NtTestAlert - 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)

/**
 * The NtTestAlert routine indicates whether the current thread has an alert pending
 * and executes asynchronous procedure calls (APCs) queued to the current thread.
 *
 * \return NTSTATUS Successful or errant status.
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtTestAlert(
    VOID
    );

#endif
#endif

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#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwTestAlert(
    VOID
    );

#endif

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NTinternals.net (undocumented.ntinternals.net)

You can use NtTestAlert to empty APC queue for current thread. If APC queue was empty before call, NtTestAlert has no effect.

NtTestAlert is typical ntcall kernel routine, accessible via int 2Eh. It check thread APC queue, and call KiUserApcDispatcher.

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See also

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