#ifndef _NTTP_H

// winbase:WaitForThreadpoolWaitCallbacks
/**
 * Waits for outstanding wait callbacks to complete and optionally cancels pending callbacks.
 *
 * \param[in,out] Wait A pointer to a TP_WAIT structure that defines the wait object.
 * \param[in] CancelPendingCallbacks If TRUE, pending callbacks that have not started are canceled.
 * \sa https://learn.microsoft.com/en-us/windows/win32/api/threadpoolapiset/nf-threadpoolapiset-waitforthreadpoolwaitcallbacks
 * \remarks Waits for the associated callback-object protocol, optionally canceling pending callbacks. Cancellation does not terminate executing callbacks.
 * First disarm a timer/wait if further dispatch is unwanted, and avoid self-deadlock by waiting on the callback object from inside its own associated callback.
 */
NTSYSAPI
VOID
NTAPI
TpWaitForWait(
    _Inout_ PTP_WAIT Wait,
    _In_ LOGICAL CancelPendingCallbacks
    );

#endif
View code on GitHub