mirror of
https://github.com/rust-lang/rust-analyzer
synced 2024-12-29 06:23:25 +00:00
125 lines
4 KiB
Rust
125 lines
4 KiB
Rust
use crate::setup::{Knobs, ParDatabase, ParDatabaseImpl, WithValue};
|
|
use ra_salsa::ParallelDatabase;
|
|
use std::panic::{self, AssertUnwindSafe};
|
|
|
|
/// Test where two threads are executing sum. We show that they can
|
|
/// both be executing sum in parallel by having thread1 wait for
|
|
/// thread2 to send a signal before it leaves (similarly, thread2
|
|
/// waits for thread1 to send a signal before it enters).
|
|
#[test]
|
|
fn true_parallel_different_keys() {
|
|
let mut db = ParDatabaseImpl::default();
|
|
|
|
db.set_input('a', 100);
|
|
db.set_input('b', 10);
|
|
db.set_input('c', 1);
|
|
|
|
// Thread 1 will signal stage 1 when it enters and wait for stage 2.
|
|
let thread1 = std::thread::spawn({
|
|
let db = db.snapshot();
|
|
move || {
|
|
let v = db
|
|
.knobs()
|
|
.sum_signal_on_entry
|
|
.with_value(1, || db.knobs().sum_wait_for_on_exit.with_value(2, || db.sum("a")));
|
|
v
|
|
}
|
|
});
|
|
|
|
// Thread 2 will wait_for stage 1 when it enters and signal stage 2
|
|
// when it leaves.
|
|
let thread2 = std::thread::spawn({
|
|
let db = db.snapshot();
|
|
move || {
|
|
let v = db
|
|
.knobs()
|
|
.sum_wait_for_on_entry
|
|
.with_value(1, || db.knobs().sum_signal_on_exit.with_value(2, || db.sum("b")));
|
|
v
|
|
}
|
|
});
|
|
|
|
assert_eq!(thread1.join().unwrap(), 100);
|
|
assert_eq!(thread2.join().unwrap(), 10);
|
|
}
|
|
|
|
/// Add a test that tries to trigger a conflict, where we fetch
|
|
/// `sum("abc")` from two threads simultaneously, and of them
|
|
/// therefore has to block.
|
|
#[test]
|
|
fn true_parallel_same_keys() {
|
|
let mut db = ParDatabaseImpl::default();
|
|
|
|
db.set_input('a', 100);
|
|
db.set_input('b', 10);
|
|
db.set_input('c', 1);
|
|
|
|
// Thread 1 will wait_for a barrier in the start of `sum`
|
|
let thread1 = std::thread::spawn({
|
|
let db = db.snapshot();
|
|
move || {
|
|
let v = db
|
|
.knobs()
|
|
.sum_signal_on_entry
|
|
.with_value(1, || db.knobs().sum_wait_for_on_entry.with_value(2, || db.sum("abc")));
|
|
v
|
|
}
|
|
});
|
|
|
|
// Thread 2 will wait until Thread 1 has entered sum and then --
|
|
// once it has set itself to block -- signal Thread 1 to
|
|
// continue. This way, we test out the mechanism of one thread
|
|
// blocking on another.
|
|
let thread2 = std::thread::spawn({
|
|
let db = db.snapshot();
|
|
move || {
|
|
db.knobs().signal.wait_for(1);
|
|
db.knobs().signal_on_will_block.set(2);
|
|
db.sum("abc")
|
|
}
|
|
});
|
|
|
|
assert_eq!(thread1.join().unwrap(), 111);
|
|
assert_eq!(thread2.join().unwrap(), 111);
|
|
}
|
|
|
|
/// Add a test that tries to trigger a conflict, where we fetch `sum("a")`
|
|
/// from two threads simultaneously. After `thread2` begins blocking,
|
|
/// we force `thread1` to panic and should see that propagate to `thread2`.
|
|
#[test]
|
|
fn true_parallel_propagate_panic() {
|
|
let mut db = ParDatabaseImpl::default();
|
|
|
|
db.set_input('a', 1);
|
|
|
|
// `thread1` will wait_for a barrier in the start of `sum`. Once it can
|
|
// continue, it will panic.
|
|
let thread1 = std::thread::spawn({
|
|
let db = db.snapshot();
|
|
move || {
|
|
let v = db.knobs().sum_signal_on_entry.with_value(1, || {
|
|
db.knobs()
|
|
.sum_wait_for_on_entry
|
|
.with_value(2, || db.knobs().sum_should_panic.with_value(true, || db.sum("a")))
|
|
});
|
|
v
|
|
}
|
|
});
|
|
|
|
// `thread2` will wait until `thread1` has entered sum and then -- once it
|
|
// has set itself to block -- signal `thread1` to continue.
|
|
let thread2 = std::thread::spawn({
|
|
let db = db.snapshot();
|
|
move || {
|
|
db.knobs().signal.wait_for(1);
|
|
db.knobs().signal_on_will_block.set(2);
|
|
db.sum("a")
|
|
}
|
|
});
|
|
|
|
let result1 = panic::catch_unwind(AssertUnwindSafe(|| thread1.join().unwrap()));
|
|
let result2 = panic::catch_unwind(AssertUnwindSafe(|| thread2.join().unwrap()));
|
|
|
|
assert!(result1.is_err());
|
|
assert!(result2.is_err());
|
|
}
|