1 files changed, 22 insertions, 4 deletions
diff --git a/ctr-std/src/sys_common/thread.rs b/ctr-std/src/sys_common/thread.rs
index bb6baae..f1379b6 100644
--- a/ctr-std/src/sys_common/thread.rs
+++ b/ctr-std/src/sys_common/thread.rs
@@ -9,14 +9,32 @@
 // except according to those terms.
 
 use alloc::boxed::FnBox;
-use libc;
-//use sys::stack_overflow;
+use env;
+use sync::atomic::{self, Ordering};
+use sys::stack_overflow;
+use sys::thread as imp;
 
-pub unsafe fn start_thread(main: *mut libc::c_void) {
+#[allow(dead_code)]
+pub unsafe fn start_thread(main: *mut u8) {
     // Next, set up our stack overflow handler which may get triggered if we run
     // out of stack.
-    // let _handler = stack_overflow::Handler::new();
+    let _handler = stack_overflow::Handler::new();
 
     // Finally, let's run some code.
     Box::from_raw(main as *mut Box<FnBox()>)()
 }
+
+pub fn min_stack() -> usize {
+    static MIN: atomic::AtomicUsize = atomic::AtomicUsize::new(0);
+    match MIN.load(Ordering::SeqCst) {
+        0 => {}
+        n => return n - 1,
+    }
+    let amt = env::var("RUST_MIN_STACK").ok().and_then(|s| s.parse().ok());
+    let amt = amt.unwrap_or(imp::DEFAULT_MIN_STACK_SIZE);
+
+    // 0 is our sentinel value, so ensure that we'll never see 0 after
+    // initialization has run
+    MIN.store(amt + 1, Ordering::SeqCst);
+    amt
+}