RTL_RUN_ONCE_INIT_FN - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTRTL_H
#if (PHNT_VERSION >= PHNT_VISTA)

typedef _Function_class_(RTL_RUN_ONCE_INIT_FN)
LOGICAL 
NTAPI 
RTL_RUN_ONCE_INIT_FN(
    _Inout_ PRTL_RUN_ONCE RunOnce,
    _Inout_opt_ PVOID Parameter,
    _Inout_opt_ PVOID *Context
    );

#endif
#endif

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This callback function is documented in Windows Driver Kit.