15d1cc806b
* Move kernel state from Horizon to KernelContext * Merge syscalls partial classes, split 32 and 64-bit variants * Sort usings
609 lines
18 KiB
C#
609 lines
18 KiB
C#
using Ryujinx.HLE.HOS.Kernel.Common;
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using Ryujinx.HLE.HOS.Kernel.Process;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading;
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namespace Ryujinx.HLE.HOS.Kernel.Threading
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{
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class KAddressArbiter
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{
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private const int HasListenersMask = 0x40000000;
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private readonly KernelContext _context;
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private readonly List<KThread> _condVarThreads;
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private readonly List<KThread> _arbiterThreads;
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public KAddressArbiter(KernelContext context)
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{
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_context = context;
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_condVarThreads = new List<KThread>();
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_arbiterThreads = new List<KThread>();
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}
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public KernelResult ArbitrateLock(int ownerHandle, ulong mutexAddress, int requesterHandle)
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{
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KThread currentThread = _context.Scheduler.GetCurrentThread();
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_context.CriticalSection.Enter();
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currentThread.SignaledObj = null;
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currentThread.ObjSyncResult = KernelResult.Success;
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KProcess currentProcess = _context.Scheduler.GetCurrentProcess();
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if (!KernelTransfer.UserToKernelInt32(_context, mutexAddress, out int mutexValue))
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{
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_context.CriticalSection.Leave();
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return KernelResult.InvalidMemState;
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}
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if (mutexValue != (ownerHandle | HasListenersMask))
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{
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_context.CriticalSection.Leave();
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return 0;
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}
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KThread mutexOwner = currentProcess.HandleTable.GetObject<KThread>(ownerHandle);
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if (mutexOwner == null)
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{
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_context.CriticalSection.Leave();
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return KernelResult.InvalidHandle;
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}
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currentThread.MutexAddress = mutexAddress;
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currentThread.ThreadHandleForUserMutex = requesterHandle;
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mutexOwner.AddMutexWaiter(currentThread);
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currentThread.Reschedule(ThreadSchedState.Paused);
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_context.CriticalSection.Leave();
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_context.CriticalSection.Enter();
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if (currentThread.MutexOwner != null)
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{
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currentThread.MutexOwner.RemoveMutexWaiter(currentThread);
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}
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_context.CriticalSection.Leave();
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return currentThread.ObjSyncResult;
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}
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public KernelResult ArbitrateUnlock(ulong mutexAddress)
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{
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_context.CriticalSection.Enter();
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KThread currentThread = _context.Scheduler.GetCurrentThread();
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(KernelResult result, KThread newOwnerThread) = MutexUnlock(currentThread, mutexAddress);
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if (result != KernelResult.Success && newOwnerThread != null)
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{
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newOwnerThread.SignaledObj = null;
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newOwnerThread.ObjSyncResult = result;
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}
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_context.CriticalSection.Leave();
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return result;
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}
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public KernelResult WaitProcessWideKeyAtomic(
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ulong mutexAddress,
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ulong condVarAddress,
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int threadHandle,
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long timeout)
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{
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_context.CriticalSection.Enter();
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KThread currentThread = _context.Scheduler.GetCurrentThread();
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currentThread.SignaledObj = null;
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currentThread.ObjSyncResult = KernelResult.TimedOut;
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if (currentThread.ShallBeTerminated ||
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currentThread.SchedFlags == ThreadSchedState.TerminationPending)
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{
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_context.CriticalSection.Leave();
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return KernelResult.ThreadTerminating;
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}
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(KernelResult result, _) = MutexUnlock(currentThread, mutexAddress);
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if (result != KernelResult.Success)
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{
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_context.CriticalSection.Leave();
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return result;
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}
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currentThread.MutexAddress = mutexAddress;
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currentThread.ThreadHandleForUserMutex = threadHandle;
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currentThread.CondVarAddress = condVarAddress;
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_condVarThreads.Add(currentThread);
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if (timeout != 0)
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{
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currentThread.Reschedule(ThreadSchedState.Paused);
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if (timeout > 0)
