RtlCreateUserStack - NtDoc

#ifndef _NTRTL_H
#if (PHNT_VERSION >= PHNT_VISTA)

// private
NTSYSAPI
NTSTATUS
NTAPI
RtlCreateUserStack(
    _In_opt_ SIZE_T CommittedStackSize,
    _In_opt_ SIZE_T MaximumStackSize,
    _In_opt_ ULONG_PTR ZeroBits,
    _In_ SIZE_T PageSize,
    _In_ ULONG_PTR ReserveAlignment,
    _Out_ PINITIAL_TEB InitialTeb
    );

#endif
#endif
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