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c++multithreadingdllstaticsharing
MrMartins
MrMartins

Reputation: 93

Is dll static var shared between threads that load the same dll?

here my issue. I have a mainApplication (c++ application) which launches K threads (c++ threads) at the application starts. Each thread has its own configuration. All k threads load the same Dll (myDll.dll) which has a static var X. Inside each thread, i have a function that prints the X address, and all threads print the same address value for X. So my question is: Is static var X, declared into Dll, shared between all threads? I use windows and c++. Kind regards.

Upvotes: 0

Views: 40

Answers (1)

Christian Stieber
Christian Stieber

Reputation: 12496

Yes. Read this: https://learn.microsoft.com/en-us/windows/win32/dlls/dynamic-link-library-data#variable-scope

Basically, threads are not isolated from each other in any way, shape or form -- all threads in a program operate on the same memory. This notion extends to DLLs as well.

Upvotes: 1

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