#ifndef _NTTP_H

// winbase:CloseThreadpoolCleanupGroupMembers
/**
 * Releases the members of the specified cleanup group.
 *
 * \param[in,out] CleanupGroup A pointer to a TP_CLEANUP_GROUP structure that defines the cleanup group.
 * \param[in] CancelPendingCallbacks If TRUE, pending callbacks that have not started are canceled.
 * \param[in,out] CleanupParameter Optional application-defined context to pass to cleanup callbacks.
 * \sa https://learn.microsoft.com/en-us/windows/win32/api/threadpoolapiset/nf-threadpoolapiset-closethreadpoolcleanupgroupmembers
 */
NTSYSAPI
VOID
NTAPI
TpReleaseCleanupGroupMembers(
    _Inout_ PTP_CLEANUP_GROUP CleanupGroup,
    _In_ LOGICAL CancelPendingCallbacks,
    _Inout_opt_ PVOID CleanupParameter
    );

#endif
View code on GitHub