Implement EventDriverCore.runInOwnerThread.

source/eventcore/driver.d

@@ -20,6 +20,7 @@ module eventcore.driver;
 
 import core.time : Duration;
 import std.socket : Address;
+import std.stdint : intptr_t;
 
 
 /** Encapsulates a full event driver.
@@ -31,23 +32,25 @@ import std.socket : Address;
 interface EventDriver {
 @safe: /*@nogc:*/ nothrow:
 	/// Core event loop functionality
-	@property EventDriverCore core();
+	@property inout(EventDriverCore) core() inout;
+	/// Core event loop functionality
+	@property shared(inout(EventDriverCore)) core() shared inout;
 	/// Single shot and recurring timers
-	@property EventDriverTimers timers();
+	@property inout(EventDriverTimers) timers() inout;
 	/// Cross-thread events (thread local access)
-	@property EventDriverEvents events();
+	@property inout(EventDriverEvents) events() inout;
 	/// Cross-thread events (cross-thread access)
-	@property shared(EventDriverEvents) events() shared;
+	@property shared(inout(EventDriverEvents)) events() shared inout;
 	/// UNIX/POSIX signal reception
-	@property EventDriverSignals signals();
+	@property inout(EventDriverSignals) signals() inout;
 	/// Stream and datagram sockets
-	@property EventDriverSockets sockets();
+	@property inout(EventDriverSockets) sockets() inout;
 	/// DNS queries
-	@property EventDriverDNS dns();
+	@property inout(EventDriverDNS) dns() inout;
 	/// Local file operations
-	@property EventDriverFiles files();
+	@property inout(EventDriverFiles) files() inout;
 	/// Directory change watching
-	@property EventDriverWatchers watchers();
+	@property inout(EventDriverWatchers) watchers() inout;
 
 	/// Releases all resources associated with the driver
 	void dispose();
@@ -98,6 +101,10 @@ interface EventDriverCore {
 	*/
 	void clearExitFlag();
 
+	/** Executes a callback in the thread owning the driver.
+	*/
+	void runInOwnerThread(ThreadCallback del, intptr_t param) shared;
+
 	/// Low-level user data access. Use `getUserData` instead.
 	protected void* rawUserData(StreamSocketFD descriptor, size_t size, DataInitializer initialize, DataInitializer destroy) @system;
 	/// ditto
@@ -751,6 +758,8 @@ struct Handle(string NAME, T, T invalid_value = T.init) {
 	alias value this;
 }
 
+alias ThreadCallback = void function(intptr_t param) @safe nothrow;
+
 alias FD = Handle!("fd", size_t, size_t.max);
 alias SocketFD = Handle!("socket", FD);
 alias StreamSocketFD = Handle!("streamSocket", SocketFD);

source/eventcore/drivers/posix/driver.d

@@ -77,15 +77,16 @@ final class PosixEventDriver(Loop : PosixEventLoop) : EventDriver {
 	}
 
 	// force overriding these in the (final) sub classes to avoid virtual calls
-	final override @property CoreDriver core() { return m_core; }
+	final override @property inout(CoreDriver) core() inout { return m_core; }
-	final override @property EventsDriver events() { return m_events; }
+	final override @property shared(inout(CoreDriver)) core() shared inout { return m_core; }
-	final override @property shared(EventsDriver) events() shared { return m_events; }
+	final override @property inout(EventsDriver) events() inout { return m_events; }
-	final override @property SignalsDriver signals() { return m_signals; }
+	final override @property shared(inout(EventsDriver)) events() shared inout { return m_events; }
-	final override @property TimerDriver timers() { return m_timers; }
+	final override @property inout(SignalsDriver) signals() inout { return m_signals; }
-	final override @property SocketsDriver sockets() { return m_sockets; }
+	final override @property inout(TimerDriver) timers() inout { return m_timers; }
-	final override @property DNSDriver dns() { return m_dns; }
+	final override @property inout(SocketsDriver) sockets() inout { return m_sockets; }
-	final override @property FileDriver files() { return m_files; }
+	final override @property inout(DNSDriver) dns() inout { return m_dns; }
-	final override @property WatcherDriver watchers() { return m_watchers; }
+	final override @property inout(FileDriver) files() inout { return m_files; }
+	final override @property inout(WatcherDriver) watchers() inout { return m_watchers; }
 
