Split up PosixEventDriver into individual classes.

source/eventcore/core.d

@@ -5,9 +5,11 @@ public import eventcore.driver;
 import eventcore.drivers.epoll;
 import eventcore.drivers.libasync;
 import eventcore.drivers.select;
+import eventcore.drivers.posix;
 
 version (Have_libasync) alias NativeEventDriver = LibasyncEventDriver;
-else alias NativeEventDriver = SelectEventDriver;
+else version (linux) alias NativeEventDriver = PosixEventDriver!EpollEventLoop;
+else alias NativeEventDriver = PosixEventDriver!SelectEventLoop;
 
 @property EventDriver eventDriver()
 @safe @nogc nothrow {

source/eventcore/driver.d

@@ -8,19 +8,19 @@ import std.socket : Address;
 interface EventDriver {
 @safe: /*@nogc:*/ nothrow:
 	@property EventDriverCore core();
-	@property EventDriverFiles files();
-	@property EventDriverSockets sockets();
 	@property EventDriverTimers timers();
 	@property EventDriverEvents events();
 	@property EventDriverSignals signals();
+	@property EventDriverSockets sockets();
+	@property EventDriverFiles files();
 	@property EventDriverWatchers watchers();
+
+	/// Releases all resources associated with the driver
+	void dispose();
 }
 
 interface EventDriverCore {
 @safe: /*@nogc:*/ nothrow:
-	/// Releases all resources associated with the driver
-	void dispose();
-
 	/** The number of pending callbacks.
 
 		When this number drops to zero, the event loop can safely be quit. It is

source/eventcore/drivers/epoll.d

@@ -17,7 +17,9 @@ import core.sys.posix.sys.time : timeval;
 import core.sys.linux.epoll;
 
 
-final class EpollEventDriver : PosixEventDriver {
+final class EpollEventLoop : PosixEventLoop {
+@safe: nothrow:
+
 	private {
 		int m_epoll;
 		epoll_event[] m_events;
@@ -29,15 +31,6 @@ final class EpollEventDriver : PosixEventDriver {
 		m_events.length = 100;
 	}
 
-	nothrow @safe {
-		override @property EpollEventDriver core() { return this; }
-		override @property EpollEventDriver sockets() { return this; }
-		override @property EpollEventDriver timers() { return this; }
-		override @property EpollEventDriver events() { return this; }
-		override @property EpollEventDriver signals() { return this; }
-		override @property EpollEventDriver watchers() { return this; }
-	}
-
 	override bool doProcessEvents(Duration timeout)
 	@trusted {
 		import std.algorithm : min;
@@ -66,7 +59,6 @@ final class EpollEventDriver : PosixEventDriver {
 	override void dispose()
 	{
 		import core.sys.posix.unistd : close;
-		super.dispose();
 		close(m_epoll);
 	}
 

source/eventcore/drivers/posix.d

@@ -37,48 +37,87 @@ private long currStdTime()
 	return Clock.currStdTime;
 }
 
-abstract class PosixEventDriver : EventDriver,
-		EventDriverCore, EventDriverSockets, EventDriverTimers,
-		EventDriverEvents, EventDriverSignals, EventDriverWatchers
-{
+final class PosixEventDriver(Loop : PosixEventLoop) : EventDriver {
 @safe: /*@nogc:*/ nothrow:
 
 	private {
-		ChoppedVector!FDSlot m_fds;
-		size_t m_waiterCount = 0;
-		bool m_exit = false;
-		FD m_wakeupEvent;
-		ThreadedFileEventDriver!PosixEventDriver m_files;
+		alias CoreDriver = PosixEventDriverCore!(Loop, LoopTimeoutTimerDriver);
+		alias EventsDriver = PosixEventDriverEvents!Loop;
+		alias SignalsDriver = PosixEventDriverSignals!Loop;
+		alias TimerDriver = LoopTimeoutTimerDriver;
+		alias SocketsDriver = PosixEventDriverSockets!Loop;
+		alias FileDriver = ThreadedFileEventDriver!EventsDriver;
+		alias WatcherDriver = PosixEventDriverWatchers!Loop;
+
+		Loop m_loop;
+		CoreDriver m_core;
+		EventsDriver m_events;
+		SignalsDriver m_signals;
+		LoopTimeoutTimerDriver m_timers;
+		SocketsDriver m_sockets;
+		FileDriver m_files;
+		WatcherDriver m_watchers;
 	}
 
-	protected this()
+	this()
 	{
-		m_wakeupEvent = eventfd(0, EFD_NONBLOCK);
-		initFD(m_wakeupEvent);
-		registerFD(m_wakeupEvent, EventMask.read);
-		//startNotify!(EventType.read)(m_wakeupEvent, null); // should already be caught by registerFD
-		m_files = new ThreadedFileEventDriver!PosixEventDriver(this);
+		m_loop = new Loop;
+		m_events = new EventsDriver(m_loop);
+		m_signals = new SignalsDriver(m_loop);
+		m_timers = new TimerDriver;
+		m_core = new CoreDriver(m_loop, m_timers);
+		m_sockets = new SocketsDriver(m_loop);
+		m_files = new FileDriver(m_events);
+		m_watchers = new WatcherDriver(m_loop);
 	}
 
