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Impl Drop for Lua

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This commit is contained in:
Alex Orlenko 2019-10-15 16:39:30 +01:00
parent ec08a76a41
commit 85607d8bfc
1 changed files with 24 additions and 3 deletions
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27
src/lua.rs
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@ -30,6 +30,7 @@ pub struct Lua {
pub(crate) state: *mut ffi::lua_State,
main_state: *mut ffi::lua_State,
extra: Arc<RefCell<ExtraData>>,
ephemeral: bool,
// Lua has lots of interior mutability, should not be RefUnwindSafe
_no_ref_unwind_safe: PhantomData<UnsafeCell<()>>,
}
@ -47,9 +48,25 @@ struct ExtraData {
unsafe impl Send for Lua {}
impl Drop for Lua {
fn drop(&mut self) {
unsafe {
if !self.ephemeral {
let mut extra = self.extra.borrow_mut();
mlua_debug_assert!(
ffi::lua_gettop(extra.ref_thread) == extra.ref_stack_max
&& extra.ref_stack_max as usize == extra.ref_free.len(),
"reference leak detected"
);
*mlua_expect!(extra.registry_unref_list.lock(), "unref list poisoned") = None;
ffi::lua_close(self.state);
}
}
}
}
impl Lua {
// Creates a new Lua state and loads standard library without the debug library.
#[doc(hidden)]
/// Creates a new Lua state and loads standard library without the `debug` library.
pub fn new() -> Lua {
unsafe {
let state = ffi::luaL_newstate();
@ -70,7 +87,9 @@ impl Lua {
#[cfg(not(feature = "lua53"))]
ffi::lua_pop(state, 7);
Lua::init_from_ptr(state)
let mut lua = Lua::init_from_ptr(state);
lua.ephemeral = false;
lua
}
}
@ -158,6 +177,7 @@ impl Lua {
state,
main_state: main_state,
extra: extra,
ephemeral: true,
_no_ref_unwind_safe: PhantomData,
}
}
@ -1035,6 +1055,7 @@ impl Lua {
state: state,
main_state: get_main_state(state),
extra: (*extra).clone(),
ephemeral: true,
_no_ref_unwind_safe: PhantomData,
};