#ifndef _NTOBAPI_H
//
// Objects, handles
//
#if (PHNT_MODE != PHNT_MODE_KERNEL)

/**
 * The NtWaitForMultipleObjects routine waits until one or all of the specified objects are in the signaled state, an I/O completion routine or asynchronous procedure call (APC) is queued to the thread, or the time-out interval elapses.
 *
 * @param Count The number of object handles to wait for in the array pointed to by lpHandles. The maximum number of object handles is MAXIMUM_WAIT_OBJECTS. This parameter cannot be zero.
 * @param Handles An array of object handles. The array can contain handles of objects of different types. It may not contain multiple copies of the same handle.
 * @param WaitType If this parameter is WaitAll, the function returns when the state of all objects in the Handles array is set to signaled.
 * @param Alertable f this parameter is TRUE and the thread is in the waiting state, the function returns when the system queues an I/O completion routine or APC, and the thread runs the routine or function.
 * @param Timeout A pointer to an absolute or relative time over which the wait is to occur. Can be null. If a timeout is specified,
 * and the object has not attained a state of signaled when the timeout expires, then the wait is automatically satisfied.
 * If an explicit timeout value of zero is specified, then no wait occurs if the wait cannot be satisfied immediately.
 * @return NTSTATUS Successful or errant status.
 * @sa https://learn.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-waitformultipleobjectsex
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtWaitForMultipleObjects(
    _In_ ULONG Count,
    _In_reads_(Count) HANDLE Handles[],
    _In_ WAIT_TYPE WaitType,
    _In_ BOOLEAN Alertable,
    _In_opt_ PLARGE_INTEGER Timeout
    );

#endif
#endif
View code on GitHub

#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwWaitForMultipleObjects(
    _In_ ULONG Count,
    _In_reads_(Count) HANDLE Handles[],
    _In_ WAIT_TYPE WaitType,
    _In_ BOOLEAN Alertable,
    _In_opt_ PLARGE_INTEGER Timeout
    );

#endif
View code on GitHub