 	// force overriding these in the (final) sub classes to avoid virtual calls
-	abstract override @property PosixEventDriver core();
-	final override @property ThreadedFileEventDriver!PosixEventDriver files() { return m_files; }
-	abstract override @property PosixEventDriver sockets();
-	abstract override @property PosixEventDriver timers();
-	abstract override @property PosixEventDriver events();
-	abstract override @property PosixEventDriver signals();
-	abstract override @property PosixEventDriver watchers();
+	final override @property CoreDriver core() { return m_core; }
+	final override @property EventsDriver events() { return m_events; }
+	final override @property SignalsDriver signals() { return m_signals; }
+	final override @property TimerDriver timers() { return m_timers; }
+	final override @property SocketsDriver sockets() { return m_sockets; }
+	final override @property FileDriver files() { return m_files; }
+	final override @property WatcherDriver watchers() { return m_watchers; }
 
-	mixin DefaultTimerImpl!();
+	final override void dispose()
+	{
+		m_files.dispose();
+		m_loop.dispose();		
+	}
+}
 
-	protected int maxFD() const { return cast(int)m_fds.length; }
 
-	@property size_t waiterCount() const { return m_waiterCount; }
+final class PosixEventDriverCore(Loop : PosixEventLoop, Timers : EventDriverTimers) : EventDriverCore {
+@safe: nothrow:
+	import core.time : Duration;
+
+	protected alias ExtraEventsCallback = bool delegate(long);
+
+	private {
+		Loop m_loop;
+		Timers m_timers;
+		bool m_exit = false;
+		FD m_wakeupEvent;
+	}
+
+	protected this(Loop loop, Timers timers)
+	{
+		m_loop = loop;
+		m_timers = timers;
+
+		m_wakeupEvent = eventfd(0, EFD_NONBLOCK);
+		m_loop.initFD(m_wakeupEvent);
+		m_loop.registerFD(m_wakeupEvent, EventMask.read);
+		//startNotify!(EventType.read)(m_wakeupEvent, null); // should already be caught by registerFD
+	}
+
+	@property size_t waiterCount() const { return m_loop.m_waiterCount; }
 
 	final override ExitReason processEvents(Duration timeout)
 	{
 		import std.algorithm : min;
-		import core.time : seconds;
+		import core.time : hnsecs, seconds;
 
 		if (m_exit) {
 			m_exit = false;
@@ -90,16 +129,16 @@ abstract class PosixEventDriver : EventDriver,
 		bool got_events;
 
 		if (timeout <= 0.seconds) {
-			got_events = doProcessEvents(0.seconds);
-			processTimers(currStdTime);
+			got_events = m_loop.doProcessEvents(0.seconds);
+			m_timers.process(currStdTime);
 		} else {
 			long now = currStdTime;
 			do {
-				auto nextto = min(getNextTimeout(now), timeout);
-				got_events = doProcessEvents(nextto);
+				auto nextto = min(m_timers.getNextTimeout(now), timeout);
+				got_events = m_loop.doProcessEvents(nextto);
 				long prev_step = now;
 				now = currStdTime;
-				got_events |= processTimers(now);
+				got_events |= m_timers.process(now);
 				if (timeout != Duration.max)
 					timeout -= (now - prev_step).hnsecs;
 			} while (timeout > 0.seconds && !m_exit && !got_events);
@@ -126,12 +165,27 @@ abstract class PosixEventDriver : EventDriver,
 		m_exit = false;
 	}
 
-	protected abstract bool doProcessEvents(Duration dur);
-	
-	abstract void dispose()
-	{
-		m_files.dispose();
+	final protected override void* rawUserData(StreamSocketFD descriptor, size_t size, DataInitializer initialize, DataInitializer destroy)
+	@system {
+		FDSlot* fds = &m_loop.m_fds[descriptor];
+		assert(fds.userDataDestructor is null || fds.userDataDestructor is destroy,
+			"Requesting user data with differing type (destructor).");
+		assert(size <= FDSlot.userData.length, "Requested user data is too large.");
+		if (size > FDSlot.userData.length) assert(false);
+		if (!fds.userDataDestructor) {
+			initialize(fds.userData.ptr);
+			fds.userDataDestructor = destroy;
 		}
+		return m_loop.m_fds[descriptor].userData.ptr;
+	}
+}
+
+
+final class PosixEventDriverSockets(Loop : PosixEventLoop) : EventDriverSockets {
+@safe: /*@nogc:*/ nothrow:
+	private Loop m_loop;
+
+	this(Loop loop) { m_loop = loop; }
 
 	final override StreamSocketFD connectStream(scope Address address, ConnectCallback on_connect)
 	{
@@ -153,9 +207,8 @@ abstract class PosixEventDriver : EventDriver,
 			return sock;
 		}
 
