Implement WinAPI based TCP socket support.

dub.sdl

@@ -33,13 +33,13 @@ configuration "select" {
 configuration "winapi-optlink" {
 	platforms "windows-x86-dmd"
 	versions "EventcoreWinAPIDriver"
-	sourceFiles "lib/ws2_32.lib"
+	sourceFiles "lib/ws2_32.lib" "lib/kernel32.lib"
 }
 
 configuration "select-optlink" {
 	platforms "windows-x86-dmd"
 	versions "EventcoreSelectDriver"
-	sourceFiles "lib/ws2_32.lib"
+	sourceFiles "lib/ws2_32.lib" "lib/kernel32.lib"
 }
 
 configuration "libasync" {

source/eventcore/drivers/winapi/driver.d

@@ -53,7 +53,7 @@ final class WinAPIEventDriver : EventDriver {
 		m_core = new WinAPIEventDriverCore(m_timers);
 		m_events = new WinAPIEventDriverEvents(m_core);
 		m_files = new WinAPIEventDriverFiles(m_core);
-		m_sockets = new WinAPIEventDriverSockets();
+		m_sockets = new WinAPIEventDriverSockets(m_core);
 		m_dns = new WinAPIEventDriverDNS();
 		m_watchers = new WinAPIEventDriverWatchers(m_core);
 	}

source/eventcore/drivers/winapi/sockets.d

@@ -3,66 +3,346 @@ module eventcore.drivers.winapi.sockets;
 version (Windows):
 
 import eventcore.driver;
+import eventcore.drivers.winapi.core;
 import eventcore.internal.win32;
+import eventcore.internal.utils : AlgebraicChoppedVector, print;
 import std.socket : Address;
 
+private enum WM_USER_SOCKET = WM_USER + 1;
+
 
 final class WinAPIEventDriverSockets : EventDriverSockets {
 @safe: /*@nogc:*/ nothrow:
+	private {
+		alias SocketVector = AlgebraicChoppedVector!(SocketSlot, StreamSocketSlot, StreamListenSocketSlot, DgramSocketSlot);
+		SocketVector m_sockets;
+		WinAPIEventDriverCore m_core;
+		DWORD m_tid;
+		HWND m_hwnd;
+		size_t m_waiters;
+	}
+
+	this(WinAPIEventDriverCore core)
+	@trusted {
+		m_tid = GetCurrentThreadId();
+		m_core = core;
+
+		// setup socket event message window
+		setupWindowClass();
+		m_hwnd = CreateWindowA("VibeWin32MessageWindow", "VibeWin32MessageWindow", 0, 0,0,0,0, HWND_MESSAGE,null,null,null);
+		SetWindowLongPtrA(m_hwnd, GWLP_USERDATA, cast(ULONG_PTR)cast(void*)this);
+		assert(cast(WinAPIEventDriverSockets)cast(void*)GetWindowLongPtrA(m_hwnd, GWLP_USERDATA) is this);
+	}
+
+	package @property size_t waiterCount() const { return m_waiters; }
+
 	override StreamSocketFD connectStream(scope Address peer_address, scope Address bind_address, ConnectCallback on_connect)
-	{
+	@trusted {
-		assert(false, "TODO!");
+		assert(m_tid == GetCurrentThreadId());
+
+		auto fd = WSASocketW(peer_address.addressFamily, SOCK_STREAM, IPPROTO_TCP, null, 0, WSA_FLAG_OVERLAPPED);
+		if (fd == INVALID_SOCKET)
+			return StreamSocketFD.invalid;
+
+		void invalidateSocket() @nogc @trusted nothrow { closesocket(fd); fd = INVALID_SOCKET; }
+
+		int bret;
+		if (bind_address !is null)
+			bret = bind(fd, bind_address.name, bind_address.nameLen);
+		if (bret != 0) {
+			invalidateSocket();
+			on_connect(StreamSocketFD.invalid, ConnectStatus.bindFailure);
+			return StreamSocketFD.invalid;
+		}
+
+		auto sock = adoptStreamInternal(fd);
+
+		auto ret = .connect(fd, peer_address.name, peer_address.nameLen);
+		//auto ret = WSAConnect(m_socket, peer_address.name, peer_address.nameLen, null, null, null, null);
+
+		if (ret == 0) {
+			m_sockets[sock].specific.state = ConnectionState.connected;
+			on_connect(sock, ConnectStatus.connected);
+			return sock;
+		}
+
+		auto err = WSAGetLastError();
+		if (err == WSAEWOULDBLOCK) {
+			with (m_sockets[sock].streamSocket) {
+				connectCallback = on_connect;
+				state = ConnectionState.connecting;
+			}
+			return sock;
+		} else {
+			clearSocketSlot(sock);
+			invalidateSocket();
+			on_connect(StreamSocketFD.invalid, ConnectStatus.unknownError);
+			return StreamSocketFD.invalid;
+		}
 	}
 
