Ryujinx/Ryujinx.HLE/HOS/Kernel/KThread.cs

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2018-02-04 23:08:20 +00:00
using ChocolArm64;
using ChocolArm64.Memory;
using System;
using System.Collections.Generic;
using System.Linq;
using static Ryujinx.HLE.HOS.ErrorCode;
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namespace Ryujinx.HLE.HOS.Kernel
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{
class KThread : KSynchronizationObject, IKFutureSchedulerObject
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{
public CpuThread Context { get; private set; }
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public long AffinityMask { get; set; }
public long ThreadUid { get; private set; }
public long TotalTimeRunning { get; set; }
public KSynchronizationObject SignaledObj { get; set; }
public long CondVarAddress { get; set; }
private ulong _entrypoint;
public long MutexAddress { get; set; }
public KProcess Owner { get; private set; }
private ulong _tlsAddress;
public long LastScheduledTime { get; set; }
public LinkedListNode<KThread>[] SiblingsPerCore { get; private set; }
public LinkedList<KThread> Withholder { get; set; }
public LinkedListNode<KThread> WithholderNode { get; set; }
public LinkedListNode<KThread> ProcessListNode { get; set; }
private LinkedList<KThread> _mutexWaiters;
private LinkedListNode<KThread> _mutexWaiterNode;
public KThread MutexOwner { get; private set; }
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public int ThreadHandleForUserMutex { get; set; }
private ThreadSchedState _forcePauseFlags;
public int ObjSyncResult { get; set; }
public int DynamicPriority { get; set; }
public int CurrentCore { get; set; }
public int BasePriority { get; set; }
public int PreferredCore { get; set; }
private long _affinityMaskOverride;
private int _preferredCoreOverride;
private int _affinityOverrideCount;
public ThreadSchedState SchedFlags { get; private set; }
public bool ShallBeTerminated { get; private set; }
public bool SyncCancelled { get; set; }
public bool WaitingSync { get; set; }
private bool _hasExited;
public bool WaitingInArbitration { get; set; }
private KScheduler _scheduler;
private KSchedulingData _schedulingData;
public long LastPc { get; set; }
public KThread(Horizon system) : base(system)
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{
_scheduler = system.Scheduler;
_schedulingData = system.Scheduler.SchedulingData;
SiblingsPerCore = new LinkedListNode<KThread>[KScheduler.CpuCoresCount];
_mutexWaiters = new LinkedList<KThread>();
}
public KernelResult Initialize(
ulong entrypoint,
ulong argsPtr,
ulong stackTop,
int priority,
int defaultCpuCore,
KProcess owner,
ThreadType type = ThreadType.User)
{
if ((uint)type > 3)
{
throw new ArgumentException($"Invalid thread type \"{type}\".");
}
PreferredCore = defaultCpuCore;
AffinityMask |= 1L << defaultCpuCore;
SchedFlags = type == ThreadType.Dummy
? ThreadSchedState.Running
: ThreadSchedState.None;
CurrentCore = PreferredCore;
DynamicPriority = priority;
BasePriority = priority;
ObjSyncResult = 0x7201;
_entrypoint = entrypoint;
if (type == ThreadType.User)
{
if (owner.AllocateThreadLocalStorage(out _tlsAddress) != KernelResult.Success)
{
return KernelResult.OutOfMemory;
}
MemoryHelper.FillWithZeros(owner.CpuMemory, (long)_tlsAddress, KTlsPageInfo.TlsEntrySize);
}
bool is64Bits;
if (owner != null)
{
Owner = owner;
owner.IncrementThreadCount();
is64Bits = (owner.MmuFlags & 1) != 0;
}
else
{
is64Bits = true;
}
Context = new CpuThread(owner.Translator, owner.CpuMemory, (long)entrypoint);