-		registerFD(sock, EventMask.read|EventMask.write|EventMask.status);
-
-		initFD(sock);
+		m_loop.initFD(sock);
+		m_loop.registerFD(sock, EventMask.read|EventMask.write|EventMask.status);
 
 		auto ret = () @trusted { return connect(sock, address.name, address.nameLen); } ();
 		if (ret == 0) {
@@ -163,13 +216,13 @@ abstract class PosixEventDriver : EventDriver,
 		} else {
 			auto err = getSocketError();
 			if (err == EINPROGRESS) {
-				with (m_fds[sock]) {
+				with (m_loop.m_fds[sock]) {
 					connectCallback = on_connect;
 				}
-				startNotify!(EventType.write)(sock, &onConnect);
+				m_loop.startNotify!(EventType.write)(sock, &onConnect);
 			} else {
-				clearFD(sock);
-				unregisterFD(sock);
+				m_loop.clearFD(sock);
+				m_loop.unregisterFD(sock);
 				invalidateSocket();
 				on_connect(sock, ConnectStatus.unknownError);
 				return sock;
@@ -181,14 +234,14 @@ abstract class PosixEventDriver : EventDriver,
 
 	private void onConnect(FD sock)
 	{
-		setNotifyCallback!(EventType.write)(sock, null);
-		m_fds[sock].connectCallback(cast(StreamSocketFD)sock, ConnectStatus.connected);
+		m_loop.setNotifyCallback!(EventType.write)(sock, null);
+		m_loop.m_fds[sock].connectCallback(cast(StreamSocketFD)sock, ConnectStatus.connected);
 	}
 
 	private void onConnectError(FD sock)
 	{
 		// FIXME: determine the correct kind of error!
-		m_fds[sock].connectCallback(cast(StreamSocketFD)sock, ConnectStatus.refused);
+		m_loop.m_fds[sock].connectCallback(cast(StreamSocketFD)sock, ConnectStatus.refused);
 	}
 
 	final override StreamListenSocketFD listenStream(scope Address address, AcceptCallback on_accept)
@@ -216,7 +269,7 @@ abstract class PosixEventDriver : EventDriver,
 		if (sock == StreamListenSocketFD.invalid)
 			return sock;
 
-		initFD(sock);
+		m_loop.initFD(sock);
 
 		if (on_accept) waitForConnections(sock, on_accept);
 
@@ -226,9 +279,9 @@ abstract class PosixEventDriver : EventDriver,
 	final override void waitForConnections(StreamListenSocketFD sock, AcceptCallback on_accept)
 	{
 		log("wait for conn");
-		registerFD(sock, EventMask.read);
-		m_fds[sock].acceptCallback = on_accept;
-		startNotify!(EventType.read)(sock, &onAccept);
+		m_loop.registerFD(sock, EventMask.read);
+		m_loop.m_fds[sock].acceptCallback = on_accept;
+		m_loop.startNotify!(EventType.read)(sock, &onAccept);
 		onAccept(sock);
 	}
 
@@ -244,10 +297,10 @@ abstract class PosixEventDriver : EventDriver,
 
 			setSocketNonBlocking(cast(SocketFD)sockfd);
 			auto fd = cast(StreamSocketFD)sockfd;
-			registerFD(fd, EventMask.read|EventMask.write|EventMask.status);
-			initFD(fd);
+			m_loop.initFD(fd);
+			m_loop.registerFD(fd, EventMask.read|EventMask.write|EventMask.status);
 			//print("accept %d", sockfd);
-			m_fds[listenfd].acceptCallback(cast(StreamListenSocketFD)listenfd, fd);
+			m_loop.m_fds[listenfd].acceptCallback(cast(StreamListenSocketFD)listenfd, fd);
 		}
 	}
 
@@ -299,33 +352,33 @@ abstract class PosixEventDriver : EventDriver,
 			}
 		}
 
-		with (m_fds[socket]) {
+		with (m_loop.m_fds[socket]) {
 			readCallback = on_read_finish;
 			readMode = mode;
 			bytesRead = ret > 0 ? ret : 0;
 			readBuffer = buffer;
 		}
 
-		setNotifyCallback!(EventType.read)(socket, &onSocketRead);
+		m_loop.setNotifyCallback!(EventType.read)(socket, &onSocketRead);
 	}
 
 	override void cancelRead(StreamSocketFD socket)
 	{
-		assert(m_fds[socket].readCallback !is null, "Cancelling read when there is no read in progress.");
-		setNotifyCallback!(EventType.read)(socket, null);
-		with (m_fds[socket]) {
+		assert(m_loop.m_fds[socket].readCallback !is null, "Cancelling read when there is no read in progress.");
+		m_loop.setNotifyCallback!(EventType.read)(socket, null);
+		with (m_loop.m_fds[socket]) {
 			readBuffer = null;
 		}
 	}
 
 	private void onSocketRead(FD fd)
 	{
-		auto slot = () @trusted { return &m_fds[fd]; } ();
+		auto slot = () @trusted { return &m_loop.m_fds[fd]; } ();
 		auto socket = cast(StreamSocketFD)fd;
 
 		void finalize()(IOStatus status)
 		{
-			setNotifyCallback!(EventType.read)(socket, null);
+			m_loop.setNotifyCallback!(EventType.read)(socket, null);
 			//m_fds[fd].readBuffer = null;
 			slot.readCallback(socket, status, slot.bytesRead);
 		}
@@ -394,26 +447,26 @@ abstract class PosixEventDriver : EventDriver,
 			}
 		}
 
