[Core] Added POSIX support (Experimental)

Thanks to Danman
I don't think it actually compile although tried my best to correct
code.


Former-commit-id: c3366c2c924f7392f4d46824dafca63ecf7f1fea

src/Nazara/Core/Posix/ConditionVariableImpl.cpp

@@ -0,0 +1,47 @@
+// Copyright (C) 2012 Alexandre Janniaux
+// This file is part of the "Nazara Engine - Core module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Core/Posix/ConditionVariableImpl.hpp>
+#include <Nazara/Core/Posix/MutexImpl.hpp>
+#include <Nazara/Core/Debug.hpp>
+
+NzConditionVariableImpl::NzConditionVariableImpl()
+{
+	pthread_cond_init(&m_cv, nullptr);
+}
+
+NzConditionVariableImpl::~NzConditionVariableImpl()
+{
+    pthread_cond_destroy(&m_cv);
+}
+
+void NzConditionVariableImpl::Signal()
+{
+    pthread_cond_signal(&m_cv);
+}
+
+void NzConditionVariableImpl::SignalAll()
+{
+    pthread_cond_broadcast(&m_cv);
+}
+
+void NzConditionVariableImpl::Wait(NzMutexImpl* mutex)
+{
+	pthread_cond_wait(&m_cv, mutex);
+}
+
+bool NzConditionVariableImpl::Wait(NzMutexImpl* mutex, nzUInt32 timeout)
+{
+    // get the current time
+    timeval tv;
+    gettimeofday(&tv, NULL);
+
+    // construct the time limit (current time + time to wait)
+    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;
+
+    pthread_cond_timedwait(&m_cv,mutex, &tv);
+}