#ifndef _NTTP_H

// winbase:CreateThreadpoolTimer
/**
 * Allocates a timer object.
 *
 * \param[out] Timer A pointer to a variable that receives the new timer object.
 * \param[in] Callback The callback function to execute when the timer expires.
 * \param[in,out] Context Optional application-defined data to pass to the callback function.
 * \param[in] CallbackEnviron Optional callback environment for the callback.
 * \return NTSTATUS Successful or errant status.
 * \sa https://learn.microsoft.com/en-us/windows/win32/api/threadpoolapiset/nf-threadpoolapiset-createthreadpooltimer
 */
NTSYSAPI
NTSTATUS
NTAPI
TpAllocTimer(
    _Out_ PTP_TIMER *Timer,
    _In_ PTP_TIMER_CALLBACK Callback,
    _Inout_opt_ PVOID Context,
    _In_opt_ PTP_CALLBACK_ENVIRON CallbackEnviron
    );

#endif
View code on GitHub