diff --git a/source/vibe/core/sync.d b/source/vibe/core/sync.d
index 9f164a3..57c5da9 100644
--- a/source/vibe/core/sync.d
+++ b/source/vibe/core/sync.d
@@ -19,6 +19,23 @@ import std.stdio;
 import std.traits : ReturnType;
 
 
+/** Creates a new signal that can be shared between fibers.
+*/
+ManualEvent createManualEvent()
+@safe {
+	return ManualEvent.init;
+}
+/// ditto
+shared(ManualEvent) createSharedManualEvent()
+@trusted {
+	return shared(ManualEvent).init;
+}
+
+ScopedMutexLock!M scopedMutexLock(M : Mutex)(M mutex, LockMode mode = LockMode.lock)
+{
+	return ScopedMutexLock!M(mutex, mode);
+}
+
 enum LockMode {
 	lock,
 	tryLock,
@@ -34,16 +51,16 @@ interface Lockable {
 
 /** RAII lock for the Mutex class.
 */
-struct ScopedMutexLock
+struct ScopedMutexLock(M : Mutex = core.sync.mutex.Mutex)
 {
 	@disable this(this);
 	private {
-		Mutex m_mutex;
+		M m_mutex;
 		bool m_locked;
 		LockMode m_mode;
 	}
 
-	this(core.sync.mutex.Mutex mutex, LockMode mode = LockMode.lock) {
+	this(M mutex, LockMode mode = LockMode.lock) {
 		assert(mutex !is null);
 		m_mutex = mutex;
 
@@ -121,6 +138,8 @@ unittest {
 */
 class LocalTaskSemaphore
 {
+@safe:
+
 	// requires a queue
 	import std.container.binaryheap;
 	import std.container.array;
@@ -190,7 +209,7 @@ class LocalTaskSemaphore
 		if (++m_seq == uint.max)
 			rewindSeq();
 		
-		m_waiters.insert(w);
+		() @trusted { m_waiters.insert(w); } ();
 		do w.signal.wait(); while (!tryLock());
 		// on resume:
 		destroy(w.signal);
@@ -204,7 +223,7 @@ class LocalTaskSemaphore
 		if (m_waiters.length > 0 && available > 0) {
 			ThreadWaiter w = m_waiters.front();
 			w.signal.emit(); // resume one
-			m_waiters.removeFront();
+			() @trusted { m_waiters.removeFront(); } ();
 		}
 	}
 
@@ -225,7 +244,7 @@ class LocalTaskSemaphore
 	}
 
 	private void rewindSeq()
-	{
+	@trusted {
 		Array!ThreadWaiter waiters = m_waiters.release();
 		ushort min_seq;
 		import std.algorithm : min;
@@ -257,6 +276,8 @@ class LocalTaskSemaphore
 	See_Also: InterruptibleTaskMutex, RecursiveTaskMutex, core.sync.mutex.Mutex
 */
 class TaskMutex : core.sync.mutex.Mutex, Lockable {
+@safe:
+
 	private TaskMutexImpl!false m_impl;
 
 	this(Object o) { m_impl.setup(); super(o); }
@@ -271,16 +292,16 @@ unittest {
 	auto mutex = new TaskMutex;
 
 	{
-		auto lock = ScopedMutexLock(mutex);
+		auto lock = scopedMutexLock(mutex);
 		assert(lock.locked);
 		assert(mutex.m_impl.m_locked);
 
-		auto lock2 = ScopedMutexLock(mutex, LockMode.tryLock);
+		auto lock2 = scopedMutexLock(mutex, LockMode.tryLock);
 		assert(!lock2.locked);
 	}
 	assert(!mutex.m_impl.m_locked);
 
-	auto lock = ScopedMutexLock(mutex, LockMode.tryLock);
+	auto lock = scopedMutexLock(mutex, LockMode.tryLock);
 	assert(lock.locked);
 	lock.unlock();
 	assert(!lock.locked);
@@ -296,7 +317,7 @@ unittest {
 	assert(!mutex.m_impl.m_locked);
 
 	static if (__VERSION__ >= 2067) {
-		with(mutex.ScopedMutexLock) {
+		with(mutex.scopedMutexLock) {
 			assert(mutex.m_impl.m_locked);
 		}
 	}
@@ -356,6 +377,8 @@ unittest {
 	See_Also: $(D TaskMutex), $(D InterruptibleRecursiveTaskMutex)
 */
 final class InterruptibleTaskMutex : Lockable {
+@safe:
+
 	private TaskMutexImpl!true m_impl;
 
 	this() { m_impl.setup(); }
@@ -390,6 +413,8 @@ unittest {
 	See_Also: TaskMutex, core.sync.mutex.Mutex
 */
 class RecursiveTaskMutex : core.sync.mutex.Mutex, Lockable {
+@safe:
+
 	private RecursiveTaskMutexImpl!false m_impl;
 
 	this(Object o) { m_impl.setup(); super(o); }
@@ -416,6 +441,8 @@ unittest {
 	See_Also: $(D RecursiveTaskMutex), $(D InterruptibleTaskMutex)
 */
 final class InterruptibleRecursiveTaskMutex : Lockable {
+@safe:
+
 	private RecursiveTaskMutexImpl!true m_impl;
 
 	this() { m_impl.setup(); }
@@ -551,6 +578,8 @@ private void runMutexUnitTests(M)()
 	See_Also: InterruptibleTaskCondition
 */
 class TaskCondition : core.sync.condition.Condition {
+@safe:
+
 	private TaskConditionImpl!(false, Mutex) m_impl;
 
 	this(core.sync.mutex.Mutex mtx) {
@@ -625,6 +654,8 @@ unittest {
 	See_Also: `TaskCondition`
 */
 final class InterruptibleTaskCondition {
+@safe:
+
 	private TaskConditionImpl!(true, Lockable) m_impl;
 
 	this(core.sync.mutex.Mutex mtx) { m_impl.setup(mtx); }
@@ -638,18 +669,6 @@ final class InterruptibleTaskCondition {
 }
 
 
-/** Creates a new signal that can be shared between fibers.
-*/
-ManualEvent createManualEvent()
-{
-	return ManualEvent.init;
-}
-/// ditto
-shared(ManualEvent) createSharedManualEvent()
-{
-	return shared(ManualEvent).init;
-}
-
 /** A manually triggered cross-task event.
 
 	Note: the ownership can be shared between multiple fibers and threads.
@@ -897,7 +916,7 @@ struct ManualEvent {
 					auto wnext = waiters.next;
 					assert(wnext !is waiters);
 					if (waiters.notifier !is null) {
-						logTrace("notify task %s %s %s", cast(void*)waiters, cast(void*)waiters.notifier.funcptr, waiters.notifier.ptr);
+						logTrace("notify task %s %s %s", cast(void*)waiters, () @trusted { return cast(void*)waiters.notifier.funcptr; } (), waiters.notifier.ptr);
 						waiters.notifier();
 						waiters.notifier = null;
 					} else logTrace("notify callback is null");
@@ -1607,6 +1626,8 @@ class TaskReadWriteMutex
  */
 class InterruptibleTaskReadWriteMutex
 {
+	@safe:
+
     private {
         alias State = ReadWriteMutexState!true;
         alias LockingIntent = State.LockingIntent;