Context.ThreadState.X0 = argsPtr;
Context.ThreadState.X31 = stackTop;
Context.ThreadState.CntfrqEl0 = 19200000;
Context.ThreadState.Tpidr = (long)_tlsAddress;
owner.SubscribeThreadEventHandlers(Context);
Context.WorkFinished += ThreadFinishedHandler;
ThreadUid = System.GetThreadUid();
if (owner != null)
{
owner.AddThread(this);
if (owner.IsPaused)
{
System.CriticalSection.Enter();
if (ShallBeTerminated || SchedFlags == ThreadSchedState.TerminationPending)
{
System.CriticalSection.Leave();
return KernelResult.Success;
}
_forcePauseFlags |= ThreadSchedState.ProcessPauseFlag;
CombineForcePauseFlags();
System.CriticalSection.Leave();
}
}
return KernelResult.Success;
}
public KernelResult Start()
{
if (!System.KernelInitialized)
{
System.CriticalSection.Enter();
if (!ShallBeTerminated && SchedFlags != ThreadSchedState.TerminationPending)
{
_forcePauseFlags |= ThreadSchedState.KernelInitPauseFlag;
CombineForcePauseFlags();
}
System.CriticalSection.Leave();
}
KernelResult result = KernelResult.ThreadTerminating;
System.CriticalSection.Enter();
if (!ShallBeTerminated)
{
KThread currentThread = System.Scheduler.GetCurrentThread();
while (SchedFlags != ThreadSchedState.TerminationPending &&
currentThread.SchedFlags != ThreadSchedState.TerminationPending &&
!currentThread.ShallBeTerminated)
{
if ((SchedFlags & ThreadSchedState.LowMask) != ThreadSchedState.None)
{
result = KernelResult.InvalidState;
break;
}
if (currentThread._forcePauseFlags == ThreadSchedState.None)
{
if (Owner != null && _forcePauseFlags != ThreadSchedState.None)
{
CombineForcePauseFlags();
}
SetNewSchedFlags(ThreadSchedState.Running);
result = KernelResult.Success;
break;
}
else
{
currentThread.CombineForcePauseFlags();
System.CriticalSection.Leave();
System.CriticalSection.Enter();
if (currentThread.ShallBeTerminated)
{
break;
}
}
}
}
System.CriticalSection.Leave();
return result;
}
public void Exit()
{
System.CriticalSection.Enter();
_forcePauseFlags &= ~ThreadSchedState.ForcePauseMask;
ExitImpl();
System.CriticalSection.Leave();
}
private void ExitImpl()
{
System.CriticalSection.Enter();
SetNewSchedFlags(ThreadSchedState.TerminationPending);
_hasExited = true;
Signal();
System.CriticalSection.Leave();
}
public long Sleep(long timeout)
{
System.CriticalSection.Enter();
if (ShallBeTerminated || SchedFlags == ThreadSchedState.TerminationPending)
{
System.CriticalSection.Leave();
return MakeError(ErrorModule.Kernel, KernelErr.ThreadTerminating);
}
SetNewSchedFlags(ThreadSchedState.Paused);
if (timeout > 0)
{
System.TimeManager.ScheduleFutureInvocation(this, timeout);
}
System.CriticalSection.Leave();
if (timeout > 0)
{
System.TimeManager.UnscheduleFutureInvocation(this);
}
return 0;
}
public void Yield()
{
System.CriticalSection.Enter();
if (SchedFlags != ThreadSchedState.Running)
{
System.CriticalSection.Leave();
System.Scheduler.ContextSwitch();
return;
}
if (DynamicPriority < KScheduler.PrioritiesCount)
{
//Move current thread to the end of the queue.
_schedulingData.Reschedule(DynamicPriority, CurrentCore, this);
}
_scheduler.ThreadReselectionRequested = true;
System.CriticalSection.Leave();
System.Scheduler.ContextSwitch();
}
public void YieldWithLoadBalancing()
{
System.CriticalSection.Enter();
if (SchedFlags != ThreadSchedState.Running)
{
System.CriticalSection.Leave();
System.Scheduler.ContextSwitch();
return;
}
int prio = DynamicPriority;
int core = CurrentCore;
KThread nextThreadOnCurrentQueue = null;
if (DynamicPriority < KScheduler.PrioritiesCount)
{
//Move current thread to the end of the queue.
