NtQueueApcThread - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTPSAPI_H
// Threads
#if (PHNT_MODE != PHNT_MODE_KERNEL)

/**
 * Queues an APC (Asynchronous Procedure Call) to a thread.
 *
 * @param ThreadHandle Handle to the thread to which the APC is to be queued.
 * @param ApcRoutine A pointer to the RtlDispatchAPC function or custom APC routine to be executed.
 * @param ApcArgument1 Optional first argument to be passed to the APC routine.
 * @param ApcArgument2 Optional second argument to be passed to the APC routine.
 * @param ApcArgument3 Optional third argument to be passed to the APC routine.
 * @return NTSTATUS Successful or errant status.
 * @remarks The APC will be executed in the context of the specified thread when the thread enters an alertable wait state or when any
 * process calls the NtTestAlert, NtAlertThread, NtAlertResumeThread or NtAlertThreadByThreadId functions.
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtQueueApcThread(
    _In_ HANDLE ThreadHandle,
    _In_ PPS_APC_ROUTINE ApcRoutine, // RtlDispatchAPC
    _In_opt_ PVOID ApcArgument1,
    _In_opt_ PVOID ApcArgument2,
    _In_opt_ PVOID ApcArgument3
    );

#endif
#endif

View code on GitHub
#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwQueueApcThread(
    _In_ HANDLE ThreadHandle,
    _In_ PPS_APC_ROUTINE ApcRoutine,
    _In_opt_ PVOID ApcArgument1,
    _In_opt_ PVOID ApcArgument2,
    _In_opt_ PVOID ApcArgument3
    );

#endif

View code on GitHub

Queues a user-mode Asynchronous Procedure Call (APC) on the specified thread.

Parameters

Remarks

To execute the APC, the thread must first enter an alertable wait via NtDelayExecution (or a similar function) or call NtTestAlert.

To queue a WoW64 APC, encode the ApcRoutine parameter using the Wow64EncodeApcRoutine macro or use RtlQueueApcWow64Thread.

To specify the reserve object or use special user-mode APCs, see NtQueueApcThreadEx and NtQueueApcThreadEx2.

Note that user APCs on the Native API level have three parameters in contrast with the Win32 APCs that only have one.

Related Win32 API

See also