NtPulseEvent - NtDoc

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

/**
 * The NtPulseEvent routine sets an event object to the signaled state and then resets it to the not-signaled state after releasing the appropriate number of waiting threads.
 *
 * \param EventHandle A handle to the event object.
 * \param PreviousState A pointer to a variable that receives the previous state of the event object.
 * \return NTSTATUS Successful or errant status.
 * \see https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-pulseevent
 */
NTSYSCALLAPI
NTSTATUS
NTAPI
NtPulseEvent(
    _In_ HANDLE EventHandle,
    _Out_opt_ PLONG PreviousState
    );

#endif
#endif

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#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwPulseEvent(
    _In_ HANDLE EventHandle,
    _Out_opt_ PLONG PreviousState
    );

#endif

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NTinternals.net (undocumented.ntinternals.net)

EventHandle

HANDLE to Event Object opened with EVENT_MODIFY_STATE access.

PreviousState

State of event before call.

Function sets event to signaled state, releases all (or one - depending on EVENT_TYPE) waiting threads, and resets event to non-signaled state. If they're no waiting threads, NtPulseEvent just clear event state.

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