mirror of
https://github.com/mlua-rs/mlua
synced 2026-06-08 16:05:43 +00:00
Alex Orlenko
63a255bbc9
The `is_sync::<T>()` runtime check relied on implicit specialization via `Copy`/`Clone` array behavior, which has changed in Rust 1.86+. `UserDataRef` always taking an exclusive lock even for `Sync` userdata, preventing concurrent shared borrows. With the `send` feature flag enabled, userdata types must now be `Send + Sync`. This is a breaking change, `T: Send + !Sync` userdata types can be wrapped in a `Mutex` or used inside a `Scope` where this restriction is lifted.
42 lines
1.2 KiB
Rust
42 lines
1.2 KiB
Rust
#![cfg(feature = "send")]
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use mlua::{AnyUserData, Lua, ObjectLike, Result, UserData, UserDataMethods, UserDataRef};
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use static_assertions::assert_impl_all;
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#[test]
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fn test_userdata_multithread_access_sync() -> Result<()> {
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let lua = Lua::new();
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// This type is `Send` and `Sync`.
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struct MyUserData(String);
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assert_impl_all!(MyUserData: Send, Sync);
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impl UserData for MyUserData {
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fn add_methods<M: UserDataMethods<Self>>(methods: &mut M) {
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methods.add_method("method", |lua, this, ()| {
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let ud = lua.globals().get::<AnyUserData>("ud")?;
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assert!(ud.call_method::<()>("method2", ()).is_ok());
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Ok(this.0.clone())
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});
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methods.add_method("method2", |_, _, ()| Ok(()));
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}
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}
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lua.globals().set("ud", MyUserData("hello".to_string()))?;
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// We acquired the shared reference.
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let _ud = lua.globals().get::<UserDataRef<MyUserData>>("ud")?;
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std::thread::scope(|s| {
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s.spawn(|| {
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// Getting another shared reference for `Sync` type is allowed.
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let _ = lua.globals().get::<UserDataRef<MyUserData>>("ud").unwrap();
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});
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});
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lua.load("ud:method()").exec().unwrap();
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Ok(())
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}
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