core::arc - add an assert

2012-08-01 18:51:53 -04:00 · 2012-08-01 18:51:53 -04:00 · 0c3158b3a5
commit 0c3158b3a5
parent fd536d9d3e
1 changed files with 1 additions and 0 deletions
--- a/src/libcore/arc.rs
+++ b/src/libcore/arc.rs
@ -112,6 +112,7 @@ impl methods<T: send> for exclusive<T> {
    unsafe fn with<U>(f: fn(sys::condition, x: &mut T) -> U) -> U {
        let ptr: ~arc_data<ex_data<T>> =
            unsafe::reinterpret_cast(self.data);
+        assert ptr.count > 0;
        let r = {
            let rec: &ex_data<T> = &(*ptr).data;
            rec.lock.lock_cond(|c| f(c, &mut rec.data))