 	final override void dispose()
 	{
@@ -100,8 +101,12 @@ final class PosixEventDriver(Loop : PosixEventLoop) : EventDriver {
 
 
 final class PosixEventDriverCore(Loop : PosixEventLoop, Timers : EventDriverTimers, Events : EventDriverEvents) : EventDriverCore {
-@safe: nothrow:
+@safe nothrow:
+	import core.atomic : atomicLoad, atomicStore;
+	import core.sync.mutex : Mutex;
 	import core.time : Duration;
+	import std.stdint : intptr_t;
+	import std.typecons : Tuple, tuple;
 
 	protected alias ExtraEventsCallback = bool delegate(long);
 
@@ -111,6 +116,9 @@ final class PosixEventDriverCore(Loop : PosixEventLoop, Timers : EventDriverTime
 		Events m_events;
 		bool m_exit = false;
 		EventID m_wakeupEvent;
+
+		shared Mutex m_threadCallbackMutex;
+		ConsumableQueue!(Tuple!(ThreadCallback, intptr_t)) m_threadCallbacks;
 	}
 
 	protected this(Loop loop, Timers timers, Events events)
@@ -119,12 +127,23 @@ final class PosixEventDriverCore(Loop : PosixEventLoop, Timers : EventDriverTime
 		m_timers = timers;
 		m_events = events;
 		m_wakeupEvent = events.createInternal();
+
+		static if (__VERSION__ >= 2074)
+			m_threadCallbackMutex = new shared Mutex;
+		else {
+			() @trusted { m_threadCallbackMutex = cast(shared)new Mutex; } ();
+		}
+
+		m_threadCallbacks = new ConsumableQueue!(Tuple!(ThreadCallback, intptr_t));
+		m_threadCallbacks.reserve(1000);
 	}
 
 	protected final void dispose()
 	{
+		executeThreadCallbacks();
 		m_events.releaseRef(m_wakeupEvent);
-		m_wakeupEvent = EventID.invalid;
+		atomicStore(m_threadCallbackMutex, null);
+		m_wakeupEvent = EventID.invalid; // FIXME: this needs to be synchronized!
 	}
 
 	@property size_t waiterCount() const { return m_loop.m_waiterCount + m_timers.pendingCount; }
@@ -133,6 +152,8 @@ final class PosixEventDriverCore(Loop : PosixEventLoop, Timers : EventDriverTime
 	{
 		import core.time : hnsecs, seconds;
 
+		executeThreadCallbacks();
+
 		if (m_exit) {
 			m_exit = false;
 			return ExitReason.exited;
@@ -160,6 +181,8 @@ final class PosixEventDriverCore(Loop : PosixEventLoop, Timers : EventDriverTime
 			} while (timeout > 0.seconds && !m_exit && !got_events);
 		}
 
+		executeThreadCallbacks();
+
 		if (m_exit) {
 			m_exit = false;
 			return ExitReason.exited;
@@ -173,7 +196,7 @@ final class PosixEventDriverCore(Loop : PosixEventLoop, Timers : EventDriverTime
 
 	final override void exit()
 	{
-		m_exit = true;
+		m_exit = true; // FIXME: this needs to be synchronized!
 		() @trusted { (cast(shared)m_events).trigger(m_wakeupEvent, true); } ();
 	}
 
@@ -182,6 +205,26 @@ final class PosixEventDriverCore(Loop : PosixEventLoop, Timers : EventDriverTime
 		m_exit = false;
 	}
 
