timer.h

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#pragma once
 
/*
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/** Timer lists with event callbacks
 *
 * @file src/lib/util/event.h
 *
 * @copyright 2025 Arran Cudbard-Bell (a.cudbardb@freeradius.org)
 */
RCSIDH(timer_h, "$Id: 958abce364a66425157c3efab4647313ea3998b6 $")
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <freeradius-devel/util/time.h>
#include <freeradius-devel/util/talloc.h>
 
/*
 *      Allow public and private versions of the same structures
 */
#ifdef _CONST
#  error _CONST can only be defined in the local header
#endif
#ifndef _TIMER_PRIVATE
typedef struct fr_timer_list_pub_s fr_timer_list_t;
#  define _CONST const
#else
#  define _CONST
#endif
 
/** Alternative time source, useful for testing
 *
 * @return the current time in nanoseconds past the epoch.
 */
typedef fr_time_t (*fr_event_time_source_t)(void);
 
/** Public event timer list structure
 *
 * Make the current list time, and time source available, but nothing else.
 *
 * This allows us to access these values without the cost of a function call.
 */
struct fr_timer_list_pub_s {
        fr_event_time_source_t _CONST time;     //!< Time source this list uses to get the current time
                                                ///< when calculating deltas (fr_timer_in).
};
 
/** An opaque timer handle
 */
typedef struct fr_timer_s fr_timer_t;
 
/** Called when a timer event fires
 *
 * @param[in] tl        timer list event was inserted into.
 * @param[in] now       The current time.
 * @param[in] uctx      User ctx passed to #fr_timer_in or #fr_timer_at.
 */
typedef void (*fr_timer_cb_t)(fr_timer_list_t *tl, fr_time_t now, void *uctx);
 
int                     _fr_timer_at(NDEBUG_LOCATION_ARGS
                                     TALLOC_CTX *ctx, fr_timer_list_t *tl, fr_timer_t **ev,
                                     fr_time_t when, bool free_on_fire, fr_timer_cb_t callback, void const *uctx)
                                     CC_HINT(nonnull(NDEBUG_LOCATION_NONNULL(2), NDEBUG_LOCATION_NONNULL(3), NDEBUG_LOCATION_NONNULL(6)));
#define                 fr_timer_at(...) _fr_timer_at(NDEBUG_LOCATION_EXP __VA_ARGS__)
 
int                     _fr_timer_in(NDEBUG_LOCATION_ARGS
                                     TALLOC_CTX *ctx, fr_timer_list_t *tl, fr_timer_t **ev,
                                     fr_time_delta_t delta, bool free_on_fire, fr_timer_cb_t callback, void const *uctx)
                                     CC_HINT(nonnull(NDEBUG_LOCATION_NONNULL(2), NDEBUG_LOCATION_NONNULL(3), NDEBUG_LOCATION_NONNULL(6)));
#define                 fr_timer_in(...) _fr_timer_in(NDEBUG_LOCATION_EXP __VA_ARGS__)
 
int                     fr_timer_disarm(fr_timer_t *ev);                        /* disarms but does not free */
 
#define                 FR_TIMER_DISARM(_ev) \
                        do { \
                                if (likely((_ev) != NULL) && unlikely(fr_timer_disarm(_ev) < 0)) { \
                                        fr_assert_msg(0, "Failed to disarm timer %p", (_ev)); \
                                } \
                        } while (0)
 
#define                 FR_TIMER_DISARM_RETURN(_ev) \
                                if ((likely(((_ev)) != NULL) && unlikely(!fr_cond_assert_msg(fr_timer_disarm(_ev) == 0, "Failed to disarm timer %p", (_ev))))) return -1;
 
int                     fr_timer_delete(fr_timer_t **ev_p) CC_HINT(nonnull);    /* disarms AND frees */
 
#define                 FR_TIMER_DELETE(_ev_p) \
                        do { \
                                if ((likely((*(_ev_p)) != NULL) && unlikely(fr_timer_delete(_ev_p) < 0))) { \
                                        fr_assert_msg(0, "Failed to delete timer %p", *(_ev_p)); \
                                } \
                        } while (0)
 
#define                 FR_TIMER_DELETE_RETURN(_ev_p) \
                                if ((likely((*(_ev_p)) != NULL) && unlikely(!fr_cond_assert_msg(fr_timer_delete(_ev_p) == 0, "Failed to delete timer %p", *(_ev_p))))) return -1;
 
fr_time_t               fr_timer_when(fr_timer_t *ev) CC_HINT(nonnull);
 
bool                    _fr_timer_armed(fr_timer_t *ev);
 
/* Wrapper to avoid overhead of function call on NULL */
#define                 fr_timer_armed(_ev) ((_ev) && _fr_timer_armed(_ev))     /* returns true if the timer is armed */
 
int                     fr_timer_list_force_run(fr_timer_list_t *tl) CC_HINT(nonnull);
 
int                     fr_timer_list_run(fr_timer_list_t *tl, fr_time_t *when);
 
int                     fr_timer_list_disarm(fr_timer_list_t *tl) CC_HINT(nonnull);
 
uint64_t                fr_timer_list_num_events(fr_timer_list_t *tl) CC_HINT(nonnull);
 
fr_time_t               fr_timer_list_when(fr_timer_list_t *tl) CC_HINT(nonnull);
 
void                    fr_timer_list_set_time_func(fr_timer_list_t *tl, fr_event_time_source_t func) CC_HINT(nonnull);
 
fr_timer_list_t         *fr_timer_list_lst_alloc(TALLOC_CTX *ctx, fr_timer_list_t *parent);
 
fr_timer_list_t         *fr_timer_list_ordered_alloc(TALLOC_CTX *ctx, fr_timer_list_t *parent);
 
#ifdef WITH_EVENT_DEBUG
void                    fr_timer_report(fr_timer_list_t *tl, fr_time_t now, void *uctx);
void                    fr_timer_dump(fr_timer_list_t *tl);
#endif
 
#undef _CONST
 
#ifdef __cplusplus
}
#endif