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{
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_context.TimeManager.ScheduleFutureInvocation(currentThread, timeout);
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}
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}
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_context.CriticalSection.Leave();
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if (timeout > 0)
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{
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_context.TimeManager.UnscheduleFutureInvocation(currentThread);
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}
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_context.CriticalSection.Enter();
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if (currentThread.MutexOwner != null)
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{
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currentThread.MutexOwner.RemoveMutexWaiter(currentThread);
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}
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_condVarThreads.Remove(currentThread);
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_context.CriticalSection.Leave();
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return currentThread.ObjSyncResult;
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}
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private (KernelResult, KThread) MutexUnlock(KThread currentThread, ulong mutexAddress)
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{
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KThread newOwnerThread = currentThread.RelinquishMutex(mutexAddress, out int count);
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int mutexValue = 0;
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if (newOwnerThread != null)
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{
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mutexValue = newOwnerThread.ThreadHandleForUserMutex;
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if (count >= 2)
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{
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mutexValue |= HasListenersMask;
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}
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newOwnerThread.SignaledObj = null;
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newOwnerThread.ObjSyncResult = KernelResult.Success;
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newOwnerThread.ReleaseAndResume();
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}
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KernelResult result = KernelResult.Success;
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if (!KernelTransfer.KernelToUserInt32(_context, mutexAddress, mutexValue))
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{
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result = KernelResult.InvalidMemState;
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}
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return (result, newOwnerThread);
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}
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public void SignalProcessWideKey(ulong address, int count)
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{
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Queue<KThread> signaledThreads = new Queue<KThread>();
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_context.CriticalSection.Enter();
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IOrderedEnumerable<KThread> sortedThreads = _condVarThreads.OrderBy(x => x.DynamicPriority);
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foreach (KThread thread in sortedThreads.Where(x => x.CondVarAddress == address))
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{
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TryAcquireMutex(thread);
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signaledThreads.Enqueue(thread);
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// If the count is <= 0, we should signal all threads waiting.
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if (count >= 1 && --count == 0)
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{
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break;
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}
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}
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while (signaledThreads.TryDequeue(out KThread thread))
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{
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_condVarThreads.Remove(thread);
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}
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_context.CriticalSection.Leave();
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}
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private KThread TryAcquireMutex(KThread requester)
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{
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ulong address = requester.MutexAddress;
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KProcess currentProcess = _context.Scheduler.GetCurrentProcess();
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if (!currentProcess.CpuMemory.IsMapped(address))
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{
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// Invalid address.
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requester.SignaledObj = null;
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requester.ObjSyncResult = KernelResult.InvalidMemState;
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return null;
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}
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ref int mutexRef = ref currentProcess.CpuMemory.GetRef<int>(address);
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int mutexValue, newMutexValue;
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do
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{
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mutexValue = mutexRef;
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if (mutexValue != 0)
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{
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// Update value to indicate there is a mutex waiter now.
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newMutexValue = mutexValue | HasListenersMask;
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}
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else
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{
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// No thread owning the mutex, assign to requesting thread.
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newMutexValue = requester.ThreadHandleForUserMutex;
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}
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}
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while (Interlocked.CompareExchange(ref mutexRef, newMutexValue, mutexValue) != mutexValue);
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if (mutexValue == 0)
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{
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// We now own the mutex.
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requester.SignaledObj = null;
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requester.ObjSyncResult = KernelResult.Success;
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requester.ReleaseAndResume();
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return null;
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}
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mutexValue &= ~HasListenersMask;
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KThread mutexOwner = currentProcess.HandleTable.GetObject<KThread>(mutexValue);
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if (mutexOwner != null)
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{
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// Mutex already belongs to another thread, wait for it.
