70 lines
1.9 KiB
Rust
70 lines
1.9 KiB
Rust
//! Test a cycle where no queries recover that occurs across threads.
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//! See the `../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::{Knobs, ParDatabaseImpl};
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use expect_test::expect;
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use salsa::ParallelDatabase;
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use test_log::test;
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#[test]
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fn parallel_cycle_none_recover() {
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let db = ParDatabaseImpl::default();
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db.knobs().signal_on_will_block.set(3);
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let thread_a = std::thread::spawn({
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let db = db.snapshot();
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move || db.a(-1)
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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 || db.b(-1)
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});
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// We expect B to panic because it detects a cycle (it is the one that calls A, ultimately).
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// Right now, it panics with a string.
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let err_b = thread_b.join().unwrap_err();
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if let Some(c) = err_b.downcast_ref::<salsa::Cycle>() {
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expect![[r#"
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[
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"a(-1)",
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"b(-1)",
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]
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"#]]
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.assert_debug_eq(&c.unexpected_participants(&db));
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} else {
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panic!("b failed in an unexpected way: {:?}", err_b);
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}
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// We expect A to propagate a panic, which causes us to use the sentinel
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// type `Canceled`.
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assert!(thread_a.join().unwrap_err().downcast_ref::<salsa::Cycle>().is_some());
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}
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#[salsa::query_group(ParallelCycleNoneRecover)]
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pub(crate) trait TestDatabase: Knobs {
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fn a(&self, key: i32) -> i32;
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fn b(&self, key: i32) -> i32;
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}
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fn a(db: &dyn TestDatabase, key: i32) -> 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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db.b(key)
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}
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fn b(db: &dyn TestDatabase, key: i32) -> 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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// Now try to execute A
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db.a(key)
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}
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