-		with (m_fds[socket]) {
+		with (m_loop.m_fds[socket]) {
 			writeCallback = on_write_finish;
 			writeMode = mode;
 			bytesWritten = ret > 0 ? ret : 0;
 			writeBuffer = buffer;
 		}
 
-		setNotifyCallback!(EventType.write)(socket, &onSocketWrite);
+		m_loop.setNotifyCallback!(EventType.write)(socket, &onSocketWrite);
 	}
 
 	override void cancelWrite(StreamSocketFD socket)
 	{
-		assert(m_fds[socket].writeCallback !is null, "Cancelling write when there is no write in progress.");
-		setNotifyCallback!(EventType.write)(socket, null);
-		m_fds[socket].writeBuffer = null;
+		assert(m_loop.m_fds[socket].writeCallback !is null, "Cancelling write when there is no write in progress.");
+		m_loop.setNotifyCallback!(EventType.write)(socket, null);
+		m_loop.m_fds[socket].writeBuffer = null;
 	}
 
 	private void onSocketWrite(FD fd)
 	{
-		auto slot = () @trusted { return &m_fds[fd]; } ();
+		auto slot = () @trusted { return &m_loop.m_fds[fd]; } ();
 		auto socket = cast(StreamSocketFD)fd;
 
 		sizediff_t ret;
@@ -422,14 +475,14 @@ abstract class PosixEventDriver : EventDriver,
 		if (ret < 0) {
 			auto err = getSocketError();
 			if (err != EAGAIN) {
-				setNotifyCallback!(EventType.write)(socket, null);
+				m_loop.setNotifyCallback!(EventType.write)(socket, null);
 				slot.writeCallback(socket, IOStatus.error, slot.bytesRead);
 				return;
 			}
 		}
 
 		if (ret == 0) {
-			setNotifyCallback!(EventType.write)(socket, null);
+			m_loop.setNotifyCallback!(EventType.write)(socket, null);
 			slot.writeCallback(cast(StreamSocketFD)socket, IOStatus.disconnected, slot.bytesWritten);
 			return;
 		}
@@ -438,7 +491,7 @@ abstract class PosixEventDriver : EventDriver,
 			slot.bytesWritten += ret;
 			slot.writeBuffer = slot.writeBuffer[ret .. $];
 			if (slot.writeMode != IOMode.all || slot.writeBuffer.length == 0) {
-				setNotifyCallback!(EventType.write)(socket, null);
+				m_loop.setNotifyCallback!(EventType.write)(socket, null);
 				slot.writeCallback(cast(StreamSocketFD)socket, IOStatus.ok, slot.bytesWritten);
 				return;
 			}
@@ -471,24 +524,24 @@ abstract class PosixEventDriver : EventDriver,
 			return;
 		}
 
-		with (m_fds[socket]) {
+		with (m_loop.m_fds[socket]) {
 			readCallback = on_data_available;
 			readMode = IOMode.once;
 			bytesRead = 0;
 			readBuffer = null;
 		}
 
-		setNotifyCallback!(EventType.read)(socket, &onSocketDataAvailable);
+		m_loop.setNotifyCallback!(EventType.read)(socket, &onSocketDataAvailable);
 	}
 
 	private void onSocketDataAvailable(FD fd)
 	{
-		auto slot = () @trusted { return &m_fds[fd]; } ();
+		auto slot = () @trusted { return &m_loop.m_fds[fd]; } ();
 		auto socket = cast(StreamSocketFD)fd;
 
 		void finalize()(IOStatus status)
 		{
-			setNotifyCallback!(EventType.read)(socket, null);
+			m_loop.setNotifyCallback!(EventType.read)(socket, null);
 			//m_fds[fd].readBuffer = null;
 			slot.readCallback(socket, status, 0);
 		}
@@ -522,9 +575,8 @@ abstract class PosixEventDriver : EventDriver,
 			return DatagramSocketFD.init;
 		}
 
-		registerFD(sock, EventMask.read|EventMask.write|EventMask.status);
-
-		initFD(sock);
+		m_loop.initFD(sock);
+		m_loop.registerFD(sock, EventMask.read|EventMask.write|EventMask.status);
 
 		return sock;
 	}
@@ -551,14 +603,14 @@ abstract class PosixEventDriver : EventDriver,
 			if (mode == IOMode.immediate) {
 				on_receive_finish(socket, IOStatus.wouldBlock, 0, null);
 			} else {
-				with (m_fds[socket]) {
+				with (m_loop.m_fds[socket]) {
 					readCallback = () @trusted { return cast(IOCallback)on_receive_finish; } ();
 					readMode = mode;
 					bytesRead = 0;
 					readBuffer = buffer;
 				}
 
