added preliminary shared memory physics client/server

fix a bug in CommonMultiBodyBase: don't use data if it hasn't been allocated

examples/SharedMemory/main.cpp

@@ -0,0 +1,54 @@
+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2015 Google Inc. http://bulletphysics.org
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose, 
+including commercial applications, and to alter it and redistribute it freely, 
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+
+
+#include "PhysicsServer.h"
+#include "PhysicsClient.h"
+#include "Bullet3Common/b3CommandLineArgs.h"
+
+#include "../CommonInterfaces/CommonExampleInterface.h"
+#include "../CommonInterfaces/CommonGUIHelperInterface.h"
+
+
+
+
+int main(int argc, char* argv[])
+{
+
+	b3CommandLineArgs args(argc, argv);
+	struct PhysicsInterface* pint = 0;
+	
+	DummyGUIHelper noGfx;
+
+	CommonExampleOptions options(&noGfx);
+	CommonExampleInterface*    example = 0;
+
+  	if (args.CheckCmdLineFlag("client"))
+        {
+		example = PhysicsClientCreateFunc(options);
+        }else
+        {
+		example = PhysicsServerCreateFunc(options);
+        }
+	
+	example->initPhysics();
+	example->stepSimulation(1.f/60.f);
+	example->exitPhysics();
+
+	delete example;
+
+	return 0;
+}
+