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using System;
namespace Ryujinx.HLE.HOS.Kernel
{
class KProcessHandleTable
{
private const int SelfThreadHandle = (0x1ffff << 15) | 0;
private const int SelfProcessHandle = (0x1ffff << 15) | 1;
private Horizon System;
private KHandleEntry[] Table;
private KHandleEntry TableHead;
private KHandleEntry NextFreeEntry;
private int ActiveSlotsCount;
private int Size;
private ushort IdCounter;
private object LockObj;
public KProcessHandleTable(Horizon System, int Size = 1024)
{
this.System = System;
this.Size = Size;
IdCounter = 1;
Table = new KHandleEntry[Size];
TableHead = new KHandleEntry(0);
KHandleEntry Entry = TableHead;
for (int Index = 0; Index < Size; Index++)
{
Table[Index] = Entry;
Entry.Next = new KHandleEntry(Index + 1);
Entry = Entry.Next;
}
Table[Size - 1].Next = null;
NextFreeEntry = TableHead;
LockObj = new object();
}
public KernelResult GenerateHandle(object Obj, out int Handle)
{
Handle = 0;
lock (LockObj)
{
if (ActiveSlotsCount >= Size)
{
return KernelResult.HandleTableFull;
}
KHandleEntry Entry = NextFreeEntry;
NextFreeEntry = Entry.Next;
Entry.Obj = Obj;
Entry.HandleId = IdCounter;
ActiveSlotsCount++;
Handle = (int)((IdCounter << 15) & (uint)0xffff8000) | Entry.Index;
if ((short)(IdCounter + 1) >= 0)
{
IdCounter++;
}
else
{
IdCounter = 1;
}
}
return KernelResult.Success;
}
public bool CloseHandle(int Handle)
{
if ((Handle >> 30) != 0 ||
Handle == SelfThreadHandle ||
Handle == SelfProcessHandle)
{
return false;
}
int Index = (Handle >> 0) & 0x7fff;
int HandleId = (Handle >> 15);
bool Result = false;
lock (LockObj)
{
if (HandleId != 0 && Index < Size)
{
KHandleEntry Entry = Table[Index];
if (Entry.Obj != null && Entry.HandleId == HandleId)
{
Entry.Obj = null;
Entry.Next = NextFreeEntry;
NextFreeEntry = Entry;
ActiveSlotsCount--;
Result = true;
}
}
}
return Result;
}
public T GetObject<T>(int Handle)
{
int Index = (Handle >> 0) & 0x7fff;
int HandleId = (Handle >> 15);
lock (LockObj)
{
if ((Handle >> 30) == 0 && HandleId != 0)
{
KHandleEntry Entry = Table[Index];
if (Entry.HandleId == HandleId && Entry.Obj is T Obj)
{
return Obj;
}
}
}
return default(T);
}
public KThread GetKThread(int Handle)
{
if (Handle == SelfThreadHandle)
{
return System.Scheduler.GetCurrentThread();
}
else
{
return GetObject<KThread>(Handle);
}
}
public void Destroy()
{
lock (LockObj)
{
for (int Index = 0; Index < Size; Index++)
{
KHandleEntry Entry = Table[Index];
if (Entry.Obj != null)
{
if (Entry.Obj is IDisposable DisposableObj)
{
DisposableObj.Dispose();
}
Entry.Obj = null;
Entry.Next = NextFreeEntry;
NextFreeEntry = Entry;
}
}
}
}
}
}
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