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100 lines
2.6 KiB
Rust
100 lines
2.6 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 crate::setup::Database;
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use crate::setup::Knobs;
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use salsa::ParallelDatabase;
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pub(crate) trait Db: salsa::DbWithJar<Jar> + Knobs {}
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impl<T: salsa::DbWithJar<Jar> + Knobs> Db for T {}
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#[salsa::jar(db = Db)]
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pub(crate) struct Jar(MyInput, a1, a2, b1, b2);
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#[salsa::input]
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pub(crate) struct MyInput {
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field: i32,
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}
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#[salsa::tracked]
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pub(crate) fn a1(db: &dyn Db, input: MyInput) -> i32 {
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// Wait to create the cycle until both threads have entered
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db.signal(1);
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db.wait_for(2);
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a2(db, input)
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}
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#[salsa::tracked(jar = Jar, recovery_fn=recover)]
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pub(crate) fn a2(db: &dyn Db, input: MyInput) -> i32 {
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b1(db, input)
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}
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fn recover(db: &dyn Db, _cycle: &salsa::Cycle, key: MyInput) -> i32 {
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dbg!("recover");
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key.field(db) * 20 + 2
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}
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#[salsa::tracked]
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pub(crate) fn b1(db: &dyn Db, input: MyInput) -> i32 {
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// Wait to create the cycle until both threads have entered
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db.wait_for(1);
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db.signal(2);
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// Wait for thread A to block on this thread
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db.wait_for(3);
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b2(db, input)
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}
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#[salsa::tracked]
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pub(crate) fn b2(db: &dyn Db, input: MyInput) -> i32 {
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a1(db, input)
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}
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// Recover cycle 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 b1
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// | wait for stage 1 (blocks)
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// signal stage 1 |
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// wait for stage 2 (blocks) (unblocked)
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// | signal stage 2
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// (unblocked) wait for stage 3 (blocks)
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// a2 |
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// b1 (blocks -> stage 3) |
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// | (unblocked)
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// | b2
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// | a1 (cycle detected)
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// a2 recovery fn executes |
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// a1 completes normally |
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// b2 completes, recovers
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// b1 completes, recovers
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#[test]
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fn execute() {
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let db = Database::default();
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db.knobs().signal_on_will_block.set(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.snapshot();
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move || a1(&*db, input)
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});
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let thread_b = std::thread::spawn({
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let db = db.snapshot();
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move || b1(&*db, input)
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});
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// We expect that the recovery function yields
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// `1 * 20 + 2`, which is returned (and forwarded)
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// to b1, and from there to a2 and a1.
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assert_eq!(thread_a.join().unwrap(), 22);
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assert_eq!(thread_b.join().unwrap(), 22);
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}
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