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using System;
using System.Threading;
namespace Ryujinx.HLE.HOS.Kernel.Threading
{
partial class KScheduler
{
private const int RoundRobinTimeQuantumMs = 10;
private int _currentCore;
public bool MultiCoreScheduling { get; set; }
public HleCoreManager CoreManager { get; private set; }
private bool _keepPreempting;
public void StartAutoPreemptionThread()
{
Thread preemptionThread = new Thread(PreemptCurrentThread);
_keepPreempting = true;
preemptionThread.Start();
}
public void ContextSwitch()
{
lock (CoreContexts)
{
if (MultiCoreScheduling)
{
int selectedCount = 0;
for (int core = 0; core < CpuCoresCount; core++)
{
KCoreContext coreContext = CoreContexts[core];
if (coreContext.ContextSwitchNeeded && (coreContext.CurrentThread?.Context.IsCurrentThread() ?? false))
{
coreContext.ContextSwitch();
}
if (coreContext.CurrentThread?.Context.IsCurrentThread() ?? false)
{
selectedCount++;
}
}
if (selectedCount == 0)
{
CoreManager.Reset(Thread.CurrentThread);
}
else if (selectedCount == 1)
{
CoreManager.Set(Thread.CurrentThread);
}
else
{
throw new InvalidOperationException("Thread scheduled in more than one core!");
}
}
else
{
KThread currentThread = CoreContexts[_currentCore].CurrentThread;
bool hasThreadExecuting = currentThread != null;
if (hasThreadExecuting)
{
//If this is not the thread that is currently executing, we need
//to request an interrupt to allow safely starting another thread.
if (!currentThread.Context.IsCurrentThread())
{
currentThread.Context.RequestInterrupt();
return;
}
CoreManager.Reset(currentThread.Context.Work);
}
//Advance current core and try picking a thread,
//keep advancing if it is null.
for (int core = 0; core < 4; core++)
{
_currentCore = (_currentCore + 1) % CpuCoresCount;
KCoreContext coreContext = CoreContexts[_currentCore];
coreContext.UpdateCurrentThread();
if (coreContext.CurrentThread != null)
{
CoreManager.Set(coreContext.CurrentThread.Context.Work);
coreContext.CurrentThread.Context.Execute();
break;
}
}
//If nothing was running before, then we are on a "external"
//HLE thread, we don't need to wait.
if (!hasThreadExecuting)
{
return;
}
}
}
CoreManager.Wait(Thread.CurrentThread);
}
private void PreemptCurrentThread()
{
//Preempts current thread every 10 milliseconds on a round-robin fashion,
//when multi core scheduling is disabled, to try ensuring that all threads
//gets a chance to run.
while (_keepPreempting)
{
lock (CoreContexts)
{
KThread currentThread = CoreContexts[_currentCore].CurrentThread;
currentThread?.Context.RequestInterrupt();
}
PreemptThreads();
Thread.Sleep(RoundRobinTimeQuantumMs);
}
}
public void ExitThread(KThread thread)
{
thread.Context.StopExecution();
CoreManager.Exit(thread.Context.Work);
}
public void RemoveThread(KThread thread)
{
CoreManager.RemoveThread(thread.Context.Work);
}
}
}
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