Use message-passing to implement throwTo in the RTS

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

diff --git a/rts/Capability.h b/rts/Capability.h
index 35b9203..4030b5e 100644 (file)
--- a/rts/Capability.h
+++ b/rts/Capability.h
@@ -56,7 +56,7 @@ struct Capability_ {
     // the suspended TSOs easily.  Hence, when migrating a Task from
     // the returning_tasks list, we must also migrate its entry from
     // this list.
-    Task *suspended_ccalling_tasks;
+    InCall *suspended_ccalls;
 
     // One mutable list per generation, so we don't need to take any
     // locks when updating an old-generation thunk.  This also lets us
@@ -88,11 +88,8 @@ struct Capability_ {
     Task *returning_tasks_hd; // Singly-linked, with head/tail
     Task *returning_tasks_tl;
 
-    // A list of threads to append to this Capability's run queue at
-    // the earliest opportunity.  These are threads that have been
-    // woken up by another Capability.
-    StgTSO *wakeup_queue_hd;
-    StgTSO *wakeup_queue_tl;
+    // Messages, or END_TSO_QUEUE.
+    Message *inbox;
 
     SparkPool *sparks;
 
@@ -285,6 +282,18 @@ void markCapabilities (evac_fn evac, void *user);
 void traverseSparkQueues (evac_fn evac, void *user);
 
 /* -----------------------------------------------------------------------------
+   Messages
+   -------------------------------------------------------------------------- */
+
+#ifdef THREADED_RTS
+
+INLINE_HEADER rtsBool emptyInbox(Capability *cap);;
+
+void sendMessage (Capability *cap, Message *msg);
+
+#endif // THREADED_RTS
+
+/* -----------------------------------------------------------------------------
  * INLINE functions... private below here
  * -------------------------------------------------------------------------- */
 
@@ -294,7 +303,8 @@ recordMutableCap (StgClosure *p, Capability *cap, nat gen)
     bdescr *bd;
 
     // We must own this Capability in order to modify its mutable list.
-    ASSERT(cap->running_task == myTask());
+    //    ASSERT(cap->running_task == myTask());
+    // NO: assertion is violated by performPendingThrowTos()
     bd = cap->mut_lists[gen];
     if (bd->free >= bd->start + BLOCK_SIZE_W) {
        bdescr *new_bd;
@@ -332,6 +342,15 @@ contextSwitchCapability (Capability *cap)
     cap->context_switch = 1;
 }
 
+#ifdef THREADED_RTS
+
+INLINE_HEADER rtsBool emptyInbox(Capability *cap)
+{
+    return (cap->inbox == (Message*)END_TSO_QUEUE);
+}
+
+#endif
+
 END_RTS_PRIVATE
 
 #endif /* CAPABILITY_H */