NtReleaseMutant - 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
NtReleaseMutant(
    _In_ HANDLE MutantHandle,
    _Out_opt_ PLONG PreviousCount
    );

#endif
#endif

View code on GitHub
#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwReleaseMutant(
    _In_ HANDLE MutantHandle,
    _Out_opt_ PLONG PreviousCount
    );

#endif

View code on GitHub

PreviousCount

Internal mutant counter state before call NtReleaseMutant.

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