diff --git a/src/Nazara/Core/Posix/ClockImpl.cpp b/src/Nazara/Core/Posix/ClockImpl.cpp
index 3bd944b63..61590c159 100644
--- a/src/Nazara/Core/Posix/ClockImpl.cpp
+++ b/src/Nazara/Core/Posix/ClockImpl.cpp
@@ -17,12 +17,12 @@ nzUInt64 NzClockImplGetMicroseconds()
 {
 	timeval clock;
 	gettimeofday(&clock, nullptr);
-	return static_cast<nzUInt64>(clock.tv_sec*1000000 + (clock.tv_nsec/1000));
+	return static_cast<nzUInt64>(clock.tv_sec*1000000 + clock.tv_usec);
 }
 
 nzUInt64 NzClockImplGetMilliseconds()
 {
 	timeval clock;
 	gettimeofday(&clock, nullptr);
-	return static_cast<nzUInt64>(clock.tv_sec*1000 + (clock.tv_nsec/1000000));
+	return static_cast<nzUInt64>(clock.tv_sec*1000 + (clock.tv_usec/1000));
 }
diff --git a/src/Nazara/Core/Posix/ConditionVariableImpl.cpp b/src/Nazara/Core/Posix/ConditionVariableImpl.cpp
index b5ae36333..2b4da8ff8 100644
--- a/src/Nazara/Core/Posix/ConditionVariableImpl.cpp
+++ b/src/Nazara/Core/Posix/ConditionVariableImpl.cpp
@@ -28,7 +28,7 @@ void NzConditionVariableImpl::SignalAll()
 
 void NzConditionVariableImpl::Wait(NzMutexImpl* mutex)
 {
-	pthread_cond_wait(&m_cv, mutex);
+	pthread_cond_wait(&m_cv, &mutex->m_handle);
 }
 
 bool NzConditionVariableImpl::Wait(NzMutexImpl* mutex, nzUInt32 timeout)
diff --git a/src/Nazara/Core/Posix/DirectoryImpl.cpp b/src/Nazara/Core/Posix/DirectoryImpl.cpp
index c4fc18d0c..bacf2e5b3 100644
--- a/src/Nazara/Core/Posix/DirectoryImpl.cpp
+++ b/src/Nazara/Core/Posix/DirectoryImpl.cpp
@@ -18,20 +18,24 @@ void NzDirectoryImpl::Close()
 
 NzString NzDirectoryImpl::GetResultName() const
 {
-	return m_result.d_name;
+	return m_result->d_name;
 }
 
 nzUInt64 NzDirectoryImpl::GetResultSize() const
 {
 	struct stat64 resulststat;
-	stat64(m_result.d_name, &resulststat);
+	stat64(m_result->d_name, &resulststat);
 
 	return static_cast<nzUInt64>(resulststat.st_size);
 }
 
 bool NzDirectoryImpl::IsResultDirectory() const
 {
-	return S_ISDIR(m_result.d_name);
+    struct stat64 filestats;
+    if (stat64(m_result->d_name, &filestats) == -1) // error
+        return false;
+
+	return S_ISDIR(filestats.st_mode);
 }
 
 bool NzDirectoryImpl::NextResult()
@@ -68,10 +72,11 @@ bool NzDirectoryImpl::Create(const NzString& dirPath)
 
 bool NzDirectoryImpl::Exists(const NzString& dirPath)
 {
-	if (S_ISDIR(dirPath.GetConstBuffer()))
-		return true;
+    struct stat64 filestats;
+    if (stat64(dirPath.GetConstBuffer(), &filestats) == -1) // error
+        return false;
 
-	return false;
+	return S_ISDIR(filestats.st_mode) || S_ISREG(filestats.st_mode);
 }
 
 NzString NzDirectoryImpl::GetCurrent()
diff --git a/src/Nazara/Core/Posix/FileImpl.cpp b/src/Nazara/Core/Posix/FileImpl.cpp
index 523c5b98e..22b6e3a38 100644
--- a/src/Nazara/Core/Posix/FileImpl.cpp
+++ b/src/Nazara/Core/Posix/FileImpl.cpp
@@ -4,7 +4,6 @@
 
 #include <Nazara/Core/Posix/FileImpl.hpp>
 #include <Nazara/Core/Error.hpp>
-#include <Nazara/Core/Posix/Time.hpp>
 #include <Nazara/Core/Debug.hpp>
 #include <stdio.h>
 #include <unistd.h>
@@ -26,7 +25,7 @@ bool NzFileImpl::EndOfFile() const
 {
 	if (!m_endOfFileUpdated)
 	{
-		stat64 fileSize;
+		struct stat64 fileSize;
 		if (fstat64(m_fileDescriptor, &fileSize) == -1)
 			fileSize.st_size = 0;
 
@@ -192,7 +191,7 @@ bool NzFileImpl::Delete(const NzString& filePath)
 
 bool NzFileImpl::Exists(const NzString& filePath)
 {
-	char* path = filePath.GetConstBuffer();
+	const char* path = filePath.GetConstBuffer();
 	if (access(path, F_OK) != -1)
 		return true;
 
diff --git a/src/Nazara/Core/Posix/MutexImpl.cpp b/src/Nazara/Core/Posix/MutexImpl.cpp
index a4844cd37..eb57e5783 100644
--- a/src/Nazara/Core/Posix/MutexImpl.cpp
+++ b/src/Nazara/Core/Posix/MutexImpl.cpp
@@ -12,20 +12,20 @@ NzMutexImpl::NzMutexImpl()
 
