From 48278905d1470f89be31668c738397f569af156a Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Wed, 9 Dec 2020 19:20:05 -0300
Subject: Rewrite scheduler context switch code (#1786)

* Rewrite scheduler context switch code

* Fix race in UnmapIpcRestorePermission

* Fix thread exit issue that could leave the scheduler in a invalid state

* Change context switch method to not wait on guest thread, remove spin wait, use SignalAndWait to pass control

* Remove multi-core setting (it is always on now)

* Re-enable assert

* Remove multicore from default config and schema

* Fix race in KTimeManager
---
 Ryujinx.HLE/HOS/Kernel/KernelContext.cs | 39 ++++++++++++++++++++++++++++-----
 1 file changed, 34 insertions(+), 5 deletions(-)

(limited to 'Ryujinx.HLE/HOS/Kernel/KernelContext.cs')

diff --git a/Ryujinx.HLE/HOS/Kernel/KernelContext.cs b/Ryujinx.HLE/HOS/Kernel/KernelContext.cs
index d19c43ee..cacb7fb3 100644
--- a/Ryujinx.HLE/HOS/Kernel/KernelContext.cs
+++ b/Ryujinx.HLE/HOS/Kernel/KernelContext.cs
@@ -19,6 +19,8 @@ namespace Ryujinx.HLE.HOS.Kernel
 
         public bool KernelInitialized { get; }
 
+        public bool Running { get; private set; }
+
         public Switch Device { get; }
         public MemoryBlock Memory { get; }
         public Syscall Syscall { get; }
@@ -34,7 +36,8 @@ namespace Ryujinx.HLE.HOS.Kernel
         public KSlabHeap UserSlabHeapPages { get; }
 
         public KCriticalSection CriticalSection { get; }
-        public KScheduler Scheduler { get; }
+        public KScheduler[] Schedulers { get; }
+        public KPriorityQueue PriorityQueue { get; }
         public KTimeManager TimeManager { get; }
         public KSynchronization Synchronization { get; }
         public KContextIdManager ContextIdManager { get; }
@@ -42,6 +45,8 @@ namespace Ryujinx.HLE.HOS.Kernel
         public ConcurrentDictionary<long, KProcess> Processes { get; }
         public ConcurrentDictionary<string, KAutoObject> AutoObjectNames { get; }
 
+        public bool ThreadReselectionRequested { get; set; }
+
         private long _kipId;
         private long _processId;
         private long _threadUid;
@@ -51,6 +56,8 @@ namespace Ryujinx.HLE.HOS.Kernel
             Device = device;
             Memory = memory;
 
+            Running = true;
+
             Syscall = new Syscall(this);
 
             SyscallHandler = new SyscallHandler(this);
@@ -70,12 +77,18 @@ namespace Ryujinx.HLE.HOS.Kernel
                 KernelConstants.UserSlabHeapSize);
 
             CriticalSection = new KCriticalSection(this);
-            Scheduler = new KScheduler(this);
-            TimeManager = new KTimeManager();
+            Schedulers = new KScheduler[KScheduler.CpuCoresCount];
+            PriorityQueue = new KPriorityQueue();
+            TimeManager = new KTimeManager(this);
             Synchronization = new KSynchronization(this);
             ContextIdManager = new KContextIdManager();
 
-            Scheduler.StartAutoPreemptionThread();
+            for (int core = 0; core < KScheduler.CpuCoresCount; core++)
+            {
+                Schedulers[core] = new KScheduler(this, core);
+            }
+
+            StartPreemptionThread();
 
             KernelInitialized = true;
 
@@ -86,6 +99,16 @@ namespace Ryujinx.HLE.HOS.Kernel
             _processId = KernelConstants.InitialProcessId;
         }
 
+        private void StartPreemptionThread()
+        {
+            void PreemptionThreadStart()
+            {
+                KScheduler.PreemptionThreadLoop(this);
+            }
+
+            new Thread(PreemptionThreadStart) { Name = "HLE.PreemptionThread" }.Start();
+        }
+
         public long NewThreadUid()
         {
             return Interlocked.Increment(ref _threadUid) - 1;
@@ -103,7 +126,13 @@ namespace Ryujinx.HLE.HOS.Kernel
 
         public void Dispose()
         {
-            Scheduler.Dispose();
+            Running = false;
+
+            for (int i = 0; i < KScheduler.CpuCoresCount; i++)
+            {
+                Schedulers[i].Dispose();
+            }
+
             TimeManager.Dispose();
         }
     }
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