Don't look at all the threads before each GC.

We were looking at all the threads for 2 reasons:
 1. to catch transactions that might be looping as a
    result of seeing an inconsistent view of memory.
 2. to catch threads with blocked exceptions that are
    themselves blocked.
For (1) we now check for this case whenever a thread yields, and for
(2) we catch these threads in the GC itself and send the exceptions
after GC (see performPendingThrowTos).

1 files changed, 1 insertions, 0 deletions

diff --git a/rts/Schedule.h b/rts/Schedule.h
index 89ac1125fa..59bdb9e999 100644
--- a/rts/Schedule.h
+++ b/rts/Schedule.h
@@ -154,6 +154,7 @@ void interruptStgRts (void);
 nat  run_queue_len (void);
 
 void resurrectThreads (StgTSO *);
+void performPendingThrowTos (StgTSO *);
 
 void printAllThreads(void);