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<mutex>: std::mutex not declared when included from C++/CLI #980

Description

std::mutex is not declared by <mutex> when the header is included from C++/CLI.

I assume the reason for this is that the implementation is somehow incompatible with C++/CLI? Could this maybe be fixed by using #pragma managed(push, off) around problematic parts?

Even if this is not possible, the current solution has unfortunate side effects: We have a header that defines a C++ class that has a std::mutex as its member. Even though all interactions with that member are implemented in native code, C++/CLI code not interact with this class because the header doesn't compile under C++/CLI.

See also #838

Workaround: std::shared_mutex is available under C++/CLI.

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