Allow InProcessExampleBrowser to use a malloc allocated memory block, instead of system shared memory.

Make shared memory client/server a bit more robust, in case the server is terminated early.

examples/SharedMemory/InProcessMemory.cpp

@@ -0,0 +1,49 @@
+#include "InProcessMemory.h"
+
+
+#include "LinearMath/btHashMap.h"
+
+struct InProcessMemoryInternalData
+{
+	btHashMap<btHashInt, void*> m_memoryPointers;
+
+};
+
+
+InProcessMemory::InProcessMemory()
+{
+	m_data = new InProcessMemoryInternalData;
+}
+
+InProcessMemory::~InProcessMemory()
+{
+	for (int i=0;i<m_data->m_memoryPointers.size();i++)
+	{
+		void** ptrptr = m_data->m_memoryPointers.getAtIndex(i);
+		if (ptrptr)
+		{
+			void* ptr = *ptrptr;
+			free(ptr);
+		}
+	}
+	delete m_data;
+}
+
+void*	InProcessMemory::allocateSharedMemory(int key, int size, bool allowCreation)
+{
+	void** ptrptr = m_data->m_memoryPointers[key];
+	if (ptrptr)
+	{
+		return *ptrptr;
+	}
+
+	void* ptr = malloc(size);
+	m_data->m_memoryPointers.insert(key,ptr);
+	return ptr;
+}
+
+void	InProcessMemory::releaseSharedMemory(int /*key*/, int /*size*/)
+{
+	//we don't release the memory here, but in the destructor instead,
+	//so multiple users could 'share' the memory given some key
+}