-				setNotifyCallback!(EventType.read)(socket, &onDgramRead);
+				m_loop.setNotifyCallback!(EventType.read)(socket, &onDgramRead);
 			}
 			return;
 		}
@@ -568,14 +620,14 @@ abstract class PosixEventDriver : EventDriver,
 
 	void cancelReceive(DatagramSocketFD socket)
 	{
-		assert(m_fds[socket].readCallback !is null, "Cancelling read when there is no read in progress.");
-		setNotifyCallback!(EventType.read)(socket, null);
-		m_fds[socket].readBuffer = null;
+		assert(m_loop.m_fds[socket].readCallback !is null, "Cancelling read when there is no read in progress.");
+		m_loop.setNotifyCallback!(EventType.read)(socket, null);
+		m_loop.m_fds[socket].readBuffer = null;
 	}
 
 	private void onDgramRead(FD fd)
 	@trusted { // DMD 2.072.0-b2: scope considered unsafe
-		auto slot = () @trusted { return &m_fds[fd]; } ();
+		auto slot = () @trusted { return &m_loop.m_fds[fd]; } ();
 		auto socket = cast(DatagramSocketFD)fd;
 
 		sizediff_t ret;
@@ -586,13 +638,13 @@ abstract class PosixEventDriver : EventDriver,
 		if (ret < 0) {
 			auto err = getSocketError();
 			if (err != EAGAIN) {
-				setNotifyCallback!(EventType.read)(socket, null);
+				m_loop.setNotifyCallback!(EventType.read)(socket, null);
 				() @trusted { return cast(DatagramIOCallback)slot.readCallback; } ()(socket, IOStatus.error, 0, null);
 				return;
 			}
 		}
 
-		setNotifyCallback!(EventType.read)(socket, null);
+		m_loop.setNotifyCallback!(EventType.read)(socket, null);
 		() @trusted { return cast(DatagramIOCallback)slot.readCallback; } ()(socket, IOStatus.ok, ret, src_addr);
 	}
 
@@ -603,7 +655,7 @@ abstract class PosixEventDriver : EventDriver,
 		sizediff_t ret;
 		if (target_address) {
 			() @trusted { ret = .sendto(socket, buffer.ptr, buffer.length, 0, target_address.name, target_address.nameLen); } ();
-			m_fds[socket].targetAddr = target_address;
+			m_loop.m_fds[socket].targetAddr = target_address;
 		} else {
 			() @trusted { ret = .send(socket, buffer.ptr, buffer.length, 0); } ();
 		}
@@ -619,14 +671,14 @@ abstract class PosixEventDriver : EventDriver,
 			if (mode == IOMode.immediate) {
 				on_send_finish(socket, IOStatus.wouldBlock, 0, null);
 			} else {
-				with (m_fds[socket]) {
+				with (m_loop.m_fds[socket]) {
 					writeCallback = () @trusted { return cast(IOCallback)on_send_finish; } ();
 					writeMode = mode;
 					bytesWritten = 0;
 					writeBuffer = buffer;
 				}
 
-				setNotifyCallback!(EventType.write)(socket, &onDgramWrite);
+				m_loop.setNotifyCallback!(EventType.write)(socket, &onDgramWrite);
 			}
 			return;
 		}
@@ -636,14 +688,14 @@ abstract class PosixEventDriver : EventDriver,
 
 	void cancelSend(DatagramSocketFD socket)
 	{
-		assert(m_fds[socket].writeCallback !is null, "Cancelling write when there is no write in progress.");
-		setNotifyCallback!(EventType.write)(socket, null);
-		m_fds[socket].writeBuffer = null;
+		assert(m_loop.m_fds[socket].writeCallback !is null, "Cancelling write when there is no write in progress.");
+		m_loop.setNotifyCallback!(EventType.write)(socket, null);
+		m_loop.m_fds[socket].writeBuffer = null;
 	}
 
 	private void onDgramWrite(FD fd)
 	{
-		auto slot = () @trusted { return &m_fds[fd]; } ();
+		auto slot = () @trusted { return &m_loop.m_fds[fd]; } ();
 		auto socket = cast(DatagramSocketFD)fd;
 
 		sizediff_t ret;
@@ -656,74 +708,91 @@ abstract class PosixEventDriver : EventDriver,
 		if (ret < 0) {
 			auto err = getSocketError();
 			if (err != EAGAIN) {
-				setNotifyCallback!(EventType.write)(socket, null);
+				m_loop.setNotifyCallback!(EventType.write)(socket, null);
 				() @trusted { return cast(DatagramIOCallback)slot.writeCallback; } ()(socket, IOStatus.error, 0, null);
 				return;
 			}
 		}
 
