NtReleaseSemaphore - 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
NtReleaseSemaphore(
    _In_ HANDLE SemaphoreHandle,
    _In_ LONG ReleaseCount,
    _Out_opt_ PLONG PreviousCount
    );

#endif
#endif

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#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwReleaseSemaphore(
    _In_ HANDLE SemaphoreHandle,
    _In_ LONG ReleaseCount,
    _Out_opt_ PLONG PreviousCount
    );

#endif

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Function NtReleaseSemaphore increments semaphore's counter, opposite to any waiting function (semaphore is signaled when semaphore's counter is greater then zero).

SemaphoreHandle

HANDLE to Semaphore Object opened with SEMAPHORE_MODIFY_STATE access.

ReleaseCount

Number of increments, typically set to 1.

PreviousCount

Optional pointer to ULONG value receiving semaphore's counter state before call.

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See also

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