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

/**
 * Waits for one or all of an array of waitable objects. Use WaitAny to identify
 * the satisfied object, or WaitAll to acquire the complete set without partially
 * consuming available signals while other objects are not ready.
 *
 * \param Count Number of handles, from 1 through MAXIMUM_WAIT_OBJECTS (64).
 * \param Handles Array of Count pointer-sized handles, each requiring SYNCHRONIZE
 * (0x00100000). WaitAll rejects duplicate underlying dispatcher objects, including
 * distinct handle values obtained by duplicating a handle to the same object.
 * \param WaitType WaitAll (0) or WaitAny (1). WaitAny selects the lowest array
 * index among objects simultaneously eligible when the wait is evaluated.
 * \param Alertable TRUE permits an alert or ordinary user APC to interrupt the wait.
 * \param Timeout Optional 100-nanosecond deadline: NULL for no deadline, pointed-to
 * zero for polling, negative for a relative interval, positive for absolute NT system time.
 * \return WaitAny returns STATUS_WAIT_0 plus the selected zero-based index, or
 * STATUS_ABANDONED_WAIT_0 (0x80) plus that index when acquiring an abandoned mutant.
 * WaitAll returns STATUS_SUCCESS (0), or STATUS_ABANDONED (0x80) when the set is
 * acquired and includes an abandoned mutant; the latter does not identify an index.
 * STATUS_TIMEOUT (0x102), STATUS_USER_APC (0xC0) and STATUS_ALERTED (0x101) do not
 * establish acquisition. Test the status category, not just NT_SUCCESS.
 * \remarks On the native x64 and WoW64 paths, invalid Count returns
 * STATUS_INVALID_PARAMETER_1, invalid WaitType returns STATUS_INVALID_PARAMETER_3,
 * and WaitAll with duplicate objects returns STATUS_INVALID_PARAMETER_MIX.
 * All handles are referenced and access-checked before entering the dispatcher wait;
 * an inaccessible later handle fails even if an earlier object is already signaled.
 * A WaitAll timeout does not consume signals or acquire an abandoned mutant from
 * an incomplete set. A completion-port handle is rejected for WaitAll with
 * STATUS_INVALID_HANDLE. Cross-VM and special object paths
 * have additional restrictions; this is not a promise that any handle is waitable.
 * \sa https://learn.microsoft.com/en-us/windows/win32/api/synchapi/nf-synchapi-waitformultipleobjectsex
 */
_Kernel_entry_
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

_Kernel_entry_
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