+	final override void runInOwnerThread(ThreadCallback del, intptr_t param)
+	shared {
+		auto m = atomicLoad(m_threadCallbackMutex);
+		auto evt = atomicLoad(m_wakeupEvent);
+		// NOTE: This case must be handled gracefully to avoid hazardous
+		//       race-conditions upon unexpected thread termination. The mutex
+		//       and the map will stay valid even after the driver has been
+		//       disposed, so no further synchronization is required.
+		if (!m) return;
+
+		try {
+			synchronized (m)
+				() @trusted { return (cast()this).m_threadCallbacks; } ()
+					.put(tuple(del, param));
+		} catch (Exception e) assert(false, e.msg);
+
+		m_events.trigger(m_wakeupEvent, false);
+	}
+
+
 	final protected override void* rawUserData(StreamSocketFD descriptor, size_t size, DataInitializer initialize, DataInitializer destroy)
 	@system {
 		return rawUserDataImpl(descriptor, size, initialize, destroy);
@@ -196,6 +239,22 @@ final class PosixEventDriverCore(Loop : PosixEventLoop, Timers : EventDriverTime
 	@system {
 		return m_loop.rawUserDataImpl(descriptor, size, initialize, destroy);
 	}
+
+	private void executeThreadCallbacks()
+	{
+		import std.stdint : intptr_t;
+
+		while (true) {
+			Tuple!(ThreadCallback, intptr_t) del;
+			try {
+				synchronized (m_threadCallbackMutex) {
+					if (m_threadCallbacks.empty) break;
+					del = m_threadCallbacks.consumeOne;
+				}
+			} catch (Exception e) assert(false, e.msg);
+			del[0](del[1]);
+		}
+	}
 }
 
 

source/eventcore/drivers/winapi/core.d

@@ -7,8 +7,11 @@ import eventcore.drivers.timer;
 import eventcore.internal.consumablequeue;
 import eventcore.internal.utils : nogc_assert;
 import eventcore.internal.win32;
+import core.sync.mutex : Mutex;
 import core.time : Duration;
 import taggedalgebraic;
+import std.stdint : intptr_t;
+import std.typecons : Tuple, tuple;
 
 
 final class WinAPIEventDriverCore : EventDriverCore {
@@ -22,6 +25,9 @@ final class WinAPIEventDriverCore : EventDriverCore {
 		void delegate() @safe nothrow[HANDLE] m_eventCallbacks;
 		HANDLE m_fileCompletionEvent;
 		ConsumableQueue!IOEvent m_ioEvents;
+
+		shared Mutex m_threadCallbackMutex;
+		ConsumableQueue!(Tuple!(ThreadCallback, intptr_t)) m_threadCallbacks;
 	}
 
 	package {
@@ -35,6 +41,14 @@ final class WinAPIEventDriverCore : EventDriverCore {
 		m_fileCompletionEvent = () @trusted { return CreateEventW(null, false, false, null); } ();
 		registerEvent(m_fileCompletionEvent);
 		m_ioEvents = new ConsumableQueue!IOEvent;
+
+		static if (__VERSION__ >= 2074)
+			m_threadCallbackMutex = new shared Mutex;
+		else {
+			() @trusted { m_threadCallbackMutex = cast(shared)new Mutex; } ();
+		}
+		m_threadCallbacks = new ConsumableQueue!(Tuple!(ThreadCallback, intptr_t));
+		m_threadCallbacks.reserve(1000);
 	}
 
 	override size_t waiterCount() { return m_waiterCount + m_timers.pendingCount; }
@@ -98,6 +112,26 @@ final class WinAPIEventDriverCore : EventDriverCore {
 		m_exit = false;
 	}
 
