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rustrt: Reorganize task usage

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Most of the comments are available on the Task structure itself, but this commit
is aimed at making FFI-style usage of Rust tasks a little nicer.

Primarily, this commit enables re-use of tasks across multiple invocations. The
method `run` will no longer unconditionally destroy the task itself. Rather, the
task will be internally re-usable if the closure specified did not fail. Once a
task has failed once it is considered poisoned and it can never be used again.

Along the way I tried to document shortcomings of the current method of tearing
down a task, opening a few issues as well. For now none of the behavior is a
showstopper, but it's useful to acknowledge it. Also along the way I attempted
to remove as much `unsafe` code as possible, opting for safer abstractions.
This commit is contained in:
Alex Crichton 2014-06-13 16:03:41 -07:00
parent bab614f5fa
commit 7d756e44a9
9 changed files with 338 additions and 119 deletions
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15
src/libstd/task.rs
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@ -295,8 +295,8 @@ impl<S: Spawner> TaskBuilder<S> {
let (tx_done, rx_done) = channel(); // signal that task has exited
let (tx_retv, rx_retv) = channel(); // return value from task
let on_exit = proc(res) { tx_done.send(res) };
self.spawn_internal(proc() { tx_retv.send(f()) },
let on_exit = proc(res) { let _ = tx_done.send_opt(res); };
self.spawn_internal(proc() { let _ = tx_retv.send_opt(f()); },
Some(on_exit));
Future::from_fn(proc() {
@ -641,3 +641,14 @@ mod test {
// NOTE: the corresponding test for stderr is in run-pass/task-stderr, due
// to the test harness apparently interfering with stderr configuration.
}
#[test]
fn task_abort_no_kill_runtime() {
use std::io::timer;
use mem;
let mut tb = TaskBuilder::new();
let rx = tb.try_future(proc() {});
mem::drop(rx);
timer::sleep(1000);
}