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Some comments giving some idea how to use these things.

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This commit is contained in:
Eric Holk 2012-05-23 16:34:00 -07:00
parent 5b72e52e47
commit 30f8555544
1 changed files with 10 additions and 2 deletions
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12
src/libstd/arc.rs
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@ -1,5 +1,5 @@
#[doc = "An atomically reference counted wrapper that can be used
hare immutable data between tasks."]
#[doc = "An atomically reference counted wrapper that can be used to
share immutable data between tasks."]
export arc, get, clone;
@ -34,6 +34,7 @@ resource arc_destruct<T>(data: *arc_data<T>) {
type arc<T> = arc_destruct<T>;
#[doc="Create an atomically reference counted wrapper."]
fn arc<T>(-data: T) -> arc<T> {
let data = ~{mut count: 1, data: data};
unsafe {
@ -43,12 +44,19 @@ fn arc<T>(-data: T) -> arc<T> {
}
}
#[doc="Access the underlying data in an atomically reference counted
wrapper."]
fn get<T>(rc: &a.arc<T>) -> &a.T {
unsafe {
&(***rc).data
}
}
#[doc="Duplicate an atomically reference counted wrapper.
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 {