-		setNotifyCallback!(EventType.write)(socket, null);
+		m_loop.setNotifyCallback!(EventType.write)(socket, null);
 		() @trusted { return cast(DatagramIOCallback)slot.writeCallback; } ()(socket, IOStatus.ok, ret, null);
 	}
 
 	final override void addRef(SocketFD fd)
 	{
-		auto pfd = () @trusted { return &m_fds[fd]; } ();
+		auto pfd = () @trusted { return &m_loop.m_fds[fd]; } ();
 		assert(pfd.refCount > 0, "Adding reference to unreferenced socket FD.");
-		m_fds[fd].refCount++;
+		m_loop.m_fds[fd].refCount++;
 	}
 
 	final override void releaseRef(SocketFD fd)
 	{
-		auto pfd = () @trusted { return &m_fds[fd]; } ();
+		auto pfd = () @trusted { return &m_loop.m_fds[fd]; } ();
 		assert(pfd.refCount > 0, "Releasing reference to unreferenced socket FD.");
-		if (--m_fds[fd].refCount == 0) {
-			unregisterFD(fd);
-			clearFD(fd);
+		if (--m_loop.m_fds[fd].refCount == 0) {
+			m_loop.unregisterFD(fd);
+			m_loop.clearFD(fd);
 			closeSocket(fd);
 		}
 	}
 
+	private SocketFD createSocket(AddressFamily family, int type)
+	{
+		int sock;
+		() @trusted { sock = socket(family, type, 0); } ();
+		if (sock == -1) return SocketFD.invalid;
+		setSocketNonBlocking(cast(SocketFD)sock);
+		return cast(SocketFD)sock;
+	}
+}
+
+
+final class PosixEventDriverEvents(Loop : PosixEventLoop) : EventDriverEvents {
+@safe: /*@nogc:*/ nothrow:
+	private Loop m_loop;
+
+	this(Loop loop) { m_loop = loop; }
+
 	final override EventID create()
 	{
 		auto id = cast(EventID)eventfd(0, EFD_NONBLOCK);
-		initFD(id);
-		m_fds[id].waiters = new ConsumableQueue!EventCallback; // FIXME: avoid dynamic memory allocation
-		registerFD(id, EventMask.read);
-		startNotify!(EventType.read)(id, &onEvent);
+		m_loop.initFD(id);
+		m_loop.m_fds[id].waiters = new ConsumableQueue!EventCallback; // FIXME: avoid dynamic memory allocation
+		m_loop.registerFD(id, EventMask.read);
+		m_loop.startNotify!(EventType.read)(id, &onEvent);
 		return id;
 	}
 
 	final override void trigger(EventID event, bool notify_all = true)
 	{
-		assert(event < m_fds.length, "Invalid event ID passed to triggerEvent.");
+		assert(event < m_loop.m_fds.length, "Invalid event ID passed to triggerEvent.");
 		if (notify_all) {
 			//log("emitting only for this thread (%s waiters)", m_fds[event].waiters.length);
-			foreach (w; m_fds[event].waiters.consume) {
+			foreach (w; m_loop.m_fds[event].waiters.consume) {
 				//log("emitting waiter %s %s", cast(void*)w.funcptr, w.ptr);
 				w(event);
 			}
 		} else {
-			if (!m_fds[event].waiters.empty)
-				m_fds[event].waiters.consumeOne();
+			if (!m_loop.m_fds[event].waiters.empty)
+				m_loop.m_fds[event].waiters.consumeOne();
 		}
 	}
 
 	final override void trigger(EventID event, bool notify_all = true)
 	shared @trusted {
 		import core.atomic : atomicStore;
-		auto thisus = cast(PosixEventDriver)this;
-		assert(event < thisus.m_fds.length, "Invalid event ID passed to shared triggerEvent.");
+		auto thisus = cast(PosixEventDriverEvents)this;
+		assert(event < thisus.m_loop.m_fds.length, "Invalid event ID passed to shared triggerEvent.");
 		long one = 1;
 		//log("emitting for all threads");
-		if (notify_all) atomicStore(thisus.m_fds[event].triggerAll, true);
+		if (notify_all) atomicStore(thisus.m_loop.m_fds[event].triggerAll, true);
 		() @trusted { .write(event, &one, one.sizeof); } ();
 	}
 
 	final override void wait(EventID event, EventCallback on_event)
 	{
-		assert(event < m_fds.length, "Invalid event ID passed to waitForEvent.");
-		return m_fds[event].waiters.put(on_event);
+		assert(event < m_loop.m_fds.length, "Invalid event ID passed to waitForEvent.");
+		return m_loop.m_fds[event].waiters.put(on_event);
 	}
 
 	final override void cancelWait(EventID event, EventCallback on_event)
@@ -731,7 +800,7 @@ abstract class PosixEventDriver : EventDriver,
 		import std.algorithm.searching : countUntil;
 		import std.algorithm.mutation : remove;
 
