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auto merge of #4909 : saneyuki/servo/warn, r=jdm

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follow up #4893
This commit is contained in:
bors-servo 2015-02-12 14:06:49 -07:00
commit 6d1a2d90e5
1 changed files with 10 additions and 4 deletions
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14
components/script/dom/bindings/cell.rs
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@ -10,7 +10,7 @@ use js::jsapi::{JSTracer};
use util::task_state;
use util::task_state::{SCRIPT, IN_GC};
use std::cell::{RefCell, Ref, RefMut};
use std::cell::{BorrowState, RefCell, Ref, RefMut};
/// A mutable field in the DOM.
///
@ -52,7 +52,7 @@ impl<T> DOMRefCell<T> {
///
/// For safety checks in debug builds only.
pub fn is_mutably_borrowed(&self) -> bool {
self.value.try_borrow().is_some()
self.value.borrow_state() == BorrowState::Writing
}
/// Attempts to immutably borrow the wrapped value.
@ -67,7 +67,10 @@ impl<T> DOMRefCell<T> {
/// Panics if this is called off the script thread.
pub fn try_borrow<'a>(&'a self) -> Option<Ref<'a, T>> {
debug_assert!(task_state::get().is_script());
self.value.try_borrow()
match self.value.borrow_state() {
BorrowState::Writing => None,
_ => Some(self.value.borrow()),
}
}
/// Mutably borrows the wrapped value.
@ -82,7 +85,10 @@ impl<T> DOMRefCell<T> {
/// Panics if this is called off the script thread.
pub fn try_borrow_mut<'a>(&'a self) -> Option<RefMut<'a, T>> {
debug_assert!(task_state::get().is_script());
self.value.try_borrow_mut()
match self.value.borrow_state() {
BorrowState::Unused => Some(self.value.borrow_mut()),
_ => None,
}
}
}