 NzMutexImpl::~NzMutexImpl()
 {
-	pthread_mutex_destroy(m_handle);
+	pthread_mutex_destroy(&m_handle);
 }
 
 void NzMutexImpl::Lock()
 {
-	pthread_mutex_lock(m_handle);
+	pthread_mutex_lock(&m_handle);
 }
 
 bool NzMutexImpl::TryLock()
 {
-	return pthread_mutex_trylock(m_handle) == 0;
+	return pthread_mutex_trylock(&m_handle) == 0;
 }
 
 void NzMutexImpl::Unlock()
 {
-	pthread_mutex_unlock(m_handle);
+	pthread_mutex_unlock(&m_handle);
 }
diff --git a/src/Nazara/Core/Posix/SemaphoreImpl.cpp b/src/Nazara/Core/Posix/SemaphoreImpl.cpp
index ad94b6218..51812579a 100644
--- a/src/Nazara/Core/Posix/SemaphoreImpl.cpp
+++ b/src/Nazara/Core/Posix/SemaphoreImpl.cpp
@@ -7,11 +7,11 @@
 #include <Nazara/Core/Error.hpp>
 #include <limits>
 #include <Nazara/Core/Debug.hpp>
+#include <sys/time.h>
 
 NzSemaphoreImpl::NzSemaphoreImpl(unsigned int count)
 {
-	m_semaphore = sem_init(&m_semaphore, 0, count);
-	if (!m_semaphore)
+	if(sem_init(&m_semaphore, 0, count) != 0)
 		NazaraError("Failed to create semaphore: " + NzGetLastSystemError());
 }
 
@@ -22,8 +22,8 @@ NzSemaphoreImpl::~NzSemaphoreImpl()
 
 unsigned int NzSemaphoreImpl::GetCount() const
 {
-	int count;
-	sem_getvalue(&m_semaphore, &count);
+	int count=0;
+	sem_getvalue(const_cast<sem_t*>(&m_semaphore), &count);
 	return static_cast<unsigned int>(count);
 }
 
@@ -49,13 +49,16 @@ void NzSemaphoreImpl::Wait()
 
 bool NzSemaphoreImpl::Wait(nzUInt32 timeout)
 {
+    timeval tv;
+    gettimeofday(&tv, nullptr);
+
 	timespec ti;
 	ti.tv_nsec = (tv.tv_usec + (timeout % 1000)) * 1000000;
 	ti.tv_sec = tv.tv_sec + (timeout / 1000) + (ti.tv_nsec / 1000000000);
 	ti.tv_nsec %= 1000000000;
 
 	#if NAZARA_CORE_SAFE
-	if (sem_timedwait(m_semaphore, timeout) == -1)
+	if (sem_timedwait(&m_semaphore, &ti) != 0)
 	{
 		NazaraError("Failed to wait for semaphore: " + NzGetLastSystemError());
 		return false;
@@ -63,6 +66,6 @@ bool NzSemaphoreImpl::Wait(nzUInt32 timeout)
 
 	return true;
 	#else
-		return sem_timedwait(&m_semaphore, ti) == 0 && errno != ETIMEDOUT;
+		return sem_timedwait(&m_semaphore, &ti) != 0;
 	#endif
 }
diff --git a/src/Nazara/Core/Posix/ThreadImpl.cpp b/src/Nazara/Core/Posix/ThreadImpl.cpp
index fd0e0d2af..ddc6df1d3 100644
--- a/src/Nazara/Core/Posix/ThreadImpl.cpp
+++ b/src/Nazara/Core/Posix/ThreadImpl.cpp
@@ -5,7 +5,6 @@
 #include <Nazara/Core/Posix/ThreadImpl.hpp>
 #include <Nazara/Core/Error.hpp>
 #include <Nazara/Core/Functor.hpp>
-#include <process.h>
 #include <unistd.h>
 #include <sys/time.h>
 #include <Nazara/Core/Debug.hpp>
@@ -27,13 +26,13 @@ void NzThreadImpl::Join()
 	pthread_join(m_handle, nullptr);
 }
 
-unsigned int NzThreadImpl::ThreadProc(void* userdata)
+void* NzThreadImpl::ThreadProc(void* userdata)
 {
 	NzFunctor* func = static_cast<NzFunctor*>(userdata);
 	func->Run();
 	delete func;
 
-	return 0;
+	return nullptr;
 }
 
 void NzThreadImpl::Sleep(nzUInt32 time)
@@ -48,7 +47,7 @@ void NzThreadImpl::Sleep(nzUInt32 time)
 
     // get the current time
     timeval tv;
-    gettimeofday(&tv, NULL);
+    gettimeofday(&tv, nullptr);
 
     // construct the time limit (current time + time to wait)
     timespec ti;
diff --git a/src/Nazara/Core/Posix/ThreadImpl.hpp b/src/Nazara/Core/Posix/ThreadImpl.hpp
index 2a57d021e..130c0f42d 100644
--- a/src/Nazara/Core/Posix/ThreadImpl.hpp
+++ b/src/Nazara/Core/Posix/ThreadImpl.hpp
@@ -23,7 +23,7 @@ class NzThreadImpl
 		static void Sleep(nzUInt32 time);
 
 	private:
-		static unsigned int ThreadProc(void* userdata);
+		static void* ThreadProc(void* userdata);
 
 		pthread_t m_handle;
 };