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freeswitch/libs/freetdm/src/include/private/ftdm_sched.h
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2014-07-13 00:35:48 -04:00

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/*
* Copyright (c) 2010, Sangoma Technologies
* Moises Silva <moy@sangoma.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of the original author; nor the names of any contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __FTDM_SCHED_H__
#define __FTDM_SCHED_H__
#include "freetdm.h"
#ifdef __cplusplus
extern "C" {
#endif
#define FTDM_MICROSECONDS_PER_SECOND 1000000
typedef struct ftdm_sched ftdm_sched_t;
typedef void (*ftdm_sched_callback_t)(void *data);
typedef uint64_t ftdm_timer_id_t;
/*! \brief Create a new scheduling context */
FT_DECLARE(ftdm_status_t) ftdm_sched_create(ftdm_sched_t **sched, const char *name);
/*! \brief Run the schedule to find timers that are expired and run its callbacks */
FT_DECLARE(ftdm_status_t) ftdm_sched_run(ftdm_sched_t *sched);
/*! \brief Run the schedule in its own thread. Callbacks will be called in a core thread. You *must* not block there! */
FT_DECLARE(ftdm_status_t) ftdm_sched_free_run(ftdm_sched_t *sched);
/*!
* \brief Schedule a new timer
* \param sched The scheduling context (required)
* \param name Timer name, typically unique but is not required to be unique, any null terminated string is fine (required)
* \param callback The callback to call upon timer expiration (required)
* \param data Optional data to pass to the callback
* \param timer Timer id pointer to store the id of the newly created timer. It can be null
* if you do not need to know the id, but you need this if you want to be able
* to cancel the timer with ftdm_sched_cancel_timer
*/
FT_DECLARE(ftdm_status_t) ftdm_sched_timer(ftdm_sched_t *sched, const char *name,
int ms, ftdm_sched_callback_t callback, void *data, ftdm_timer_id_t *timer);
/*!
* \brief Cancel the timer
* Note that there is a race between cancelling and triggering a timer.
* By the time you call this function the timer may be about to be triggered.
* This is specially true with timers in free run schedule.
* \param sched The scheduling context (required)
* \param timer The timer to cancel (required)
*/
FT_DECLARE(ftdm_status_t) ftdm_sched_cancel_timer(ftdm_sched_t *sched, ftdm_timer_id_t timer);
/*! \brief Destroy the context and all of the scheduled timers in it */
FT_DECLARE(ftdm_status_t) ftdm_sched_destroy(ftdm_sched_t **sched);
/*!
* \brief Calculate the time to the next timer and return it
* \param sched The sched context
* \param timeto The pointer to store the next timer time in milliseconds
*/
FT_DECLARE(ftdm_status_t) ftdm_sched_get_time_to_next_timer(const ftdm_sched_t *sched, int32_t *timeto);
/*! \brief Global initialization, called just once, this is called by FreeTDM core, other users MUST not call it */
FT_DECLARE(ftdm_status_t) ftdm_sched_global_init(void);
/*! \brief Global destroy, called just once, this is called by FreeTDM core, other users MUST not call it */
FT_DECLARE(ftdm_status_t) ftdm_sched_global_destroy(void);
/*! \brief Checks if the main scheduling thread is running */
FT_DECLARE(ftdm_bool_t) ftdm_free_sched_running(void);
/*! \brief Stop the main scheduling thread (if running) */
FT_DECLARE(ftdm_bool_t) ftdm_free_sched_stop(void);
#ifdef __cplusplus
}
#endif
#endif
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