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using Ryujinx.HLE.HOS.Services.Sockets.Bsd.Types;
using System;
using System.Runtime.InteropServices;
using System.Threading;
namespace Ryujinx.HLE.HOS.Services.Sockets.Bsd.Impl
{
class EventFileDescriptor : IFileDescriptor
{
private ulong _value;
private readonly EventFdFlags _flags;
private object _lock = new object();
public bool Blocking { get => !_flags.HasFlag(EventFdFlags.NonBlocking); set => throw new NotSupportedException(); }
public ManualResetEvent WriteEvent { get; }
public ManualResetEvent ReadEvent { get; }
public EventFileDescriptor(ulong value, EventFdFlags flags)
{
// FIXME: We should support blocking operations.
// Right now they can't be supported because it would cause the
// service to lock up as we only have one thread processing requests.
flags |= EventFdFlags.NonBlocking;
_value = value;
_flags = flags;
WriteEvent = new ManualResetEvent(false);
ReadEvent = new ManualResetEvent(false);
UpdateEventStates();
}
public int Refcount { get; set; }
public void Dispose()
{
WriteEvent.Dispose();
ReadEvent.Dispose();
}
private void ResetEventStates()
{
WriteEvent.Reset();
ReadEvent.Reset();
}
private void UpdateEventStates()
{
if (_value > 0)
{
ReadEvent.Set();
}
if (_value != uint.MaxValue - 1)
{
WriteEvent.Set();
}
}
public LinuxError Read(out int readSize, Span<byte> buffer)
{
if (buffer.Length < sizeof(ulong))
{
readSize = 0;
return LinuxError.EINVAL;
}
lock (_lock)
{
ResetEventStates();
ref ulong count = ref MemoryMarshal.Cast<byte, ulong>(buffer)[0];
if (_value == 0)
{
if (Blocking)
{
while (_value == 0)
{
Monitor.Wait(_lock);
}
}
else
{
readSize = 0;
UpdateEventStates();
return LinuxError.EAGAIN;
}
}
readSize = sizeof(ulong);
if (_flags.HasFlag(EventFdFlags.Semaphore))
{
--_value;
count = 1;
}
else
{
count = _value;
_value = 0;
}
UpdateEventStates();
return LinuxError.SUCCESS;
}
}
public LinuxError Write(out int writeSize, ReadOnlySpan<byte> buffer)
{
if (!MemoryMarshal.TryRead(buffer, out ulong count) || count == ulong.MaxValue)
{
writeSize = 0;
return LinuxError.EINVAL;
}
lock (_lock)
{
ResetEventStates();
if (_value > _value + count)
{
if (Blocking)
{
Monitor.Wait(_lock);
}
else
{
writeSize = 0;
UpdateEventStates();
return LinuxError.EAGAIN;
}
}
writeSize = sizeof(ulong);
_value += count;
Monitor.Pulse(_lock);
UpdateEventStates();
return LinuxError.SUCCESS;
}
}
}
}
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