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mutexOwner.AddMutexWaiter(requester);
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}
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else
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{
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// Invalid mutex owner.
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requester.SignaledObj = null;
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requester.ObjSyncResult = KernelResult.InvalidHandle;
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requester.ReleaseAndResume();
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}
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return mutexOwner;
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}
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public KernelResult WaitForAddressIfEqual(ulong address, int value, long timeout)
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{
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KThread currentThread = _context.Scheduler.GetCurrentThread();
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_context.CriticalSection.Enter();
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if (currentThread.ShallBeTerminated ||
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currentThread.SchedFlags == ThreadSchedState.TerminationPending)
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{
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_context.CriticalSection.Leave();
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return KernelResult.ThreadTerminating;
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}
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currentThread.SignaledObj = null;
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currentThread.ObjSyncResult = KernelResult.TimedOut;
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if (!KernelTransfer.UserToKernelInt32(_context, address, out int currentValue))
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{
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_context.CriticalSection.Leave();
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return KernelResult.InvalidMemState;
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}
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if (currentValue == value)
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{
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if (timeout == 0)
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{
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_context.CriticalSection.Leave();
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return KernelResult.TimedOut;
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}
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currentThread.MutexAddress = address;
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currentThread.WaitingInArbitration = true;
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InsertSortedByPriority(_arbiterThreads, currentThread);
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currentThread.Reschedule(ThreadSchedState.Paused);
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if (timeout > 0)
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{
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_context.TimeManager.ScheduleFutureInvocation(currentThread, timeout);
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}
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_context.CriticalSection.Leave();
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if (timeout > 0)
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{
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_context.TimeManager.UnscheduleFutureInvocation(currentThread);
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}
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_context.CriticalSection.Enter();
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if (currentThread.WaitingInArbitration)
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{
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_arbiterThreads.Remove(currentThread);
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currentThread.WaitingInArbitration = false;
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}
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_context.CriticalSection.Leave();
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return currentThread.ObjSyncResult;
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}
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_context.CriticalSection.Leave();
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return KernelResult.InvalidState;
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}
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public KernelResult WaitForAddressIfLessThan(
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ulong address,
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int value,
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bool shouldDecrement,
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long timeout)
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{
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KThread currentThread = _context.Scheduler.GetCurrentThread();
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_context.CriticalSection.Enter();
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if (currentThread.ShallBeTerminated ||
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currentThread.SchedFlags == ThreadSchedState.TerminationPending)
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{
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_context.CriticalSection.Leave();
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return KernelResult.ThreadTerminating;
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}
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currentThread.SignaledObj = null;
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currentThread.ObjSyncResult = KernelResult.TimedOut;
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KProcess currentProcess = _context.Scheduler.GetCurrentProcess();
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if (!KernelTransfer.UserToKernelInt32(_context, address, out int currentValue))
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{
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_context.CriticalSection.Leave();
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return KernelResult.InvalidMemState;
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}
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if (shouldDecrement)
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{
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currentValue = Interlocked.Decrement(ref currentProcess.CpuMemory.GetRef<int>(address)) + 1;
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}
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if (currentValue < value)
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{
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if (timeout == 0)
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{
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_context.CriticalSection.Leave();
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return KernelResult.TimedOut;
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}
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currentThread.MutexAddress = address;
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currentThread.WaitingInArbitration = true;
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InsertSortedByPriority(_arbiterThreads, currentThread);
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currentThread.Reschedule(ThreadSchedState.Paused);
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if (timeout > 0)
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{
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_context.TimeManager.ScheduleFutureInvocation(currentThread, timeout);
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}
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_context.CriticalSection.Leave();
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if (timeout > 0)
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{
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_context.TimeManager.UnscheduleFutureInvocation(currentThread);
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}
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_context.CriticalSection.Enter();
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if (currentThread.WaitingInArbitration)
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{
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_arbiterThreads.Remove(currentThread);
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currentThread.WaitingInArbitration = false;
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}
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_context.CriticalSection.Leave();
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return currentThread.ObjSyncResult;
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}
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_context.CriticalSection.Leave();
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return KernelResult.InvalidState;
