[project @ 2000-04-10 13:31:00 by simonmar]

[ghc-hetmet.git] / ghc / rts / Exception.h

diff --git a/ghc/rts/Exception.h b/ghc/rts/Exception.h
index 07203f9..251a957 100644 (file)
--- a/ghc/rts/Exception.h
+++ b/ghc/rts/Exception.h
@@ -1,5 +1,5 @@
 /* -----------------------------------------------------------------------------
- * $Id: Exception.h,v 1.1 1999/12/01 14:34:38 simonmar Exp $
+ * $Id: Exception.h,v 1.2 2000/03/17 10:24:44 simonmar Exp $
  *
  * (c) The GHC Team, 1998-1999
  *
@@ -9,3 +9,22 @@
 
 extern const StgInfoTable blockAsyncExceptionszh_ret_info;
 extern const StgInfoTable 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:
+  case BlockedOnDelay:
+    return 1;
+  default:
+    return 0;
+  }
+}