_schedulingData.Reschedule(prio, core, this);
Func<KThread, bool> predicate = x => x.DynamicPriority == prio;
nextThreadOnCurrentQueue = _schedulingData.ScheduledThreads(core).FirstOrDefault(predicate);
}
IEnumerable<KThread> SuitableCandidates()
{
foreach (KThread thread in _schedulingData.SuggestedThreads(core))
{
int srcCore = thread.CurrentCore;
if (srcCore >= 0)
{
KThread selectedSrcCore = _scheduler.CoreContexts[srcCore].SelectedThread;
if (selectedSrcCore == thread || ((selectedSrcCore?.DynamicPriority ?? 2) < 2))
{
continue;
}
}
//If the candidate was scheduled after the current thread, then it's not worth it,
//unless the priority is higher than the current one.
if (nextThreadOnCurrentQueue.LastScheduledTime >= thread.LastScheduledTime ||
nextThreadOnCurrentQueue.DynamicPriority < thread.DynamicPriority)
{
yield return thread;
}
}
}
KThread dst = SuitableCandidates().FirstOrDefault(x => x.DynamicPriority <= prio);
if (dst != null)
{
_schedulingData.TransferToCore(dst.DynamicPriority, core, dst);
_scheduler.ThreadReselectionRequested = true;
}
if (this != nextThreadOnCurrentQueue)
{
_scheduler.ThreadReselectionRequested = true;
}
System.CriticalSection.Leave();
System.Scheduler.ContextSwitch();
}
public void YieldAndWaitForLoadBalancing()
{
System.CriticalSection.Enter();
if (SchedFlags != ThreadSchedState.Running)
{
System.CriticalSection.Leave();
System.Scheduler.ContextSwitch();
return;
}
int core = CurrentCore;
_schedulingData.TransferToCore(DynamicPriority, -1, this);
KThread selectedThread = null;
if (!_schedulingData.ScheduledThreads(core).Any())
{
foreach (KThread thread in _schedulingData.SuggestedThreads(core))
{
if (thread.CurrentCore < 0)
{
continue;
}
KThread firstCandidate = _schedulingData.ScheduledThreads(thread.CurrentCore).FirstOrDefault();
if (firstCandidate == thread)
{
continue;
}
if (firstCandidate == null || firstCandidate.DynamicPriority >= 2)
{
_schedulingData.TransferToCore(thread.DynamicPriority, core, thread);
selectedThread = thread;
}
break;
}
}
if (selectedThread != this)
{
_scheduler.ThreadReselectionRequested = true;
}
System.CriticalSection.Leave();
System.Scheduler.ContextSwitch();
}
public void SetPriority(int priority)
{
System.CriticalSection.Enter();
BasePriority = priority;
UpdatePriorityInheritance();
System.CriticalSection.Leave();
}
public long SetActivity(bool pause)
{
long result = 0;
System.CriticalSection.Enter();
ThreadSchedState lowNibble = SchedFlags & ThreadSchedState.LowMask;
if (lowNibble != ThreadSchedState.Paused && lowNibble != ThreadSchedState.Running)
{
System.CriticalSection.Leave();
return MakeError(ErrorModule.Kernel, KernelErr.InvalidState);
}
System.CriticalSection.Enter();
if (!ShallBeTerminated && SchedFlags != ThreadSchedState.TerminationPending)
{
if (pause)
{
//Pause, the force pause flag should be clear (thread is NOT paused).
if ((_forcePauseFlags & ThreadSchedState.ThreadPauseFlag) == 0)
{
_forcePauseFlags |= ThreadSchedState.ThreadPauseFlag;
CombineForcePauseFlags();
}
else
{
result = MakeError(ErrorModule.Kernel, KernelErr.InvalidState);
}
}
else
{
//Unpause, the force pause flag should be set (thread is paused).
