-extern const StgInfoTable blockAsyncExceptionszh_ret_info;
-extern const StgInfoTable unblockAsyncExceptionszh_ret_info;
+extern const StgRetInfoTable stg_blockAsyncExceptionszh_ret_info;
+extern const StgRetInfoTable stg_unblockAsyncExceptionszh_ret_info;
+
+/* Determine whether a thread is interruptible (ie. blocked
+ * indefinitely). Interruptible threads can be sent an exception with
+ * killThread# even if they have async exceptions blocked.
+ */
+static __inline__ int
+interruptible(StgTSO *t)
+{
+ switch (t->why_blocked) {
+ case BlockedOnMVar:
+ case BlockedOnException:
+ case BlockedOnRead:
+ case BlockedOnWrite:
+#if defined(mingw32_TARGET_OS)
+ case BlockedOnDoProc:
+#endif
+ case BlockedOnDelay:
+ return 1;
+ default:
+ return 0;
+ }
+}