-		m_fds[event].waiters.removePending(on_event);
+		m_loop.m_fds[event].waiters.removePending(on_event);
 	}
 
 	private void onEvent(FD event)
@@ -739,26 +808,32 @@ abstract class PosixEventDriver : EventDriver,
 		ulong cnt;
 		() @trusted { .read(event, &cnt, cnt.sizeof); } ();
 		import core.atomic : cas;
-		auto all = cas(&m_fds[event].triggerAll, true, false);
+		auto all = cas(&m_loop.m_fds[event].triggerAll, true, false);
 		trigger(cast(EventID)event, all);
 	}
 
 	final override void addRef(EventID descriptor)
 	{
-		assert(m_fds[descriptor].refCount > 0, "Adding reference to unreferenced event FD.");
-		m_fds[descriptor].refCount++;
+		assert(m_loop.m_fds[descriptor].refCount > 0, "Adding reference to unreferenced event FD.");
+		m_loop.m_fds[descriptor].refCount++;
 	}
 
 	final override void releaseRef(EventID descriptor)
 	{
-		assert(m_fds[descriptor].refCount > 0, "Releasing reference to unreferenced event FD.");
-		if (--m_fds[descriptor].refCount == 0) {
-			unregisterFD(descriptor);
-			clearFD(descriptor);
+		assert(m_loop.m_fds[descriptor].refCount > 0, "Releasing reference to unreferenced event FD.");
+		if (--m_loop.m_fds[descriptor].refCount == 0) {
+			m_loop.unregisterFD(descriptor);
+			m_loop.clearFD(descriptor);
 			close(descriptor);
 		}
 	}
+}
 
+final class PosixEventDriverSignals(Loop : PosixEventLoop) : EventDriverSignals {
+@safe: /*@nogc:*/ nothrow:
+	private Loop m_loop;
+
+	this(Loop loop) { m_loop = loop; }
 
 	final override void wait(int sig, SignalCallback on_signal)
 	{
@@ -769,6 +844,13 @@ abstract class PosixEventDriver : EventDriver,
 	{
 		assert(false, "TODO!");
 	}
+}
+
+final class PosixEventDriverWatchers(Loop : PosixEventLoop) : EventDriverWatchers {
+@safe: /*@nogc:*/ nothrow:
+	private Loop m_loop;
+
+	this(Loop loop) { m_loop = loop; }
 
 	final override WatcherID watchDirectory(string path, bool recursive)
 	{
@@ -794,22 +876,24 @@ abstract class PosixEventDriver : EventDriver,
 	{
 		assert(false, "TODO!");
 	}
-
-	final override void* rawUserData(StreamSocketFD descriptor, size_t size, DataInitializer initialize, DataInitializer destroy)
-	@system {
-		FDSlot* fds = &m_fds[descriptor];
-		assert(fds.userDataDestructor is null || fds.userDataDestructor is destroy,
-			"Requesting user data with differing type (destructor).");
-		assert(size <= FDSlot.userData.length, "Requested user data is too large.");
-		if (size > FDSlot.userData.length) assert(false);
-		if (!fds.userDataDestructor) {
-			initialize(fds.userData.ptr);
-			fds.userDataDestructor = destroy;
-		}
-		return m_fds[descriptor].userData.ptr;
 }
 
 
+package class PosixEventLoop {
+@safe: nothrow:
+	import core.time : Duration;
+
+	package {
+		ChoppedVector!FDSlot m_fds;
+		size_t m_waiterCount = 0;
+	}
+
+	protected @property int maxFD() const { return cast(int)m_fds.length; }
+
+	protected abstract void dispose();
+
+	protected abstract bool doProcessEvents(Duration dur);
+
 	/// Registers the FD for general notification reception.
 	protected abstract void registerFD(FD fd, EventMask mask);
 	/// Unregisters the FD for general notification reception.
@@ -817,6 +901,13 @@ abstract class PosixEventDriver : EventDriver,
 	/// Updates the event mask to use for listening for notifications.
 	protected abstract void updateFD(FD fd, EventMask mask);
 
+	final protected void notify(EventType evt)(FD fd)
+	{
+		//assert(m_fds[fd].callback[evt] !is null, "Notifying FD which is not listening for event.");
+		if (m_fds[fd].callback[evt])
+			m_fds[fd].callback[evt](fd);
+	}
+
 	final protected void enumerateFDs(EventType evt)(scope FDEnumerateCallback del)
 	{
 		// TODO: optimize!
@@ -825,14 +916,7 @@ abstract class PosixEventDriver : EventDriver,
 				del(cast(FD)i);
 	}
 
-	final protected void notify(EventType evt)(FD fd)
-	{
-		//assert(m_fds[fd].callback[evt] !is null, "Notifying FD which is not listening for event.");
-		if (m_fds[fd].callback[evt])
-			m_fds[fd].callback[evt](fd);
-	}
-
-	private void startNotify(EventType evt)(FD fd, FDSlotCallback callback)
+	package void startNotify(EventType evt)(FD fd, FDSlotCallback callback)
 	{
 		//log("start notify %s %s", evt, fd);
 		//assert(m_fds[fd].callback[evt] is null, "Waiting for event which is already being waited for.");
@@ -840,7 +924,7 @@ abstract class PosixEventDriver : EventDriver,
 		updateFD(fd, m_fds[fd].eventMask);
 	}
 