 	override StreamSocketFD adoptStream(int socket)
 	{
-		assert(false, "TODO!");
+		return adoptStreamInternal(socket);
+	}
+
+	private StreamSocketFD adoptStreamInternal(SOCKET socket)
+	{
+		auto fd = StreamSocketFD(socket);
+		if (m_sockets[fd].common.refCount) // FD already in use?
+			return StreamSocketFD.invalid;
+
+		uint enable = 1;
+		() @trusted { ioctlsocket(socket, FIONBIO, &enable); } ();
+
+		void setupOverlapped(ref WSAOVERLAPPEDX overlapped) @trusted @nogc nothrow {
+			overlapped.Internal = 0;
+			overlapped.InternalHigh = 0;
+			overlapped.Offset = 0;
+			overlapped.OffsetHigh = 0;
+			overlapped.hEvent = cast(HANDLE)cast(void*)&m_sockets[socket];
+		}
+
+		initSocketSlot(fd);
+		with (m_sockets[socket]) {
+			specific = StreamSocketSlot.init;
+			setupOverlapped(streamSocket.write.overlapped);
+			setupOverlapped(streamSocket.read.overlapped);
+		}
+
+		() @trusted { WSAAsyncSelect(socket, m_hwnd, WM_USER_SOCKET, FD_READ|FD_WRITE|FD_CONNECT|FD_CLOSE); } ();
+
+		return fd;
 	}
 
 	alias listenStream = EventDriverSockets.listenStream;
 	override StreamListenSocketFD listenStream(scope Address bind_address, StreamListenOptions options, AcceptCallback on_accept)
 	{
-		assert(false, "TODO!");
+		auto fd = () @trusted { return WSASocketW(bind_address.addressFamily, SOCK_STREAM, IPPROTO_TCP, null, 0, WSA_FLAG_OVERLAPPED); } ();
+		if (fd == INVALID_SOCKET)
+			return StreamListenSocketFD.invalid;
+
+		void invalidateSocket() @nogc @trusted nothrow { closesocket(fd); fd = INVALID_SOCKET; }
+
+		() @trusted {
+			int tmp_reuse = 1;
+			if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &tmp_reuse, tmp_reuse.sizeof) != 0) {
+				invalidateSocket();
+				return;
+			}
+
+			// FIXME: should SO_EXCLUSIVEADDRUSE be used of StreamListenOptions.reuseAddress isn't set?
+
+			if (bind(fd, bind_address.name, bind_address.nameLen) != 0) {
+				invalidateSocket();
+				return;
+			}
+			if (listen(fd, 128) != 0) {
+				invalidateSocket();
+				return;
+			}
+		} ();
+
+		if (fd == INVALID_SOCKET)
+			return StreamListenSocketFD.invalid;
+
+		auto sock = cast(StreamListenSocketFD)fd;
+		initSocketSlot(sock);
+		m_sockets[sock].specific = StreamListenSocketSlot.init;
+
+		if (on_accept) waitForConnections(sock, on_accept);
+
+		return sock;
 	}
 
