Add coroutine support

examples/coroutines/src/main.rs

@@ -0,0 +1,28 @@
+extern crate bdwgc_alloc;
+extern crate coroutine;
+
+use bdwgc_alloc::Allocator;
+use coroutine::asymmetric::Coroutine;
+use std::alloc::{GlobalAlloc, Layout};
+
+#[global_allocator]
+static GLOBAL_ALLOCATOR: Allocator = Allocator;
+
+fn main() {
+    unsafe {
+        Allocator::initialize();
+        Allocator::disable_gc();
+    }
+
+    let handle = Coroutine::spawn(move |_, _| {
+        let bottom: u8 = 0;
+        unsafe { Allocator::set_stack_bottom(&bottom) }
+        Allocator::enable_gc();
+
+        loop {
+            unsafe { GLOBAL_ALLOCATOR.alloc(Layout::from_size_align(2 ^ 8, 8).unwrap()) };
+        }
+    });
+
+    for _ in handle {}
+}