<T>, S>::new_maybe_sync(SignalData {
                 subscribers: Default::default(),
                 update_any: schedule_update_any().expect("in a virtual dom"),
                 value,
@@ -202,9 +214,9 @@ impl<T: 'static, S: Storage<SignalData<T>>> Signal<T, S> {
     }
 
     /// Create a new signal with a custom owner scope. The signal will be dropped when the owner scope is dropped instead of the current scope.
-    pub fn new_in_scope(value: T, owner: ScopeId) -> Self {
+    pub fn new_maybe_sync_in_scope(value: T, owner: ScopeId) -> Self {
         Self {
-            inner: CopyValue::new_in_scope(
+            inner: CopyValue::<SignalData<T>, S>::new_maybe_sync_in_scope(
                 SignalData {
                     subscribers: Default::default(),
                     update_any: schedule_update_any().expect("in a virtual dom"),
@@ -228,10 +240,11 @@ impl<T: 'static, S: Storage<SignalData<T>>> Signal<T, S> {
     ) -> <<S as Storage<SignalData<T>>>::Ref as Mappable<SignalData<T>>>::Mapped<T> {
         let inner = self.inner.read();
         if let Some(effect) = inner.effect_stack.current() {
-            let mut subscribers = inner.subscribers.write();
-            let mut effect_subscribers = &mut subscribers.effect_subscribers;
-            if !effect_subscribers.contains(&effect) {
-                effect_subscribers.push(effect);
+            let subscribers = inner.subscribers.read();
+            if !subscribers.effect_subscribers.contains(&effect) {
+                drop(subscribers);
+                let mut subscribers = inner.subscribers.write();
+                subscribers.effect_subscribers.push(effect);
             }
         } else if let Some(current_scope_id) = current_scope_id() {
             // only subscribe if the vdom is rendering
@@ -241,17 +254,13 @@ impl<T: 'static, S: Storage<SignalData<T>>> Signal<T, S> {
                     self.inner.value,
                     current_scope_id
                 );
-                let mut subscribers = inner.subscribers.write();
-                let subscribers = &mut subscribers.subscribers;
-                if !subscribers.contains(&current_scope_id) {
-                    subscribers.push(current_scope_id);
+                let subscribers = inner.subscribers.read();
+                if !subscribers.subscribers.contains(&current_scope_id) {
                     drop(subscribers);
+                    let mut subscribers = inner.subscribers.write();
+                    subscribers.subscribers.push(current_scope_id);
                     let unsubscriber = current_unsubscriber();
-                    inner
-                        .subscribers
-                        .write()
-                        .subscribers
-                        .push(unsubscriber.scope);
+                    subscribers.subscribers.push(unsubscriber.scope);
                 }
             }
         }
@@ -441,13 +450,20 @@ impl<T, B: MappableMut<T>, S: Storage<SignalData<I>>, I> DerefMut for Write<T, B
 }
 
 /// A signal that can only be read from.
-pub struct ReadOnlySignal<T: 'static, S: Storage<SignalData<T>>> {
+pub struct ReadOnlySignal<T: 'static, S: Storage<SignalData<T>> = UnsyncStorage> {
     inner: Signal<T, S>,
 }
 
-impl<T: 'static, S: Storage<SignalData<T>>> ReadOnlySignal<T, S> {
+impl<T: 'static> ReadOnlySignal<T> {
     /// Create a new read-only signal.
-    pub fn new(signal: Signal<T, S>) -> Self {
+    pub fn new(signal: Signal<T>) -> Self {
+        Self::new_maybe_sync(signal)
+    }
+}
+
+impl<T: 'static, S: Storage<SignalData<T>>> ReadOnlySignal<T, S> {
+    /// Create a new read-only signal that is maybe sync.
+    pub fn new_maybe_sync(signal: Signal<T, S>) -> Self {
         Self { inner: signal }
     }