-	private void stopNotify(EventType evt)(FD fd)
+	package void stopNotify(EventType evt)(FD fd)
 	{
 		//log("stop notify %s %s", evt, fd);
 		//ssert(m_fds[fd].callback[evt] !is null, "Stopping waiting for event which is not being waited for.");
@@ -848,7 +932,7 @@ abstract class PosixEventDriver : EventDriver,
 		updateFD(fd, m_fds[fd].eventMask);
 	}
 
-	private void setNotifyCallback(EventType evt)(FD fd, FDSlotCallback callback)
+	package void setNotifyCallback(EventType evt)(FD fd, FDSlotCallback callback)
 	{
 		assert((callback !is null) != (m_fds[fd].callback[evt] !is null),
 			"Overwriting notification callback.");
@@ -863,21 +947,12 @@ abstract class PosixEventDriver : EventDriver,
 		m_fds[fd].callback[evt] = callback;
 	}
 
-	private SocketFD createSocket(AddressFamily family, int type)
-	{
-		int sock;
-		() @trusted { sock = socket(family, type, 0); } ();
-		if (sock == -1) return SocketFD.invalid;
-		setSocketNonBlocking(cast(SocketFD)sock);
-		return cast(SocketFD)sock;
-	}
-
-	private void initFD(FD fd)
+	package void initFD(FD fd)
 	{
 		m_fds[fd].refCount = 1;
 	}
 
-	private void clearFD(FD fd)
+	package void clearFD(FD fd)
 	{
 		if (m_fds[fd].userDataDestructor)
 			() @trusted { m_fds[fd].userDataDestructor(m_fds[fd].userData.ptr); } ();
@@ -889,6 +964,7 @@ abstract class PosixEventDriver : EventDriver,
 	}
 }
 
+
 alias FDEnumerateCallback = void delegate(FD);
 
 alias FDSlotCallback = void delegate(FD);

source/eventcore/drivers/select.d

@@ -23,14 +23,8 @@ version (Windows) {
 }
 
 
-final class SelectEventDriver : PosixEventDriver {
-	override @property SelectEventDriver core() { return this; }
-	override @property SelectEventDriver sockets() { return this; }
-	override @property SelectEventDriver timers() { return this; }
-	override @property SelectEventDriver events() { return this; }
-	override @property SelectEventDriver signals() { return this; }
-	override @property SelectEventDriver watchers() { return this; }
-
+final class SelectEventLoop : PosixEventLoop {
+@safe: nothrow:
 	override bool doProcessEvents(Duration timeout)
 	{
 		//assert(Fiber.getThis() is null, "processEvents may not be called from within a fiber!");
@@ -74,7 +68,6 @@ final class SelectEventDriver : PosixEventDriver {
 
 	override void dispose()
 	{
-		super.dispose();
 	}
 
 	override void registerFD(FD fd, EventMask mask)

source/eventcore/drivers/timer.d

@@ -6,7 +6,7 @@ module eventcore.drivers.timer;
 import eventcore.driver;
 
 
-mixin template DefaultTimerImpl() {
+final class LoopTimeoutTimerDriver : EventDriverTimers {
 	import std.experimental.allocator.building_blocks.free_list;
 	import std.experimental.allocator.building_blocks.region;
 	import std.experimental.allocator.mallocator;
@@ -29,12 +29,12 @@ mixin template DefaultTimerImpl() {
 		ms_allocator.parent = Mallocator.instance;
 	}
 
-	final protected Duration getNextTimeout(long stdtime)
-	{
+	final package Duration getNextTimeout(long stdtime)
+	@safe nothrow {
 		return m_timerQueue.length ? (m_timerQueue.front.timeout - stdtime).hnsecs : Duration.max;
 	}
 
-	final protected bool processTimers(long stdtime)
+	final package bool process(long stdtime)
 	@trusted nothrow {
 		assert(m_firedTimers.length == 0);
 		if (m_timerQueue.empty) return false;
@@ -48,7 +48,7 @@ mixin template DefaultTimerImpl() {
 				while (tm.timeout <= stdtime);
 				auto tail = m_timerQueue[fired.length .. $].assumeSorted!((a, b) => a.timeout < b.timeout).upperBound(tm);
 				try m_timerQueue.insertBefore(tail.release, tm);
-				catch (Exception e) { print("Failed to insert timer: %s", e.msg); }
+				catch (Exception e) { assert(false, e.msg); }
 			} else tm.pending = false;
 			m_firedTimers ~= tm;
 		}
@@ -94,7 +94,7 @@ mixin template DefaultTimerImpl() {
 
 		auto largerRange = m_timerQueue[].assumeSorted!((a, b) => a.timeout < b.timeout).upperBound(tm);
 		try m_timerQueue.insertBefore(largerRange.release, tm);
-		catch (Exception e) { print("Failed to insert timer: %s", e.msg); }
+		catch (Exception e) { assert(false, e.msg); }
 	}
 
 	final override void stop(TimerID timer)