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using System;
using System.Runtime.InteropServices;
using System.Threading;
namespace Ryujinx.HLE.HOS.Services.Sockets.Bsd
{
class EventFileDescriptor : IFileDescriptor
{
private ulong _value;
private readonly EventFdFlags _flags;
private AutoResetEvent _event;
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)
{
_value = value;
_flags = flags;
_event = new AutoResetEvent(false);
WriteEvent = new ManualResetEvent(true);
ReadEvent = new ManualResetEvent(true);
}
public int Refcount { get; set; }
public void Dispose()
{
_event.Dispose();
WriteEvent.Dispose();
ReadEvent.Dispose();
}
public LinuxError Read(out int readSize, Span<byte> buffer)
{
if (buffer.Length < sizeof(ulong))
{
readSize = 0;
return LinuxError.EINVAL;
}
ReadEvent.Reset();
lock (_lock)
{
ref ulong count = ref MemoryMarshal.Cast<byte, ulong>(buffer)[0];
if (_value == 0)
{
if (Blocking)
{
while (_value == 0)
{
_event.WaitOne();
}
}
else
{
readSize = 0;
return LinuxError.EAGAIN;
}
}
readSize = sizeof(ulong);
if (_flags.HasFlag(EventFdFlags.Semaphore))
{
--_value;
count = 1;
}
else
{
count = _value;
_value = 0;
}
ReadEvent.Set();
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;
}
WriteEvent.Reset();
lock (_lock)
{
if (_value > _value + count)
{
if (Blocking)
{
_event.WaitOne();
}
else
{
writeSize = 0;
return LinuxError.EAGAIN;
}
}
writeSize = sizeof(ulong);
_value += count;
_event.Set();
WriteEvent.Set();
return LinuxError.SUCCESS;
}
}
}
}
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