Windows threading: _beginthread vs _beginthreadex vs CreateThread C++

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CreateThread() is a raw Win32 API call for creating another thread of control at the kernel level.

_beginthread() & _beginthreadex() are C runtime library calls that call CreateThread() behind the scenes. Once CreateThread() has returned, _beginthread/ex() takes care of additional bookkeeping to make the C runtime library usable & consistent in the new thread.

In C++ you should almost certainly use _beginthreadex() unless you won’t be linking to the C runtime library at all (aka MSVCRT*.dll/.lib).

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