Use global shared variables in DLL

By default, DLL global variables are shared by non-process space. By default, it is only the global variable of the host process. It also means that each host Program has this copy. Therefore, this global variable cannot be shared by all processes, windows uses the copy-on-write mechanism for protection.

If you need to set a shared segment for sharing and place it in the shared segment, a host process changes its value. All processes can see the changed value, as shown in the following code:

# Pragma data_seg ("shared ")
Int g_share = 0;
# Pragma data_seg ()
# Pragma comment (linker, "/section: shared, RWS ")

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Haha ~ This method is simple