 	override void waitForConnections(StreamListenSocketFD sock, AcceptCallback on_accept)
 	{
-		assert(false, "TODO!");
+		assert(!m_sockets[sock].streamListen.acceptCallback);
+		m_sockets[sock].streamListen.acceptCallback = on_accept;
+		() @trusted { WSAAsyncSelect(sock, m_hwnd, WM_USER_SOCKET, FD_ACCEPT); } ();
+		m_core.addWaiter();
 	}
 
 	override ConnectionState getConnectionState(StreamSocketFD sock)
 	{
-		assert(false, "TODO!");
+		return m_sockets[sock].streamSocket.state;
 	}
 
 	override bool getLocalAddress(SocketFD sock, scope RefAddress dst)
 	{
-		assert(false, "TODO!");
+		socklen_t addr_len = dst.nameLen;
+		if (() @trusted { return getsockname(sock, dst.name, &addr_len); } () != 0)
+			return false;
+		dst.cap(addr_len);
+		return true;
 	}
 
 	override bool getRemoteAddress(SocketFD sock, scope RefAddress dst)
 	{
-		assert(false, "TODO!");
+		socklen_t addr_len = dst.nameLen;
+		if (() @trusted { return getpeername(sock, dst.name, &addr_len); } () != 0)
+			return false;
+		dst.cap(addr_len);
+		return true;
 	}
 
 	override void setTCPNoDelay(StreamSocketFD socket, bool enable)
-	{
+	@trusted {
-		assert(false, "TODO!");
+		BOOL eni = enable;
+		setsockopt(INVALID_SOCKET, IPPROTO_TCP, TCP_NODELAY, &eni, eni.sizeof);
 	}
 
 	override void setKeepAlive(StreamSocketFD socket, bool enable)
-	{
+	@trusted {
-		assert(false, "TODO!");
+		BOOL eni = enable;
+		setsockopt(INVALID_SOCKET, SOL_SOCKET, SO_KEEPALIVE, &eni, eni.sizeof);
 	}
 
 	override void read(StreamSocketFD socket, ubyte[] buffer, IOMode mode, IOCallback on_read_finish)
 	{
-		assert(false, "TODO!");
+		WSABUF buf;
+		buf.len = buffer.length;
+		buf.buf = () @trusted { return buffer.ptr; } ();
+
+		m_sockets[socket].streamSocket.read.buffer = buffer;
+		m_sockets[socket].streamSocket.read.mode = mode;
+
+		auto ovl = mode == IOMode.immediate ? null : &m_sockets[socket].streamSocket.read.overlapped;
+		DWORD flags = 0;
+		auto ret = () @trusted { return WSARecv(socket, &buf, 1, null, &flags, ovl, &onIOReadCompleted); } ();
+		if (ret == SOCKET_ERROR) {
+			auto err = WSAGetLastError();
+			if (err == WSA_IO_PENDING) {
+				if (mode == IOMode.immediate) {
+					on_read_finish(socket, IOStatus.wouldBlock, 0);
+					return;
+				}
+			} else {
+				on_read_finish(socket, IOStatus.error, 0);
+				return;
+			}
+		}
+		m_sockets[socket].streamSocket.read.callback = on_read_finish;
+		m_core.addWaiter();
+	}
+
+
+	private static extern(System) nothrow
+	void onIOReadCompleted(DWORD dwError, DWORD cbTransferred, WSAOVERLAPPEDX* lpOverlapped, DWORD dwFlags)
+	{
+		auto slot = () @trusted { return cast(SocketVector.FullField*)lpOverlapped.hEvent; } ();
+
+		if (!slot.streamSocket.read.callback) return;
+
+		void invokeCallback(IOStatus status, size_t nsent)
+		@safe nothrow {
+			slot.common.core.removeWaiter();
+			auto cb = slot.streamSocket.read.callback;
+			slot.streamSocket.read.callback = null;
+			cb(cast(StreamSocketFD)slot.common.fd, status, nsent);
+		}
+
+		slot.streamSocket.read.bytesTransferred += cbTransferred;
+		slot.streamSocket.read.buffer = slot.streamSocket.read.buffer[cbTransferred .. $];
+
+		if (dwError) {
+			invokeCallback(IOStatus.error, 0);
+			return;
+		}
+
+		if (slot.streamSocket.read.mode == IOMode.once || !slot.streamSocket.read.buffer.length) {
+			invokeCallback(IOStatus.ok, cbTransferred);
+			return;
+		}
+
+		WSABUF buf;
+		buf.len = slot.streamSocket.read.buffer.length;
+		buf.buf = () @trusted { return cast(ubyte*)slot.streamSocket.read.buffer.ptr; } ();
+		auto ovl = slot.streamSocket.read.mode == IOMode.immediate ? null : &slot.streamSocket.read.overlapped;
+		DWORD flags = 0;
+		auto ret = () @trusted { return WSARecv(slot.common.fd, &buf, 1, null, &flags, ovl, &onIOReadCompleted); } ();
+		if (ret == SOCKET_ERROR) {
+			auto err = WSAGetLastError();
+			if (err == WSA_IO_PENDING) {
+				if (slot.streamSocket.read.mode == IOMode.immediate) {
+					invokeCallback(IOStatus.wouldBlock, 0);
+				}
+			} else {
+				invokeCallback(IOStatus.error, 0);
+			}
+		}
 	}
 
