systemc: Don't run the ready event inline when unpausing.

Now that delta events are handled explicitly by the scheduler, there's
no reason to run the readyEvent inline when returning from a pause. The
delta events will necessarily be run after the evaluate and update
phases.

Change-Id: Iad6d431a87742354e3a46a0fb44c309aa785ea60
Reviewed-on: https://gem5-review.googlesource.com/12214
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>

src/systemc/core/scheduler.cc

@@ -196,10 +196,8 @@ Scheduler::runReady()
         e->run();
     deltas.clear();
 
-    if (runOnce) {
-        eq->reschedule(&maxTickEvent, eq->getCurTick());
-        runOnce = false;
-    }
+    if (runOnce)
+        schedulePause();
 }
 
 void
@@ -220,14 +218,6 @@ Scheduler::pause()
     kernel->status(::sc_core::SC_PAUSED);
     runOnce = false;
     scMain->run();
-
-    // If the ready event is supposed to run now, run it inline so that it
-    // preempts any delta notifications which were scheduled while we were
-    // paused.
-    if (readyEvent.scheduled()) {
-        eq->deschedule(&readyEvent);
-        runReady();
-    }
 }
 
 void
@@ -298,13 +288,16 @@ Scheduler::scheduleStop(bool finish_delta)
 
     if (!finish_delta) {
         // If we're not supposed to finish the delta cycle, flush the list
-        // of ready processes and scheduled updates.
+        // of ready processes, scheduled updates, and delta notifications.
         Process *p;
         while ((p = readyList.getNext()))
             p->popListNode();
         Channel *c;
         while ((c = updateList.getNext()))
             c->popListNode();
+        for (auto &e: deltas)
+            e->deschedule();
+        deltas.clear();
     }
     eq->schedule(&stopEvent, eq->getCurTick());
 }