Thread scheduler rewrite (#393)

* Started to rewrite the thread scheduler

* Add a single core-like scheduling mode, enabled by default

* Clear exclusive monitor on context switch

* Add SetThreadActivity, misc fixes

* Implement WaitForAddress and SignalToAddress svcs, misc fixes

* Misc fixes (on SetActivity and Arbiter), other tweaks

* Rebased

* Add missing null check

* Rename multicore key on config, fix UpdatePriorityInheritance

* Make scheduling data MLQs private

* nit: Ordering

ChocolArm64/State/AThreadState.cs

@@ -41,6 +41,9 @@ namespace ChocolArm64.State
         public bool Negative;
 
         public bool Running { get; set; }
+        public int  Core    { get; set; }
+
+        private bool Interrupted;
 
         public long TpidrEl0 { get; set; }
         public long Tpidr    { get; set; }
@@ -73,6 +76,7 @@ namespace ChocolArm64.State
             }
         }
 
+        public event EventHandler<EventArgs>               Interrupt;
         public event EventHandler<AInstExceptionEventArgs> Break;
         public event EventHandler<AInstExceptionEventArgs> SvcCall;
         public event EventHandler<AInstUndefinedEventArgs> Undefined;
@@ -99,9 +103,26 @@ namespace ChocolArm64.State
 
         internal bool Synchronize()
         {
+            if (Interrupted)
+            {
+                Interrupted = false;
+
+                OnInterrupt();
+            }
+
             return Running;
         }
 
+        internal void RequestInterrupt()
+        {
+            Interrupted = true;
+        }
+
+        private void OnInterrupt()
+        {
+            Interrupt?.Invoke(this, EventArgs.Empty);
+        }
+
         internal void OnBreak(long Position, int Imm)
         {
             Break?.Invoke(this, new AInstExceptionEventArgs(Position, Imm));