Duplicate source files for Vulkan.

The Vulkan implementation needs a directory for each architectural
layer, similar to the OpenGL ES stack. The entire rendering stack is
duplicated, leaving only Reactor common between them:

Renderer -> Device
Shader -> Pipeline
Common -> System
Main -> WSI

Bug b/117152542

Change-Id: I9c26b23654016d637f88ec2416f019ef65b9afbd
Reviewed-on: https://swiftshader-review.googlesource.com/c/21248
Reviewed-by: Alexis Hétu <sugoi@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
diff --git a/src/System/Thread.cpp b/src/System/Thread.cpp
new file mode 100644
index 0000000..df9a0b7
--- /dev/null
+++ b/src/System/Thread.cpp
@@ -0,0 +1,91 @@
+// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "Thread.hpp"
+
+namespace sw
+{
+	Thread::Thread(void (*threadFunction)(void *parameters), void *parameters)
+	{
+		Event init;
+		Entry entry = {threadFunction, parameters, &init};
+
+		#if defined(_WIN32)
+			handle = CreateThread(NULL, 1024 * 1024, startFunction, &entry, 0, NULL);
+		#else
+			pthread_create(&handle, NULL, startFunction, &entry);
+		#endif
+
+		init.wait();
+	}
+
+	Thread::~Thread()
+	{
+		join();   // Make threads exit before deleting them to not block here
+	}
+
+	void Thread::join()
+	{
+		if(!hasJoined)
+		{
+			#if defined(_WIN32)
+				WaitForSingleObject(handle, INFINITE);
+				CloseHandle(handle);
+			#else
+				pthread_join(handle, NULL);
+			#endif
+
+			hasJoined = true;
+		}
+	}
+
+	#if defined(_WIN32)
+		unsigned long __stdcall Thread::startFunction(void *parameters)
+		{
+			Entry entry = *(Entry*)parameters;
+			entry.init->signal();
+			entry.threadFunction(entry.threadParameters);
+			return 0;
+		}
+	#else
+		void *Thread::startFunction(void *parameters)
+		{
+			Entry entry = *(Entry*)parameters;
+			entry.init->signal();
+			entry.threadFunction(entry.threadParameters);
+			return nullptr;
+		}
+	#endif
+
+	Event::Event()
+	{
+		#if defined(_WIN32)
+			handle = CreateEvent(NULL, FALSE, FALSE, NULL);
+		#else
+			pthread_cond_init(&handle, NULL);
+			pthread_mutex_init(&mutex, NULL);
+			signaled = false;
+		#endif
+	}
+
+	Event::~Event()
+	{
+		#if defined(_WIN32)
+			CloseHandle(handle);
+		#else
+			pthread_cond_destroy(&handle);
+			pthread_mutex_destroy(&mutex);
+		#endif
+	}
+}