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using Ryujinx.HLE.HOS.Kernel.Common;
using Ryujinx.HLE.HOS.Kernel.Process;
using System.Threading;
namespace Ryujinx.HLE.HOS.Kernel.Ipc
{
class KClientPort : KSynchronizationObject
{
private int _sessionsCount;
private readonly int _maxSessions;
private readonly KPort _parent;
public bool IsLight => _parent.IsLight;
public KClientPort(KernelContext context, KPort parent, int maxSessions) : base(context)
{
_maxSessions = maxSessions;
_parent = parent;
}
public KernelResult Connect(out KClientSession clientSession)
{
clientSession = null;
KProcess currentProcess = KernelStatic.GetCurrentProcess();
if (currentProcess.ResourceLimit != null &&
!currentProcess.ResourceLimit.Reserve(LimitableResource.Session, 1))
{
return KernelResult.ResLimitExceeded;
}
if (!IncrementSessionsCount())
{
currentProcess.ResourceLimit?.Release(LimitableResource.Session, 1);
return KernelResult.SessionCountExceeded;
}
KSession session = new KSession(KernelContext, this);
KernelResult result = _parent.EnqueueIncomingSession(session.ServerSession);
if (result != KernelResult.Success)
{
session.ClientSession.DecrementReferenceCount();
session.ServerSession.DecrementReferenceCount();
return result;
}
clientSession = session.ClientSession;
return result;
}
public KernelResult ConnectLight(out KLightClientSession clientSession)
{
clientSession = null;
KProcess currentProcess = KernelStatic.GetCurrentProcess();
if (currentProcess.ResourceLimit != null &&
!currentProcess.ResourceLimit.Reserve(LimitableResource.Session, 1))
{
return KernelResult.ResLimitExceeded;
}
if (!IncrementSessionsCount())
{
currentProcess.ResourceLimit?.Release(LimitableResource.Session, 1);
return KernelResult.SessionCountExceeded;
}
KLightSession session = new KLightSession(KernelContext);
KernelResult result = _parent.EnqueueIncomingLightSession(session.ServerSession);
if (result != KernelResult.Success)
{
session.ClientSession.DecrementReferenceCount();
session.ServerSession.DecrementReferenceCount();
return result;
}
clientSession = session.ClientSession;
return result;
}
private bool IncrementSessionsCount()
{
while (true)
{
int currentCount = _sessionsCount;
if (currentCount < _maxSessions)
{
if (Interlocked.CompareExchange(ref _sessionsCount, currentCount + 1, currentCount) == currentCount)
{
return true;
}
}
else
{
return false;
}
}
}
public void Disconnect()
{
KernelContext.CriticalSection.Enter();
SignalIfMaximumReached(Interlocked.Decrement(ref _sessionsCount));
KernelContext.CriticalSection.Leave();
}
private void SignalIfMaximumReached(int value)
{
if (value == _maxSessions)
{
Signal();
}
}
public new static KernelResult RemoveName(KernelContext context, string name)
{
KAutoObject foundObj = FindNamedObject(context, name);
if (!(foundObj is KClientPort))
{
return KernelResult.NotFound;
}
return KAutoObject.RemoveName(context, name);
}
}
}
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