System uses Create{Remote}Thread instead of _beginthread for callbacks like ServiceMain, RegisterServiceCtrlHandlerEx, HandlerRoutine (SetConsoleCtrlHandler), etc. Does it mean that it is unsafe to call statically linked CRT from these threads?
Calling CRT from system spawned thread
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In modern (UCRT based) runtime
_beginthread{ex}doesn't do any initialization. It only provide minor services like preventing module from unloading while thread is running and optionally initialize WinRT (RoInitialize).