NtAlertMultipleThreadByThreadId - NtDoc

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

/**
 * Sends an alert to multiple threads by their thread IDs.
 *
 * @param MultipleThreadId A pointer to an array of thread IDs to be alerted.
 * @param Count The number of thread IDs in the array.
 * @param Boost A pointer to a boost value to be applied to the threads.
 * @param BoostCount The number of boost values in the array.
 * @return NTSTATUS Successful or errant status.
 */
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