 	override void write(StreamSocketFD socket, const(ubyte)[] buffer, IOMode mode, IOCallback on_write_finish)
 	{
-		assert(false, "TODO!");
+		WSABUF buf;
+		buf.len = buffer.length;
+		buf.buf = () @trusted { return cast(ubyte*)buffer.ptr; } ();
+
+		m_sockets[socket].streamSocket.write.buffer = buffer;
+		m_sockets[socket].streamSocket.write.mode = mode;
+
+		auto ovl = mode == IOMode.immediate ? null : &m_sockets[socket].streamSocket.write.overlapped;
+		auto ret = () @trusted { return WSASend(socket, &buf, 1, null, 0, ovl, &onIOWriteCompleted); } ();
+		if (ret == SOCKET_ERROR) {
+			auto err = WSAGetLastError();
+			if (err == WSA_IO_PENDING) {
+				if (mode == IOMode.immediate) {
+					on_write_finish(socket, IOStatus.wouldBlock, 0);
+					return;
+				}
+			} else {
+				on_write_finish(socket, IOStatus.error, 0);
+				return;
+			}
+		}
+		m_sockets[socket].streamSocket.write.callback = on_write_finish;
+		m_core.addWaiter();
+	}
+
+	private static extern(System) nothrow
+	void onIOWriteCompleted(DWORD dwError, DWORD cbTransferred, WSAOVERLAPPEDX* lpOverlapped, DWORD dwFlags)
+	{
+		auto slot = () @trusted { return cast(SocketVector.FullField*)lpOverlapped.hEvent; } ();
+
+		if (!slot.streamSocket.write.callback) return;
+
+		void invokeCallback(IOStatus status, size_t nsent)
+		@safe nothrow {
+			slot.common.core.removeWaiter();
+			auto cb = slot.streamSocket.write.callback;
+			slot.streamSocket.write.callback = null;
+			cb(cast(StreamSocketFD)slot.common.fd, status, nsent);
+		}
+
+		slot.streamSocket.write.bytesTransferred += cbTransferred;
+		slot.streamSocket.write.buffer = slot.streamSocket.write.buffer[cbTransferred .. $];
+
+		if (dwError) {
+			invokeCallback(IOStatus.error, 0);
+			return;
+		}
+
+		if (slot.streamSocket.write.mode == IOMode.once || !slot.streamSocket.write.buffer.length) {
+			invokeCallback(IOStatus.ok, cbTransferred);
+			return;
+		}
+
+		WSABUF buf;
+		buf.len = slot.streamSocket.write.buffer.length;
+		buf.buf = () @trusted { return cast(ubyte*)slot.streamSocket.write.buffer.ptr; } ();
+		auto ovl = slot.streamSocket.write.mode == IOMode.immediate ? null : &slot.streamSocket.write.overlapped;
+		auto ret = () @trusted { return WSASend(slot.common.fd, &buf, 1, null, 0, ovl, &onIOWriteCompleted); } ();
+		if (ret == SOCKET_ERROR) {
+			auto err = WSAGetLastError();
+			if (err == WSA_IO_PENDING) {
+				if (slot.streamSocket.write.mode == IOMode.immediate) {
+					invokeCallback(IOStatus.wouldBlock, 0);
+				}
+			} else {
+				invokeCallback(IOStatus.error, 0);
+			}
+		}
 	}
 
