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use std::panic::catch_unwind;
use mlua::{Error, Function, Lua, Result, Thread, ThreadStatus};
#[test]
fn test_thread() -> Result<()> {
let lua = Lua::new();
let thread = lua.create_thread(
lua.load(
r#"
function (s)
local sum = s
for i = 1,4 do
sum = sum + coroutine.yield(sum)
end
return sum
end
"#,
)
.eval()?,
)?;
assert_eq!(thread.status(), ThreadStatus::Resumable);
assert_eq!(thread.resume::<_, i64>(0)?, 0);
assert_eq!(thread.status(), ThreadStatus::Resumable);
assert_eq!(thread.resume::<_, i64>(1)?, 1);
assert_eq!(thread.status(), ThreadStatus::Resumable);
assert_eq!(thread.resume::<_, i64>(2)?, 3);
assert_eq!(thread.status(), ThreadStatus::Resumable);
assert_eq!(thread.resume::<_, i64>(3)?, 6);
assert_eq!(thread.status(), ThreadStatus::Resumable);
assert_eq!(thread.resume::<_, i64>(4)?, 10);
assert_eq!(thread.status(), ThreadStatus::Unresumable);
let accumulate = lua.create_thread(
lua.load(
r#"
function (sum)
while true do
sum = sum + coroutine.yield(sum)
end
end
"#,
)
.eval::<Function>()?,
)?;
for i in 0..4 {
accumulate.resume::<_, ()>(i)?;
}
assert_eq!(accumulate.resume::<_, i64>(4)?, 10);
assert_eq!(accumulate.status(), ThreadStatus::Resumable);
assert!(accumulate.resume::<_, ()>("error").is_err());
assert_eq!(accumulate.status(), ThreadStatus::Error);
let thread = lua
.load(
r#"
coroutine.create(function ()
while true do
coroutine.yield(42)
end
end)
"#,
)
.eval::<Thread>()?;
assert_eq!(thread.status(), ThreadStatus::Resumable);
assert_eq!(thread.resume::<_, i64>(())?, 42);
let thread: Thread = lua
.load(
r#"
coroutine.create(function(arg)
assert(arg == 42)
local yieldarg = coroutine.yield(123)
assert(yieldarg == 43)
return 987
end)
"#,
)
.eval()?;
assert_eq!(thread.resume::<_, u32>(42)?, 123);
assert_eq!(thread.resume::<_, u32>(43)?, 987);
match thread.resume::<_, u32>(()) {
Err(Error::CoroutineInactive) => {}
Err(_) => panic!("resuming dead coroutine error is not CoroutineInactive kind"),
_ => panic!("resuming dead coroutine did not return error"),
}
Ok(())
}
#[cfg(any(feature = "lua54", all(feature = "luajit", feature = "vendored")))]
#[test]
fn test_thread_reset() -> Result<()> {
use mlua::{AnyUserData, UserData};
use std::sync::Arc;
let lua = Lua::new();
struct MyUserData(Arc<()>);
impl UserData for MyUserData {}
let arc = Arc::new(());
let func: Function = lua.load(r#"function(ud) coroutine.yield(ud) end"#).eval()?;
let thread = lua.create_thread(func.clone())?;
for _ in 0..2 {
assert_eq!(thread.status(), ThreadStatus::Resumable);
let _ = thread.resume::<_, AnyUserData>(MyUserData(arc.clone()))?;
assert_eq!(thread.status(), ThreadStatus::Resumable);
assert_eq!(Arc::strong_count(&arc), 2);
thread.resume::<_, ()>(())?;
assert_eq!(thread.status(), ThreadStatus::Unresumable);
thread.reset(func.clone())?;
lua.gc_collect()?;
assert_eq!(Arc::strong_count(&arc), 1);
}
// Check for errors (Lua 5.4 only)
#[cfg(feature = "lua54")]
{
let func: Function = lua.load(r#"function(ud) error("test error") end"#).eval()?;
let thread = lua.create_thread(func.clone())?;
let _ = thread.resume::<_, AnyUserData>(MyUserData(arc.clone()));
assert_eq!(thread.status(), ThreadStatus::Error);
assert_eq!(Arc::strong_count(&arc), 2);
assert!(thread.reset(func.clone()).is_err());
assert_eq!(thread.status(), ThreadStatus::Error);
}
Ok(())
}
#[test]
fn coroutine_from_closure() -> Result<()> {
let lua = Lua::new();
let thrd_main = lua.create_function(|_, ()| Ok(()))?;
lua.globals().set("main", thrd_main)?;
#[cfg(any(
feature = "lua54",
feature = "lua53",
feature = "lua52",
feature = "luajit"
))]
let thrd: Thread = lua.load("coroutine.create(main)").eval()?;
#[cfg(feature = "lua51")]
let thrd: Thread = lua
.load("coroutine.create(function(...) return main(unpack(arg)) end)")
.eval()?;
thrd.resume::<_, ()>(())?;
Ok(())
}
#[test]
fn coroutine_panic() {
match catch_unwind(|| -> Result<()> {
// check that coroutines propagate panics correctly
let lua = Lua::new();
let thrd_main = lua.create_function(|_, ()| -> Result<()> {
panic!("test_panic");
})?;
lua.globals().set("main", thrd_main.clone())?;
let thrd: Thread = lua.create_thread(thrd_main)?;
thrd.resume(())
}) {
Ok(r) => panic!("coroutine panic not propagated, instead returned {:?}", r),
Err(p) => assert!(*p.downcast::<&str>().unwrap() == "test_panic"),
}
}
|