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}
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private void InsertSortedByPriority(List<KThread> threads, KThread thread)
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{
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int nextIndex = -1;
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for (int index = 0; index < threads.Count; index++)
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{
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if (threads[index].DynamicPriority > thread.DynamicPriority)
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{
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nextIndex = index;
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break;
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}
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}
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if (nextIndex != -1)
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{
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threads.Insert(nextIndex, thread);
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}
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else
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{
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threads.Add(thread);
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}
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}
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public KernelResult Signal(ulong address, int count)
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{
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_context.CriticalSection.Enter();
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WakeArbiterThreads(address, count);
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_context.CriticalSection.Leave();
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return KernelResult.Success;
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}
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public KernelResult SignalAndIncrementIfEqual(ulong address, int value, int count)
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{
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_context.CriticalSection.Enter();
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KProcess currentProcess = _context.Scheduler.GetCurrentProcess();
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if (!currentProcess.CpuMemory.IsMapped(address))
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{
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_context.CriticalSection.Leave();
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return KernelResult.InvalidMemState;
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}
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ref int valueRef = ref currentProcess.CpuMemory.GetRef<int>(address);
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int currentValue;
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do
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{
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currentValue = valueRef;
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if (currentValue != value)
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{
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_context.CriticalSection.Leave();
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return KernelResult.InvalidState;
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}
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}
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while (Interlocked.CompareExchange(ref valueRef, currentValue + 1, currentValue) != currentValue);
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WakeArbiterThreads(address, count);
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_context.CriticalSection.Leave();
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return KernelResult.Success;
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}
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public KernelResult SignalAndModifyIfEqual(ulong address, int value, int count)
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{
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_context.CriticalSection.Enter();
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int offset;
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// The value is decremented if the number of threads waiting is less
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// or equal to the Count of threads to be signaled, or Count is zero
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// or negative. It is incremented if there are no threads waiting.
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int waitingCount = 0;
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foreach (KThread thread in _arbiterThreads.Where(x => x.MutexAddress == address))
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{
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if (++waitingCount > count)
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{
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break;
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}
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}
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if (waitingCount > 0)
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{
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offset = waitingCount <= count || count <= 0 ? -1 : 0;
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}
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else
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{
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offset = 1;
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}
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KProcess currentProcess = _context.Scheduler.GetCurrentProcess();
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if (!currentProcess.CpuMemory.IsMapped(address))
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{
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_context.CriticalSection.Leave();
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return KernelResult.InvalidMemState;
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}
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ref int valueRef = ref currentProcess.CpuMemory.GetRef<int>(address);
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int currentValue;
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do
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{
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currentValue = valueRef;
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if (currentValue != value)
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{
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_context.CriticalSection.Leave();
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return KernelResult.InvalidState;
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}
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}
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while (Interlocked.CompareExchange(ref valueRef, currentValue + offset, currentValue) != currentValue);
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WakeArbiterThreads(address, count);
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_context.CriticalSection.Leave();
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return KernelResult.Success;
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}
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private void WakeArbiterThreads(ulong address, int count)
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{
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Queue<KThread> signaledThreads = new Queue<KThread>();
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foreach (KThread thread in _arbiterThreads.Where(x => x.MutexAddress == address))
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{
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signaledThreads.Enqueue(thread);
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// If the count is <= 0, we should signal all threads waiting.
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if (count >= 1 && --count == 0)
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{
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break;
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}
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}
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while (signaledThreads.TryDequeue(out KThread thread))
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{
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thread.SignaledObj = null;
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thread.ObjSyncResult = KernelResult.Success;
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thread.ReleaseAndResume();
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thread.WaitingInArbitration = false;
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_arbiterThreads.Remove(thread);
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}
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}
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}
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}
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