 	override void waitForData(StreamSocketFD socket, IOCallback on_data_available)
@@ -72,17 +352,26 @@ final class WinAPIEventDriverSockets : EventDriverSockets {
 
 	override void shutdown(StreamSocketFD socket, bool shut_read = true, bool shut_write = true)
 	{
-		assert(false, "TODO!");
+		() @trusted { WSASendDisconnect(socket, null); } ();
+		with (m_sockets[socket].streamSocket) {
+			state = ConnectionState.closed;
+		}
 	}
 
 	override void cancelRead(StreamSocketFD socket)
-	{
+	@trusted {
-		assert(false, "TODO!");
+		if (!m_sockets[socket].streamSocket.read.callback) return;
+		CancelIoEx(cast(HANDLE)cast(SOCKET)socket, cast(LPOVERLAPPED)&m_sockets[socket].streamSocket.read.overlapped);
+		m_sockets[socket].streamSocket.read.callback = null;
+		m_core.removeWaiter();
 	}
 
 	override void cancelWrite(StreamSocketFD socket)
-	{
+	@trusted {
-		assert(false, "TODO!");
+		if (!m_sockets[socket].streamSocket.write.callback) return;
+		CancelIoEx(cast(HANDLE)cast(SOCKET)socket, cast(LPOVERLAPPED)&m_sockets[socket].streamSocket.write.overlapped);
+		m_sockets[socket].streamSocket.write.callback = null;
+		m_core.removeWaiter();
 	}
 
 	override DatagramSocketFD createDatagramSocket(scope Address bind_address, scope Address target_address)
@@ -125,23 +414,206 @@ final class WinAPIEventDriverSockets : EventDriverSockets {
 		assert(false, "TODO!");
 	}
 
-	override void addRef(SocketFD descriptor)
+	override void addRef(SocketFD fd)
 	{
-		assert(false, "TODO!");
+		assert(m_sockets[fd].common.refCount > 0, "Adding reference to unreferenced socket FD.");
+		m_sockets[fd].common.refCount++;
 	}
 
-	override bool releaseRef(SocketFD descriptor)
+	override bool releaseRef(SocketFD fd)
 	{
-		assert(false, "TODO!");
+		import taggedalgebraic : hasType;
+		assert(m_sockets[fd].common.refCount > 0, "Releasing reference to unreferenced socket FD.");
+		if (--m_sockets[fd].common.refCount == 0) {
+			final switch (m_sockets[fd].specific.kind) with (SocketVector.FieldType) {
+				case Kind.none: break;
+				case Kind.streamSocket:
+					cancelRead(cast(StreamSocketFD)fd);
+					cancelWrite(cast(StreamSocketFD)fd);
+					break;
+				case Kind.streamListen:
+					if (m_sockets[fd].streamListen.acceptCallback)
+						m_core.removeWaiter();
+					break;
+				case Kind.datagramSocket:
+					cancelReceive(cast(DatagramSocketFD)fd);
+					cancelSend(cast(DatagramSocketFD)fd);
+					break;
 			}
 
-	protected override void* rawUserData(StreamSocketFD descriptor, size_t size, DataInitializer initialize, DataInitializer destroy) @system
+			clearSocketSlot(fd);
-	{
+			() @trusted { closesocket(fd); } ();
-		assert(false, "TODO!");
+			return false;
+		}
+		return true;
 	}
 
