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Under this design, *all* databases are a `DatabaseImpl<U>`, where the `U` implements `UserData` (you can use `()` if there is none). Code would default to `&dyn salsa::Database` but if you want to give access to the userdata, you can define a custom database trait `MyDatabase: salsa::Databse` so long as you * annotate `MyDatabase` trait definition of impls of `MyDatabase` with `#[salsa::db]` * implement `MyDatabase` for `DatabaseImpl<U>` where `U` is your userdata (this could be a blanket impl, if you don't know the precise userdata type). The `tests/common/mod.rs` shows the pattern.
71 lines
1.6 KiB
Rust
71 lines
1.6 KiB
Rust
//! Test for cycle recover spread across two threads.
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//! See `../cycles.rs` for a complete listing of cycle tests,
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//! both intra and cross thread.
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use salsa::Cancelled;
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use salsa::DatabaseImpl;
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use salsa::Handle;
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use salsa::Setter;
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use crate::setup::Knobs;
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use crate::setup::KnobsDatabase;
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#[salsa::input]
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struct MyInput {
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field: i32,
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}
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#[salsa::tracked]
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fn a1(db: &dyn KnobsDatabase, input: MyInput) -> MyInput {
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db.signal(1);
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db.wait_for(2);
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dummy(db, input)
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}
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#[salsa::tracked]
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fn dummy(_db: &dyn KnobsDatabase, _input: MyInput) -> MyInput {
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panic!("should never get here!")
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}
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// Cancellation signalling test
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//
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// The pattern is as follows.
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//
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// Thread A Thread B
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// -------- --------
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// a1
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// | wait for stage 1
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// signal stage 1 set input, triggers cancellation
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// wait for stage 2 (blocks) triggering cancellation sends stage 2
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// |
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// (unblocked)
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// dummy
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// panics
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#[test]
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fn execute() {
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let mut db = Handle::new(<DatabaseImpl<Knobs>>::default());
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db.knobs().signal_on_will_block.store(3);
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let input = MyInput::new(&*db, 1);
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let thread_a = std::thread::spawn({
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let db = db.clone();
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move || a1(&*db, input)
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});
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input.set_field(db.get_mut()).to(2);
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// Assert thread A *should* was cancelled
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let cancelled = thread_a
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.join()
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.unwrap_err()
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.downcast::<Cancelled>()
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.unwrap();
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// and inspect the output
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expect_test::expect![[r#"
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PendingWrite
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"#]]
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.assert_debug_eq(&cancelled);
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}
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