Map does not support declaring as a global variable

[fgvcbv]

When I declare map as a global variable, it prompts that the atexit function is an unresolved external symbol

[jxy-s]

https://github.com/jxy-s/stlkrn/blob/main/README.md#msvc-c-stl-support---jxystl

CRT initialization and atexit functionality is intentionally not supported. Order of CRT initialization is unclear and non-obvious. When a kernel driver loads global data should be clearly setup and torn down during driver load and unload. Global CRT initialization "hides" this initialization in a non-obvious way. Further, CRT atexit functionality is not supported. Emission of necessary synchronization enabling local static initialization of C++ objects is not done by the compiler. And would introduces non-obvious synchronization in the kernel. Lack of CRT initialization and atexit support is an intentional design decision. I strongly recommend avoiding it when developing kernel drivers.

[fgvcbv]

Sorry, I am a beginner. Thank you for your patient guidance. May I ask if there is a good way to declare a global variable map for multiple threads to use

[jxy-s]

There is a good example in the project here:

stlkrn/stlkrn/process_map.cpp

Lines 11 to 43 in 26af6fc

	namespace jxy
	{
	//
	// This is the global process map singleton. It is allocated/generated and torn
	// down during load and unload of the driver. It should be accessed by the
	// public jxy::GetProcessMap function.
	//
	static jxy::ProcessMap* g_ProcessMap = nullptr;
	}
	jxy::ProcessMap& jxy::GetProcessMap()
	{
	NT_ASSERT(g_ProcessMap != nullptr);
	return *g_ProcessMap;
	}
	NTSTATUS jxy::AllocateProcessMap() try
	{
	NT_ASSERT(g_ProcessMap == nullptr);
	auto procMap = jxy::make_unique<ProcessMap,
	PagedPool,
	PoolTags::ProcessMap>();
	g_ProcessMap = procMap.release();
	return STATUS_SUCCESS;
	}
	catch (const std::bad_alloc&)
	{
	return STATUS_INSUFFICIENT_RESOURCES;
	}