std::rt: require known stack bounds for all tasks.

We just approximate with a 1 or 2 MB stack for native::start.

2 files changed, 3 insertions, 2 deletions

diff --git a/src/libstd/rt/mod.rs b/src/libstd/rt/mod.rs
index 050caef86eb..95e39872b74 100644
--- a/src/libstd/rt/mod.rs
+++ b/src/libstd/rt/mod.rs
@@ -159,7 +159,8 @@ pub trait Runtime {
     // you're in.
     fn spawn_sibling(~self, cur_task: ~Task, opts: TaskOpts, f: proc());
     fn local_io<'a>(&'a mut self) -> Option<rtio::LocalIo<'a>>;
-    fn stack_bounds(&self) -> Option<(uint, uint)>; // (lo, hi)
+    /// The (low, high) edges of the current stack.
+    fn stack_bounds(&self) -> (uint, uint); // (lo, hi)
 
     // XXX: This is a serious code smell and this should not exist at all.
     fn wrap(~self) -> ~Any;
diff --git a/src/libstd/rt/task.rs b/src/libstd/rt/task.rs
index 3efa979e515..6fb1d111015 100644
--- a/src/libstd/rt/task.rs
+++ b/src/libstd/rt/task.rs
@@ -285,7 +285,7 @@ impl Task {
     /// Returns the stack bounds for this task in (lo, hi) format. The stack
     /// bounds may not be known for all tasks, so the return value may be
     /// `None`.
-    pub fn stack_bounds(&self) -> Option<(uint, uint)> {
+    pub fn stack_bounds(&self) -> (uint, uint) {
         self.imp.get_ref().stack_bounds()
     }
 }