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    <blockquote> <p>It is clear that the <code>thread_proxy</code> function is private internal and I do not expect that it would be mangled as "thread_proxy" because I actually do not need it mangled at all.</p> </blockquote> <p>Regardless, it's still going to be mangled. (Had it not been <code>extern "C"</code>) That's just how the compiler works. I agree it's conceivable a compiler could say "this doesn't necessarily need to be mangled", but the standard says nothing on it. That said, mangling doesn't come into play here, as we aren't trying to link to the function.</p> <blockquote> <p>In fact, in all my code that I had written and that runs on many platforms, I never used <code>extern "C"</code> and this had worked as-is with normal functions.</p> </blockquote> <p>Writing on different platforms has nothing to do with <code>extern "C"</code>. I expect all standard C++ code to work on all platforms that have a standard C++ compliant compiler.</p> <p><code>extern "C"</code> has to do with interfacing with C, which pthread is a library of. Not only does it not mangle the name, it makes sure it's callable with the C calling convention. It's the calling convention that needs to be guaranteed, and because we can't assume we are running on a certain compiler, platform, or architecture, the best way to try and do that is with the functionality given to us: <code>extern "C"</code>.</p> <blockquote> <p>My problem is that <code>extern "C"</code> functions pollute the global namespace and they are not actually hidden as the author expects.</p> </blockquote> <p>There's nothing polluting about the above code. It's in an unnamed namespace, and not accessible outside the translation unit.</p>
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    1. POWhy do you need "extern C" for C++ callbacks to C functions?
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    1. USJonathan Leffler
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    1. POWhy do you need "extern C" for C++ callbacks to C functions?
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    1. COCan you give a name of any platform/compiler where C plain function calling convention is not compatible on ABI level with C++ one? Because at least on Alpha, Itanium, ARM, X86, x86_64 it is.
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      1. USArtyom
    2. CO@Artyom: Not on x86. It's entirely possible that your compiler uses `__cdecl` on all extern "C" functions, but `__stdcall` otherwise. `__stdcall` produces more efficient (smaller) code but does not allow creation of varadic functions because the callee cleans the stack. Since `__cdecl` is the standard in most of the C world it makes sense to require that calling convention to external code.
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      1. USBilly ONeal
    3. COMangling does not enter the picture here. Mangling is only significant when *linking* against a function by name; here its address is passed directly as a parameter to other function.
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      1. USatzz
 

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