diff --git a/Foundation/src/Event_POSIX.cpp b/Foundation/src/Event_POSIX.cpp
index ef67e22fd..4d7cd2367 100644
--- a/Foundation/src/Event_POSIX.cpp
+++ b/Foundation/src/Event_POSIX.cpp
@@ -19,6 +19,7 @@
 #include <timers.h>
 #include <cstring>
 #else
+#include <time.h>
 #include <sys/time.h>
 #endif
 
@@ -35,10 +36,37 @@ EventImpl::EventImpl(EventTypeImpl type): _auto(type == EVENT_AUTORESET_IMPL), _
 	// if the mutex has never been used.
 	std::memset(&_mutex, 0, sizeof(_mutex));
 #endif
+
 	if (pthread_mutex_init(&_mutex, NULL))
 		throw SystemException("cannot create event (mutex)");
-	if (pthread_cond_init(&_cond, NULL))
+
+#if defined(__linux__) || defined(__QNX__)
+	pthread_condattr_t attr;
+	if (pthread_condattr_init(&attr))
+	{
+		pthread_mutex_destroy(&_mutex);
+		throw SystemException("cannot create event (condition attribute)");
+	}
+	if (pthread_condattr_setclock(&attr, CLOCK_MONOTONIC))
+    {
+		pthread_condattr_destroy(&attr);
+		pthread_mutex_destroy(&_mutex);
+		throw SystemException("cannot create event (condition attribute clock)");
+    }
+	if (pthread_cond_init(&_cond, &attr))
+	{
+		pthread_condattr_destroy(&attr);
+		pthread_mutex_destroy(&_mutex);
 		throw SystemException("cannot create event (condition)");
+	}
+	pthread_condattr_destroy(&attr);
+#else
+	if (pthread_cond_init(&_cond, NULL))
+	{
+		pthread_mutex_destroy(&_mutex);
+		throw SystemException("cannot create event (condition)");
+	}
+#endif
 }
 
 
@@ -77,7 +105,16 @@ bool EventImpl::waitImpl(long milliseconds)
 	delta.tv_sec  = milliseconds / 1000;
 	delta.tv_nsec = (milliseconds % 1000)*1000000;
 	pthread_get_expiration_np(&delta, &abstime);
-#elif defined(POCO_VXWORKS)
+#elif defined(__linux__) || defined(__QNX__)
+	clock_gettime(CLOCK_MONOTONIC, &abstime);
+	abstime.tv_sec  += milliseconds / 1000;
+	abstime.tv_nsec += (milliseconds % 1000)*1000000;
+	if (abstime.tv_nsec >= 1000000000)
+	{
+		abstime.tv_nsec -= 1000000000;
+		abstime.tv_sec++;
+	}
+#elif (defined(_POSIX_TIMERS) && defined(CLOCK_REALTIME)) || defined(POCO_VXWORKS)
 	clock_gettime(CLOCK_REALTIME, &abstime);
 	abstime.tv_sec  += milliseconds / 1000;
 	abstime.tv_nsec += (milliseconds % 1000)*1000000;
diff --git a/Foundation/src/Mutex_POSIX.cpp b/Foundation/src/Mutex_POSIX.cpp
index b64d1c628..26c220383 100644
--- a/Foundation/src/Mutex_POSIX.cpp
+++ b/Foundation/src/Mutex_POSIX.cpp
@@ -73,6 +73,16 @@ bool MutexImpl::tryLockImpl(long milliseconds)
 {
 #if defined(POCO_HAVE_MUTEX_TIMEOUT)
 	struct timespec abstime;
+#if defined(_POSIX_TIMERS) && defined(CLOCK_REALTIME)
+	clock_gettime(CLOCK_REALTIME, &abstime);
+	abstime.tv_sec  += milliseconds / 1000;
+	abstime.tv_nsec += (milliseconds % 1000)*1000000;
+	if (abstime.tv_nsec >= 1000000000)
+	{
+		abstime.tv_nsec -= 1000000000;
+		abstime.tv_sec++;
+	}
+#else
 	struct timeval tv;
 	gettimeofday(&tv, NULL);
 	abstime.tv_sec  = tv.tv_sec + milliseconds / 1000;
@@ -82,6 +92,7 @@ bool MutexImpl::tryLockImpl(long milliseconds)
 		abstime.tv_nsec -= 1000000000;
 		abstime.tv_sec++;
 	}
+#endif
 	int rc = pthread_mutex_timedlock(&_mutex, &abstime);
 	if (rc == 0)
 		return true;
diff --git a/Foundation/src/Semaphore_POSIX.cpp b/Foundation/src/Semaphore_POSIX.cpp
index 1aa13035b..88e768ed1 100644
--- a/Foundation/src/Semaphore_POSIX.cpp
+++ b/Foundation/src/Semaphore_POSIX.cpp
@@ -19,6 +19,7 @@
 #include <timers.h>
 #include <cstring>
 #else
+#include <time.h>
 #include <sys/time.h>
 #endif
 