-	protected override void* rawUserData(DatagramSocketFD descriptor, size_t size, DataInitializer initialize, DataInitializer destroy) @system
+	final protected override void* rawUserData(StreamSocketFD descriptor, size_t size, DataInitializer initialize, DataInitializer destroy)
+	@system {
+		return rawUserDataImpl(descriptor, size, initialize, destroy);
+	}
+
+	final protected override void* rawUserData(DatagramSocketFD descriptor, size_t size, DataInitializer initialize, DataInitializer destroy)
+	@system {
+		return rawUserDataImpl(descriptor, size, initialize, destroy);
+	}
+
+	private void* rawUserDataImpl(FD descriptor, size_t size, DataInitializer initialize, DataInitializer destroy)
+	@system {
+		SocketSlot* fds = &m_sockets[descriptor].common;
+		assert(fds.userDataDestructor is null || fds.userDataDestructor is destroy,
+			"Requesting user data with differing type (destructor).");
+		assert(size <= SocketSlot.userData.length, "Requested user data is too large.");
+		if (size > SocketSlot.userData.length) assert(false);
+		if (!fds.userDataDestructor) {
+			initialize(fds.userData.ptr);
+			fds.userDataDestructor = destroy;
+		}
+		return m_sockets[descriptor].common.userData.ptr;
+	}
+
+	private void initSocketSlot(SocketFD fd)
 	{
-		assert(false, "TODO!");
+		m_sockets[fd.value].common.refCount = 1;
+		m_sockets[fd.value].common.fd = fd;
+		m_sockets[fd.value].common.core = m_core;
+	}
+
+	package void clearSocketSlot(FD fd)
+	{
+		auto slot = () @trusted { return &m_sockets[fd]; } ();
+		if (slot.common.userDataDestructor)
+			() @trusted { slot.common.userDataDestructor(slot.common.userData.ptr); } ();
+		*slot = m_sockets.FullField.init;
+	}
+
+	private static nothrow extern(System)
+	LRESULT onMessage(HWND wnd, UINT msg, WPARAM wparam, LPARAM lparam)
+	{
+		auto driver = () @trusted { return cast(WinAPIEventDriverSockets)cast(void*)GetWindowLongPtrA(wnd, GWLP_USERDATA); } ();
+		switch(msg){
+			default: break;
+			case WM_USER_SOCKET:
+				SOCKET sock = cast(SOCKET)wparam;
+				auto evt = () @trusted { return LOWORD(lparam); } ();
+				auto err = () @trusted { return HIWORD(lparam); } ();
+				auto slot = () @trusted { return &driver.m_sockets[sock]; } ();
+				final switch (slot.specific.kind) with (SocketVector.FieldType) {
+					case Kind.none: break;
+					case Kind.streamSocket:
+						switch (evt) {
+							default: break;
+							case FD_CONNECT:
+								auto cb = slot.streamSocket.connectCallback;
+								slot.streamSocket.connectCallback = null;
+								if (err) {
+									slot.streamSocket.state = ConnectionState.closed;
+									cb(cast(StreamSocketFD)sock, ConnectStatus.refused);
+								} else {
+									slot.streamSocket.state = ConnectionState.connected;
+									cb(cast(StreamSocketFD)sock, ConnectStatus.connected);
+								}
+								break;
+							case FD_READ:
+								break;
+							case FD_WRITE:
+								break;
+						}
+						break;
+					case Kind.streamListen:
+						if (evt == FD_ACCEPT) {
+							/*
+			sock_t sockfd;
+			sockaddr_storage addr;
+			socklen_t addr_len = addr.sizeof;
