+ /* Actually this is not necessary because R1 is about to be destroyed. */
+ LDV_ENTER(R1);
+
+#if defined(THREADED_RTS)
+ ACQUIRE_LOCK(sched_mutex "ptr");
+ // released in stg_block_blackhole_finally
+#endif
+
+ /* Put ourselves on the blackhole queue */
+ StgTSO__link(CurrentTSO) = W_[blackhole_queue];
+ W_[blackhole_queue] = CurrentTSO;
+
+ /* jot down why and on what closure we are blocked */
+ StgTSO_why_blocked(CurrentTSO) = BlockedOnBlackHole::I16;
+ StgTSO_block_info(CurrentTSO) = R1;
+
+ jump stg_block_blackhole;
+}
+