Less invasive fix for EventFd blocking operations (#3394)

Ryujinx.HLE/HOS/Horizon.cs

@@ -309,7 +309,7 @@ namespace Ryujinx.HLE.HOS
             // only then doing connections to SM is safe.
             SmServer.InitDone.WaitOne();
 
-            BsdServer = new ServerBase(KernelContext, "BsdServer", null, 2);
+            BsdServer = new ServerBase(KernelContext, "BsdServer");
             AudRenServer = new ServerBase(KernelContext, "AudioRendererServer");
             AudOutServer = new ServerBase(KernelContext, "AudioOutServer");
             FsServer = new ServerBase(KernelContext, "FsServer");

Ryujinx.HLE/HOS/Services/ServerBase.cs

@@ -42,15 +42,12 @@ namespace Ryujinx.HLE.HOS.Services
         public string Name { get; }
         public Func<IpcService> SmObjectFactory { get; }
 
-        private int _threadCount;
-
-        public ServerBase(KernelContext context, string name, Func<IpcService> smObjectFactory = null, int threadCount = 1)
+        public ServerBase(KernelContext context, string name, Func<IpcService> smObjectFactory = null)
         {
             InitDone = new ManualResetEvent(false);
             _context = context;
             Name = name;
             SmObjectFactory = smObjectFactory;
-            _threadCount = threadCount;
 
             const ProcessCreationFlags flags =
                 ProcessCreationFlags.EnableAslr |
@@ -86,27 +83,6 @@ namespace Ryujinx.HLE.HOS.Services
 
         private void Main()
         {
-            for (int i = 1; i < _threadCount; i++)
-            {
-                KernelResult result = _context.Syscall.CreateThread(out int threadHandle, 0UL, 0UL, 0UL, 44, 3, ServerLoop);
-
-                if (result == KernelResult.Success)
-                {
-                    result = _context.Syscall.StartThread(threadHandle);
-
-                    if (result != KernelResult.Success)
-                    {
-                        Logger.Error?.Print(LogClass.Service, $"Failed to start thread on {Name}: {result}");
-                    }
-
-                    _context.Syscall.CloseHandle(threadHandle);
-                }
-                else
-                {
-                    Logger.Error?.Print(LogClass.Service, $"Failed to create thread on {Name}: {result}");
-                }
-            }
-
             ServerLoop();
         }
 

Ryujinx.HLE/HOS/Services/Sockets/Bsd/Impl/EventFileDescriptor.cs

@@ -18,6 +18,11 @@ namespace Ryujinx.HLE.HOS.Services.Sockets.Bsd
 
         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;