+			() @trusted { sockfd = accept(cast(sock_t)listenfd, () @trusted { return cast(sockaddr*)&addr; } (), &addr_len); } ();
+			if (sockfd == -1) break;
+
+			setSocketNonBlocking(cast(SocketFD)sockfd);
+			auto fd = cast(StreamSocketFD)sockfd;
+			initSocketSlot(fd);
+			m_sockets[fd].specific = StreamSocketSlot.init;
+			m_sockets[fd].streamSocket.state = ConnectionState.connected;
+			m_loop.registerFD(fd, EventMask.read|EventMask.write|EventMask.status);
+			m_loop.setNotifyCallback!(EventType.status)(fd, &onConnectError);
+			releaseRef(fd); // setNotifyCallback adds a reference, but waiting for status/disconnect should not affect the ref count
+			//print("accept %d", sockfd);
+			scope RefAddress addrc = new RefAddress(() @trusted { return cast(sockaddr*)&addr; } (), addr_len);
+			m_sockets[listenfd].streamListen.acceptCallback(cast(StreamListenSocketFD)listenfd, fd, addrc);
+							*/
+							SOCKADDR_STORAGE addr;
+							socklen_t addr_len = addr.sizeof;
+							auto clientsockfd = () @trusted { return WSAAccept(sock, cast(sockaddr*)&addr, &addr_len, null, 0); } ();
+							if (clientsockfd == INVALID_SOCKET) return 0;
+							auto clientsock = driver.adoptStreamInternal(clientsockfd);
+							scope RefAddress addrc = new RefAddress(() @trusted { return cast(sockaddr*)&addr; } (), addr_len);
+							slot.streamListen.acceptCallback(cast(StreamListenSocketFD)sock, clientsock, addrc);
+						}
+						break;
+					case Kind.datagramSocket:
+						break;
+				}
+				return 0;
+		}
+		return () @trusted { return DefWindowProcA(wnd, msg, wparam, lparam); } ();
 	}
 }
+
+void setupWindowClass() nothrow
+@trusted {
+	static __gshared registered = false;
+
+	if (registered) return;
+	
+	WNDCLASSA wc;
+	wc.lpfnWndProc = &WinAPIEventDriverSockets.onMessage;
+	wc.lpszClassName = "VibeWin32MessageWindow";
+	RegisterClassA(&wc);
+	registered = true;
+}
+
+static struct SocketSlot {
+	SocketFD fd; // redundant, but needed by the current IO Completion Routines based approach
+	WinAPIEventDriverCore core; // redundant, but needed by the current IO Completion Routines based approach
+	int refCount;
+	DataInitializer userDataDestructor;
+	ubyte[16*size_t.sizeof] userData;
+}
+
+private struct StreamSocketSlot {
+	alias Handle = StreamSocketFD;
+	StreamDirection!true write;
+	StreamDirection!false read;
+	ConnectCallback connectCallback;
+	ConnectionState state;
+}
+
+static struct StreamDirection(bool RO) {
+	WSAOVERLAPPEDX overlapped;
+	static if (RO) const(ubyte)[] buffer;
+	else ubyte[] buffer;
+	size_t bytesTransferred;
+	IOMode mode;
+	IOCallback callback;
+}
+
+private struct StreamListenSocketSlot {
+	alias Handle = StreamListenSocketFD;
+	AcceptCallback acceptCallback;
+}
+
+private struct DgramSocketSlot {
+	alias Handle = DatagramSocketFD;
+	DgramDirection!true write;
+	DgramDirection!false read;
+	Address targetAddr;
+}
+
+static struct DgramDirection(bool RO) {
+	WSAOVERLAPPEDX overlapped;
+	static if (RO) const(ubyte)[] buffer;
+	else ubyte[] buffer;
+	size_t bytesTransferred;
+	IOMode mode;
+	DatagramIOCallback callback;
+}