if ((_forcePauseFlags & ThreadSchedState.ThreadPauseFlag) != 0)
{
ThreadSchedState oldForcePauseFlags = _forcePauseFlags;
_forcePauseFlags &= ~ThreadSchedState.ThreadPauseFlag;
if ((oldForcePauseFlags & ~ThreadSchedState.ThreadPauseFlag) == ThreadSchedState.None)
{
ThreadSchedState oldSchedFlags = SchedFlags;
SchedFlags &= ThreadSchedState.LowMask;
AdjustScheduling(oldSchedFlags);
}
}
else
{
result = MakeError(ErrorModule.Kernel, KernelErr.InvalidState);
}
}
}
System.CriticalSection.Leave();
System.CriticalSection.Leave();
return result;
}
public void CancelSynchronization()
{
System.CriticalSection.Enter();
if ((SchedFlags & ThreadSchedState.LowMask) != ThreadSchedState.Paused || !WaitingSync)
{
SyncCancelled = true;
}
else if (Withholder != null)
{
Withholder.Remove(WithholderNode);
SetNewSchedFlags(ThreadSchedState.Running);
Withholder = null;
SyncCancelled = true;
}
else
{
SignaledObj = null;
ObjSyncResult = (int)MakeError(ErrorModule.Kernel, KernelErr.Cancelled);
SetNewSchedFlags(ThreadSchedState.Running);
SyncCancelled = false;
}
System.CriticalSection.Leave();
}
public KernelResult SetCoreAndAffinityMask(int newCore, long newAffinityMask)
{
System.CriticalSection.Enter();
bool useOverride = _affinityOverrideCount != 0;
//The value -3 is "do not change the preferred core".
if (newCore == -3)
{
newCore = useOverride ? _preferredCoreOverride : PreferredCore;
if ((newAffinityMask & (1 << newCore)) == 0)
{
System.CriticalSection.Leave();
return KernelResult.InvalidCombination;
}
}
if (useOverride)
{
_preferredCoreOverride = newCore;
_affinityMaskOverride = newAffinityMask;
}
else
{
long oldAffinityMask = AffinityMask;
PreferredCore = newCore;
AffinityMask = newAffinityMask;
if (oldAffinityMask != newAffinityMask)
{
int oldCore = CurrentCore;
if (CurrentCore >= 0 && ((AffinityMask >> CurrentCore) & 1) == 0)
{
if (PreferredCore < 0)
{
CurrentCore = HighestSetCore(AffinityMask);
}
else
{
CurrentCore = PreferredCore;
}
}
AdjustSchedulingForNewAffinity(oldAffinityMask, oldCore);
}
}
System.CriticalSection.Leave();
return KernelResult.Success;
}
private static int HighestSetCore(long mask)
{
for (int core = KScheduler.CpuCoresCount - 1; core >= 0; core--)
{
if (((mask >> core) & 1) != 0)
{
return core;
}
}
return -1;
}
private void CombineForcePauseFlags()
{
ThreadSchedState oldFlags = SchedFlags;
ThreadSchedState lowNibble = SchedFlags & ThreadSchedState.LowMask;
SchedFlags = lowNibble | _forcePauseFlags;
AdjustScheduling(oldFlags);
}
private void SetNewSchedFlags(ThreadSchedState newFlags)
{
System.CriticalSection.Enter();
ThreadSchedState oldFlags = SchedFlags;
SchedFlags = (oldFlags & ThreadSchedState.HighMask) | newFlags;
if ((oldFlags & ThreadSchedState.LowMask) != newFlags)
{
AdjustScheduling(oldFlags);
}
System.CriticalSection.Leave();
}
public void ReleaseAndResume()
{
System.CriticalSection.Enter();
if ((SchedFlags & ThreadSchedState.LowMask) == ThreadSchedState.Paused)
{
if (Withholder != null)
{
Withholder.Remove(WithholderNode);
SetNewSchedFlags(ThreadSchedState.Running);
Withholder = null;
}
else
{
SetNewSchedFlags(ThreadSchedState.Running);
}
}
System.CriticalSection.Leave();
}
public void Reschedule(ThreadSchedState newFlags)
{
System.CriticalSection.Enter();
ThreadSchedState oldFlags = SchedFlags;
SchedFlags = (oldFlags & ThreadSchedState.HighMask) |
(newFlags & ThreadSchedState.LowMask);
AdjustScheduling(oldFlags);
System.CriticalSection.Leave();
}
public void AddMutexWaiter(KThread requester)
{
AddToMutexWaitersList(requester);
requester.MutexOwner = this;
UpdatePriorityInheritance();
}
public void RemoveMutexWaiter(KThread thread)
{
if (thread._mutexWaiterNode?.List != null)
{
_mutexWaiters.Remove(thread._mutexWaiterNode);
}
thread.MutexOwner = null;
UpdatePriorityInheritance();
}
public KThread RelinquishMutex(long mutexAddress, out int count)
{
count = 0;
if (_mutexWaiters.First == null)
{
return null;
}
KThread newMutexOwner = null;
LinkedListNode<KThread> currentNode = _mutexWaiters.First;
do
{
//Skip all threads that are not waiting for this mutex.
