NtSetEventBoostPriority - NtDoc

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

NTSYSCALLAPI
NTSTATUS
NTAPI
NtSetEventBoostPriority(
    _In_ HANDLE EventHandle
    );

#endif
#endif

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#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwSetEventBoostPriority(
    _In_ HANDLE EventHandle
    );

#endif

View code on GitHub

Function NtSetEventPriorityBoost was added in Windows XP system. Has the same functionality as NtSetEvent, but thread that is waiting on specified Event will be executed immediately after context switch, regardless of waiting thread's priority.

EventHandle

HANDLE to previously created or opened Event object. Note that Event has to be created with EVENT_TYPE set to SynchronizationEvent (automatic reset), in other cases function will return with error.

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