From adfe39e83768a9ac454149cd1541127cb85bf973 Mon Sep 17 00:00:00 2001
From: simonmar <unknown>
Date: Fri, 15 Feb 2002 14:53:32 +0000
Subject: [PATCH] [project @ 2002-02-15 14:53:32 by simonmar] Ensure that
 async exceptions are blocked during the raising of an async
 exception - we're about to block them anyway on entry to
 the handler, but we don't want any further exceptions being
 raised in the meantime.

---
 ghc/rts/Schedule.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/ghc/rts/Schedule.c b/ghc/rts/Schedule.c
index ba6920b..63e06fa 100644
--- a/ghc/rts/Schedule.c
+++ b/ghc/rts/Schedule.c
@@ -1,5 +1,5 @@
 /* ---------------------------------------------------------------------------
- * $Id: Schedule.c,v 1.125 2002/02/15 14:49:08 simonmar Exp $
+ * $Id: Schedule.c,v 1.126 2002/02/15 14:53:32 simonmar Exp $
  *
  * (c) The GHC Team, 1998-2000
  *
@@ -3090,6 +3090,14 @@ raiseAsync(StgTSO *tso, StgClosure *exception)
        */
       sp = (P_)su - 1;
 
+      /* Ensure that async excpetions are blocked now, so we don't get
+       * a surprise exception before we get around to executing the
+       * handler.
+       */
+      if (tso->blocked_exceptions == NULL) {
+	  tso->blocked_exceptions = END_TSO_QUEUE;
+      }
+
       /* Put the newly-built THUNK on top of the stack, ready to execute
        * when the thread restarts.
        */
-- 
1.7.10.4