@@ -39,8 +40,34 @@ SemaphoreImpl::SemaphoreImpl(int n, int max): _n(n), _max(max)
 #endif
 	if (pthread_mutex_init(&_mutex, NULL))
 		throw SystemException("cannot create semaphore (mutex)");
-	if (pthread_cond_init(&_cond, NULL))
+
+#if defined(__linux__) || defined(__QNX__)
+	pthread_condattr_t attr;
+	if (pthread_condattr_init(&attr))
+	{
+		pthread_mutex_destroy(&_mutex);
+		throw SystemException("cannot create semaphore (condition attribute)");
+	}
+	if (pthread_condattr_setclock(&attr, CLOCK_MONOTONIC))
+    {
+		pthread_condattr_destroy(&attr);
+		pthread_mutex_destroy(&_mutex);
+		throw SystemException("cannot create semaphore (condition attribute clock)");
+    }
+	if (pthread_cond_init(&_cond, &attr))
+	{
+		pthread_condattr_destroy(&attr);
+		pthread_mutex_destroy(&_mutex);
 		throw SystemException("cannot create semaphore (condition)");
+	}
+	pthread_condattr_destroy(&attr);
+#else
+	if (pthread_cond_init(&_cond, NULL))
+	{
+		pthread_mutex_destroy(&_mutex);
+		throw SystemException("cannot create semaphore (condition)");
+	}
+#endif
 }
 
 
@@ -78,7 +105,16 @@ bool SemaphoreImpl::waitImpl(long milliseconds)
 	delta.tv_sec  = milliseconds / 1000;
 	delta.tv_nsec = (milliseconds % 1000)*1000000;
 	pthread_get_expiration_np(&delta, &abstime);
-#elif defined(POCO_VXWORKS)
+#elif defined(__linux__) || defined(__QNX__)
+	clock_gettime(CLOCK_MONOTONIC, &abstime);
+	abstime.tv_sec  += milliseconds / 1000;
+	abstime.tv_nsec += (milliseconds % 1000)*1000000;
+	if (abstime.tv_nsec >= 1000000000)
+	{
+		abstime.tv_nsec -= 1000000000;
+		abstime.tv_sec++;
+	}
+#elif (defined(_POSIX_TIMERS) && defined(CLOCK_REALTIME)) || defined(POCO_VXWORKS)
 	clock_gettime(CLOCK_REALTIME, &abstime);
 	abstime.tv_sec  += milliseconds / 1000;
 	abstime.tv_nsec += (milliseconds % 1000)*1000000;
diff --git a/Foundation/src/Timestamp.cpp b/Foundation/src/Timestamp.cpp
index b547be10b..3511d7d95 100644
--- a/Foundation/src/Timestamp.cpp
+++ b/Foundation/src/Timestamp.cpp
@@ -227,7 +227,7 @@ void Timestamp::update()
 	ts.QuadPart -= epoch.QuadPart;
 	_ts = ts.QuadPart/10;
 
-#elif defined(POCO_VXWORKS)
+#elif (defined(_POSIX_TIMERS) && defined(CLOCK_REALTIME)) || defined(POCO_VXWORKS) || defined(__QNX__)
 
 	struct timespec ts;
 	if (clock_gettime(CLOCK_REALTIME, &ts))