source/eventcore/internal/win32.d

@@ -5,7 +5,7 @@ version(Windows):
 public import core.sys.windows.windows;
 public import core.sys.windows.winsock2;
 
-extern(System) nothrow @nogc:
+extern(System) nothrow:
 
 enum {
 	FD_READ = 0x0001,
@@ -130,22 +130,25 @@ alias LPLOOKUPSERVICE_COMPLETION_ROUTINE = void function(DWORD, DWORD, WSAOVERLA
 alias LPCONDITIONPROC = void*;
 alias LPTRANSMIT_FILE_BUFFERS = void*;
 
+int WSARecv(SOCKET s, WSABUF* lpBuffers, DWORD dwBufferCount, DWORD* lpNumberOfBytesRecvd, DWORD* lpFlags, in WSAOVERLAPPEDX* lpOverlapped, LPWSAOVERLAPPED_COMPLETION_ROUTINEX lpCompletionRoutine);
+int WSASend(SOCKET s, in WSABUF* lpBuffers, DWORD dwBufferCount, DWORD* lpNumberOfBytesSent, DWORD dwFlags, in WSAOVERLAPPEDX* lpOverlapped, LPWSAOVERLAPPED_COMPLETION_ROUTINEX lpCompletionRoutine);
+int GetAddrInfoExW(LPCWSTR pName, LPCWSTR pServiceName, DWORD dwNameSpace, GUID* lpNspId, const ADDRINFOEXW *pHints, ADDRINFOEXW **ppResult, timeval *timeout, WSAOVERLAPPEDX* lpOverlapped, LPLOOKUPSERVICE_COMPLETION_ROUTINE lpCompletionRoutine, HANDLE* lpNameHandle);
+
+@nogc:
 SOCKET WSAAccept(SOCKET s, sockaddr *addr, INT* addrlen, LPCONDITIONPROC lpfnCondition, DWORD_PTR dwCallbackData);
 int WSAAsyncSelect(SOCKET s, HWND hWnd, uint wMsg, sizediff_t lEvent);
 SOCKET WSASocketW(int af, int type, int protocol, WSAPROTOCOL_INFOW *lpProtocolInfo, uint g, DWORD dwFlags);
-int WSARecv(SOCKET s, WSABUF* lpBuffers, DWORD dwBufferCount, DWORD* lpNumberOfBytesRecvd, DWORD* lpFlags, in WSAOVERLAPPEDX* lpOverlapped, LPWSAOVERLAPPED_COMPLETION_ROUTINEX lpCompletionRoutine);
-int WSASend(SOCKET s, in WSABUF* lpBuffers, DWORD dwBufferCount, DWORD* lpNumberOfBytesSent, DWORD dwFlags, in WSAOVERLAPPEDX* lpOverlapped, LPWSAOVERLAPPED_COMPLETION_ROUTINEX lpCompletionRoutine);
 int WSASendDisconnect(SOCKET s, WSABUF* lpOutboundDisconnectData);
 INT WSAStringToAddressA(in LPTSTR AddressString, INT AddressFamily, in WSAPROTOCOL_INFO* lpProtocolInfo, SOCKADDR* lpAddress, INT* lpAddressLength);
 INT WSAStringToAddressW(in LPWSTR AddressString, INT AddressFamily, in WSAPROTOCOL_INFOW* lpProtocolInfo, SOCKADDR* lpAddress, INT* lpAddressLength);
 INT WSAAddressToStringW(in SOCKADDR* lpsaAddress, DWORD dwAddressLength, in WSAPROTOCOL_INFO* lpProtocolInfo, LPWSTR lpszAddressString, DWORD* lpdwAddressStringLength);
-int GetAddrInfoExW(LPCWSTR pName, LPCWSTR pServiceName, DWORD dwNameSpace, GUID* lpNspId, const ADDRINFOEXW *pHints, ADDRINFOEXW **ppResult, timeval *timeout, WSAOVERLAPPEDX* lpOverlapped, LPLOOKUPSERVICE_COMPLETION_ROUTINE lpCompletionRoutine, HANDLE* lpNameHandle);
 int GetAddrInfoW(LPCWSTR pName, LPCWSTR pServiceName, const ADDRINFOW *pHints, ADDRINFOW **ppResult);
 int getaddrinfo(LPCSTR pName, LPCSTR pServiceName, const ADDRINFOA *pHints, ADDRINFOA **ppResult);
 void FreeAddrInfoW(ADDRINFOW* pAddrInfo);
 void FreeAddrInfoExW(ADDRINFOEXW* pAddrInfo);
 void freeaddrinfo(ADDRINFOA* ai);
 BOOL TransmitFile(SOCKET hSocket, HANDLE hFile, DWORD nNumberOfBytesToWrite, DWORD nNumberOfBytesPerSend, OVERLAPPED* lpOverlapped, LPTRANSMIT_FILE_BUFFERS lpTransmitBuffers, DWORD dwFlags);
+BOOL CancelIoEx(HANDLE hFile, LPOVERLAPPED lpOverlapped);
 
 struct WSAOVERLAPPEDX {
 	ULONG_PTR Internal;