while (currentNode != null && currentNode.Value.MutexAddress != mutexAddress)
{
currentNode = currentNode.Next;
}
if (currentNode == null)
{
break;
}
LinkedListNode<KThread> nextNode = currentNode.Next;
_mutexWaiters.Remove(currentNode);
currentNode.Value.MutexOwner = newMutexOwner;
if (newMutexOwner != null)
{
//New owner was already selected, re-insert on new owner list.
newMutexOwner.AddToMutexWaitersList(currentNode.Value);
}
else
{
//New owner not selected yet, use current thread.
newMutexOwner = currentNode.Value;
}
count++;
currentNode = nextNode;
}
while (currentNode != null);
if (newMutexOwner != null)
{
UpdatePriorityInheritance();
newMutexOwner.UpdatePriorityInheritance();
}
return newMutexOwner;
}
private void UpdatePriorityInheritance()
{
//If any of the threads waiting for the mutex has
//higher priority than the current thread, then
//the current thread inherits that priority.
int highestPriority = BasePriority;
if (_mutexWaiters.First != null)
{
int waitingDynamicPriority = _mutexWaiters.First.Value.DynamicPriority;
if (waitingDynamicPriority < highestPriority)
{
highestPriority = waitingDynamicPriority;
}
}
if (highestPriority != DynamicPriority)
{
int oldPriority = DynamicPriority;
DynamicPriority = highestPriority;
AdjustSchedulingForNewPriority(oldPriority);
if (MutexOwner != null)
{
//Remove and re-insert to ensure proper sorting based on new priority.
MutexOwner._mutexWaiters.Remove(_mutexWaiterNode);
MutexOwner.AddToMutexWaitersList(this);
MutexOwner.UpdatePriorityInheritance();
}
}
}
private void AddToMutexWaitersList(KThread thread)
{
LinkedListNode<KThread> nextPrio = _mutexWaiters.First;
int currentPriority = thread.DynamicPriority;
while (nextPrio != null && nextPrio.Value.DynamicPriority <= currentPriority)
{
nextPrio = nextPrio.Next;
}
if (nextPrio != null)
{
thread._mutexWaiterNode = _mutexWaiters.AddBefore(nextPrio, thread);
}
else
{
thread._mutexWaiterNode = _mutexWaiters.AddLast(thread);
}
}
private void AdjustScheduling(ThreadSchedState oldFlags)
{
if (oldFlags == SchedFlags)
{
return;
}
if (oldFlags == ThreadSchedState.Running)
{
//Was running, now it's stopped.
if (CurrentCore >= 0)
{
_schedulingData.Unschedule(DynamicPriority, CurrentCore, this);
}
for (int core = 0; core < KScheduler.CpuCoresCount; core++)
{
if (core != CurrentCore && ((AffinityMask >> core) & 1) != 0)
{
_schedulingData.Unsuggest(DynamicPriority, core, this);
}
}
}
else if (SchedFlags == ThreadSchedState.Running)
{
//Was stopped, now it's running.