+	override void runInOwnerThread(ThreadCallback del, intptr_t param)
+	shared {
+		import core.atomic : atomicLoad;
+
+		auto m = atomicLoad(m_threadCallbackMutex);
+		// NOTE: This case must be handled gracefully to avoid hazardous
+		//       race-conditions upon unexpected thread termination. The mutex
+		//       and the map will stay valid even after the driver has been
+		//       disposed, so no further synchronization is required.
+		if (!m) return;
+
+		try {
+			synchronized (m)
+				() @trusted { return (cast()this).m_threadCallbacks; } ()
+					.put(tuple(del, param));
+		} catch (Exception e) assert(false, e.msg);
+
+		() @trusted { PostThreadMessageW(m_tid, WM_APP, 0, 0); } ();
+	}
+
 	package void* rawUserDataImpl(HANDLE handle, size_t size, DataInitializer initialize, DataInitializer destroy)
 	@system {
 		HandleSlot* fds = &m_handles[handle];
@@ -127,6 +161,8 @@ final class WinAPIEventDriverCore : EventDriverCore {
 		import core.time : seconds;
 		import std.algorithm.comparison : min;
 
+		executeThreadCallbacks();
+
 		bool got_event;
 
 		if (max_wait > 0.seconds) {
@@ -173,6 +209,8 @@ final class WinAPIEventDriverCore : EventDriverCore {
 			//if (++cnt % 10 == 0) processTimers();
 		}
 
+		executeThreadCallbacks();
+
 		return got_event;
 	}
 
@@ -204,6 +242,22 @@ final class WinAPIEventDriverCore : EventDriverCore {
 		import std.algorithm.searching : canFind;
 		m_ioEvents.filterPending!(evt => !overlapped.canFind(evt.overlapped));
 	}
+
+	private void executeThreadCallbacks()
+	{
+		import std.stdint : intptr_t;
+
+		while (true) {
+			Tuple!(ThreadCallback, intptr_t) del;
+			try {
+				synchronized (m_threadCallbackMutex) {
+					if (m_threadCallbacks.empty) break;
+					del = m_threadCallbacks.consumeOne;
+				}
+			} catch (Exception e) assert(false, e.msg);
+			del[0](del[1]);
+		}
+	}
 }
 
 private long currStdTime()

source/eventcore/drivers/winapi/driver.d

@@ -60,15 +60,16 @@ final class WinAPIEventDriver : EventDriver {
 
 @safe: /*@nogc:*/ nothrow:
 
-	override @property WinAPIEventDriverCore core() { return m_core; }
+	override @property inout(WinAPIEventDriverCore) core() inout { return m_core; }
-	override @property WinAPIEventDriverFiles files() { return m_files; }
+	override @property shared(inout(WinAPIEventDriverCore)) core() inout shared { return m_core; }
-	override @property WinAPIEventDriverSockets sockets() { return m_sockets; }
+	override @property inout(WinAPIEventDriverFiles) files() inout { return m_files; }
-	override @property WinAPIEventDriverDNS dns() { return m_dns; }
+	override @property inout(WinAPIEventDriverSockets) sockets() inout { return m_sockets; }
-	override @property LoopTimeoutTimerDriver timers() { return m_timers; }
+	override @property inout(WinAPIEventDriverDNS) dns() inout { return m_dns; }
-	override @property WinAPIEventDriverEvents events() { return m_events; }
+	override @property inout(LoopTimeoutTimerDriver) timers() inout { return m_timers; }
-	override @property shared(WinAPIEventDriverEvents) events() shared { return m_events; }
+	override @property inout(WinAPIEventDriverEvents) events() inout { return m_events; }
-	override @property WinAPIEventDriverSignals signals() { return m_signals; }
+	override @property shared(inout(WinAPIEventDriverEvents)) events() inout shared { return m_events; }
-	override @property WinAPIEventDriverWatchers watchers() { return m_watchers; }
+	override @property inout(WinAPIEventDriverSignals) signals() inout { return m_signals; }
+	override @property inout(WinAPIEventDriverWatchers) watchers() inout { return m_watchers; }
 
 	override void dispose()
 	{