On Wed, Feb 27, 2008 at 02:36:14PM -0500, George Nychis wrote:
> Is it possible to cancel a one shot m-block timeout before it occurs, or
> cancel a periodic timeout before a signal is generated?
>
> I know how to cancel periodic timeouts using a received signal's
> meta-data, but I'm not sure its possible to cancel in these situations.
>
> Thanks!
> George
Hi George,
Just use cancel_timeout.
>From class mb_mblock:
/*!
* \brief Schedule a "one shot" timeout.
*
* \param abs_time the absolute time at which the timeout should fire
* \param user_data the data passed in the %timeout message.
*
* When the timeout fires, a message will be sent to the mblock.
*
* The message will have port_id = %sys-port, signal = %timeout,
* data = user_data, metadata = the handle returned from
* schedule_one_shot_timeout, pri = MB_PRI_BEST.
*
* \returns a handle that can be used in cancel_timeout, and is passed
* as the metadata field of the generated %timeout message.
*
* To cancel a pending timeout, call cancel_timeout.
*/
pmt_t
schedule_one_shot_timeout(const mb_time &abs_time, pmt_t user_data);
/*!
* \brief Schedule a periodic timeout.
*
* \param first_abs_time The absolute time at which the first timeout should
fire.
* \param delta_time The relative delay between the first and successive
timeouts.
* \param user_data the data passed in the %timeout message.
*
* When the timeout fires, a message will be sent to the mblock, and a
* new timeout will be scheduled for previous absolute time + delta_time.
*
* The message will have port_id = %sys-port, signal = %timeout,
* data = user_data, metadata = the handle returned from
* schedule_one_shot_timeout, pri = MB_PRI_BEST.
*
* \returns a handle that can be used in cancel_timeout, and is passed
* as the metadata field of the generated %timeout message.
*
* To cancel a pending timeout, call cancel_timeout.
*/
pmt_t
schedule_periodic_timeout(const mb_time &first_abs_time,
const mb_time &delta_time,
pmt_t user_data);
/*!
* \brief Attempt to cancel a pending timeout.
*
* Note that this only stops a future timeout from firing. It is
* possible that a timeout may have already fired and enqueued a
* %timeout message, but that that message has not yet been seen by
* handle_message.
*
* \param handle returned from schedule_one_shot_timeout or
schedule_periodic_timeout.
*/
void cancel_timeout(pmt_t handle);
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