if (CurrentCore >= 0)
{
_schedulingData.Schedule(DynamicPriority, CurrentCore, this);
}
for (int core = 0; core < KScheduler.CpuCoresCount; core++)
{
if (core != CurrentCore && ((AffinityMask >> core) & 1) != 0)
{
_schedulingData.Suggest(DynamicPriority, core, this);
}
}
}
_scheduler.ThreadReselectionRequested = true;
}
private void AdjustSchedulingForNewPriority(int oldPriority)
{
if (SchedFlags != ThreadSchedState.Running)
{
return;
}
//Remove thread from the old priority queues.
if (CurrentCore >= 0)
{
_schedulingData.Unschedule(oldPriority, CurrentCore, this);
}
for (int core = 0; core < KScheduler.CpuCoresCount; core++)
{
if (core != CurrentCore && ((AffinityMask >> core) & 1) != 0)
{
_schedulingData.Unsuggest(oldPriority, core, this);
}
}
//Add thread to the new priority queues.
KThread currentThread = _scheduler.GetCurrentThread();
if (CurrentCore >= 0)
{
if (currentThread == this)
{
_schedulingData.SchedulePrepend(DynamicPriority, CurrentCore, this);
}
else
{
_schedulingData.Schedule(DynamicPriority, CurrentCore, this);
}
}
for (int core = 0; core < KScheduler.CpuCoresCount; core++)
{
if (core != CurrentCore && ((AffinityMask >> core) & 1) != 0)
{
_schedulingData.Suggest(DynamicPriority, core, this);
}
}
_scheduler.ThreadReselectionRequested = true;
}
private void AdjustSchedulingForNewAffinity(long oldAffinityMask, int oldCore)
{
if (SchedFlags != ThreadSchedState.Running || DynamicPriority >= KScheduler.PrioritiesCount)
{
return;
}
//Remove from old queues.
for (int core = 0; core < KScheduler.CpuCoresCount; core++)
{
if (((oldAffinityMask >> core) & 1) != 0)
{
if (core == oldCore)
{
_schedulingData.Unschedule(DynamicPriority, core, this);
}
else
{
_schedulingData.Unsuggest(DynamicPriority, core, this);
}
}
}
//Insert on new queues.
for (int core = 0; core < KScheduler.CpuCoresCount; core++)
{
if (((AffinityMask >> core) & 1) != 0)
{
if (core == CurrentCore)
{
_schedulingData.Schedule(DynamicPriority, core, this);
}
else
{
_schedulingData.Suggest(DynamicPriority, core, this);
}
}
}
_scheduler.ThreadReselectionRequested = true;
}
public override bool IsSignaled()
{
return _hasExited;
}
public void SetEntryArguments(long argsPtr, int threadHandle)
{
Context.ThreadState.X0 = (ulong)argsPtr;
Context.ThreadState.X1 = (ulong)threadHandle;
}
public void ClearExclusive()
{
Owner.CpuMemory.ClearExclusive(CurrentCore);
}
public void TimeUp()
{
ReleaseAndResume();
}
public void PrintGuestStackTrace()
{
Owner.Debugger.PrintGuestStackTrace(Context.ThreadState);
}
private void ThreadFinishedHandler(object sender, EventArgs e)
{
System.Scheduler.ExitThread(this);
Terminate();
System.Scheduler.RemoveThread(this);
}
public void Terminate()
{
Owner?.RemoveThread(this);
if (_tlsAddress != 0 && Owner.FreeThreadLocalStorage(_tlsAddress) != KernelResult.Success)
{
throw new InvalidOperationException("Unexpected failure freeing thread local storage.");
}
System.CriticalSection.Enter();
//Wake up all threads that may be waiting for a mutex being held
//by this thread.
foreach (KThread thread in _mutexWaiters)
{
thread.MutexOwner = null;
thread._preferredCoreOverride = 0;
thread.ObjSyncResult = 0xfa01;
thread.ReleaseAndResume();
}
System.CriticalSection.Leave();
Owner?.DecrementThreadCountAndTerminateIfZero();
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}
}
}