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std: Modify arc to tolerate upcoming change to uniques

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This commit is contained in:
Brian Anderson 2012-05-25 16:22:29 -07:00
parent 174f789e0b
commit d89b4c8c61
1 changed files with 14 additions and 7 deletions
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21
src/libstd/arc.rs
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@ -19,15 +19,17 @@ type arc_data<T> = {
data: T
};
resource arc_destruct<T>(data: *arc_data<T>) {
resource arc_destruct<T>(data: *libc::c_void) {
unsafe {
let ptr = &mut (*data).count;
let data: ~arc_data<T> = unsafe::reinterpret_cast(data);
let ref_ptr = &mut data.count;
let new_count = rustrt::rust_atomic_decrement(ptr);
let new_count = rustrt::rust_atomic_decrement(ref_ptr);
assert new_count >= 0;
if new_count == 0 {
let _ptr : ~arc_data<T> = unsafe::reinterpret_cast(data);
// drop glue takes over.
} else {
unsafe::forget(data);
}
}
}
@ -48,7 +50,11 @@ fn arc<T>(-data: T) -> arc<T> {
wrapper."]
fn get<T>(rc: &a.arc<T>) -> &a.T {
unsafe {
&(***rc).data
let ptr: ~arc_data<T> = unsafe::reinterpret_cast(**rc);
// Cast us back into the correct region
let r = unsafe::reinterpret_cast(&ptr.data);
unsafe::forget(ptr);
ret r;
}
}
@ -58,9 +64,10 @@ The resulting two `arc` objects will point to the same underlying data
object. However, one of the `arc` objects can be sent to another task,
allowing them to share the underlying data."]
fn clone<T>(rc: &arc<T>) -> arc<T> {
let data = **rc;
unsafe {
rustrt::rust_atomic_increment(&mut (*data).count);
let ptr: ~arc_data<T> = unsafe::reinterpret_cast(**rc);
rustrt::rust_atomic_increment(&mut ptr.count);
unsafe::forget(ptr);
}
arc_destruct(**rc)
}