#ifndef _NTRTL_H
#if (PHNT_VERSION >= PHNT_WINDOWS_11)
//
// Read-Copy-Update (RCU).
//
// RCU synchronization allows concurrent access to shared data structures,
// such as linked lists, trees, or hash tables, without using traditional locking methods
// in scenarios where read operations are frequent and need to be fast.
// It is particularly useful in multi-threaded environments where multiple threads
// may read from the same data structure while one or more threads may modify it.
// @remarks RCU synchronization is not for general-purpose synchronization.
// Teb->Rcu is used to store the RCU state.
#if defined(PHNT_NATIVE_RCU)

typedef struct _RTL_RCU_COOKIE
{
    ULONG_PTR ThreadEntryOrNull; // NULL => slow-path SRW shared lock was used
} RTL_RCU_COOKIE, *PRTL_RCU_COOKIE;

#endif
#endif
#endif
View code on GitHub

#ifndef _NTRTL_H
#if (PHNT_VERSION >= PHNT_WINDOWS_11)
//
// Read-Copy-Update (RCU).
//
// RCU synchronization allows concurrent access to shared data structures,
// such as linked lists, trees, or hash tables, without using traditional locking methods
// in scenarios where read operations are frequent and need to be fast.
// It is particularly useful in multi-threaded environments where multiple threads
// may read from the same data structure while one or more threads may modify it.
// @remarks RCU synchronization is not for general-purpose synchronization.
// Teb->Rcu is used to store the RCU state.
#if defined(PHNT_NATIVE_RCU)
// ...
#else

typedef ULONG_PTR RTL_RCU_COOKIE, *PRTL_RCU_COOKIE;

#endif
#endif
#endif
View code on GitHub