X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=rts%2FRtsAPI.c;h=2496af3ea08610a966ba0d0a171ff346efcbc3e6;hb=78260da4deee97a866ba83f8d73a8284b371f405;hp=716b4a2f2b028fb9c699f25df89bdd985cca7090;hpb=6015a94f9108a502150565577b66c23650796639;p=ghc-hetmet.git

diff --git a/rts/RtsAPI.c b/rts/RtsAPI.c
index 716b4a2..2496af3 100644
--- a/rts/RtsAPI.c
+++ b/rts/RtsAPI.c
@@ -491,6 +491,9 @@ rts_evalStableIO (Capability *cap, HsStablePtr s, /*out*/HsStablePtr *ret)
     
     p = (StgClosure *)deRefStablePtr(s);
     tso = createStrictIOThread(cap, RtsFlags.GcFlags.initialStkSize, p);
+    // async exceptions are always blocked by default in the created
+    // thread.  See #1048.
+    tso->flags |= TSO_BLOCKEX | TSO_INTERRUPTIBLE;
     cap = scheduleWaitThread(tso,&r,cap);
     stat = rts_getSchedStatus(cap);