NtAlertMultipleThreadByThreadId - NtDoc

#ifndef _NTPSAPI_H
//
// Threads
//
#if (PHNT_MODE != PHNT_MODE_KERNEL)
#if (PHNT_VERSION >= PHNT_WIN11)

// rev
NTSYSCALLAPI
NTSTATUS
NTAPI
NtAlertMultipleThreadByThreadId(
    _In_ PHANDLE MultipleThreadId,
    _In_ ULONG Count,
    _In_ PVOID Boost,
    _In_ ULONG BoostCount
    );

#endif
#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwAlertMultipleThreadByThreadId(
    _In_ PHANDLE MultipleThreadId,
    _In_ ULONG Count,
    _In_ PVOID Boost,
    _In_ ULONG BoostCount
    );

#endif
View code on GitHub