/* -----------------------------------------------------------------------------
- * $Id: Exception.h,v 1.1 1999/12/01 14:34:38 simonmar Exp $
*
- * (c) The GHC Team, 1998-1999
+ * (c) The GHC Team, 1998-2005
*
* Exception support
*
* ---------------------------------------------------------------------------*/
-extern const StgInfoTable blockAsyncExceptionszh_ret_info;
-extern const StgInfoTable unblockAsyncExceptionszh_ret_info;
+#ifndef EXCEPTION_H
+#define EXCEPTION_H
+
+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_HOST_OS)
+ case BlockedOnDoProc:
+#endif
+ case BlockedOnDelay:
+ return 1;
+ // NB. Threaded blocked on foreign calls (BlockedOnCCall) are
+ // *not* interruptible. We can't send these threads an exception.
+ default:
+ return 0;
+ }
+}
+
+#endif /* EXCEPTION_H */
+