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/* Asynchronous timers.
Copyright (C) 2000-2020 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs 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 3 of the License, or (at
your option) any later version.
GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
#ifndef EMACS_ATIMER_H
#define EMACS_ATIMER_H
#include <time.h>
/* Forward declaration. */
struct atimer;
/* Types of timers. */
enum atimer_type
{
/* Timer is ripe at some absolute time. */
ATIMER_ABSOLUTE,
/* Timer is ripe at now plus an offset. */
ATIMER_RELATIVE,
/* Timer runs continuously. */
ATIMER_CONTINUOUS
};
/* Type of timer callback functions. */
typedef void (* atimer_callback) (struct atimer *timer);
/* Structure describing an asynchronous timer. */
struct atimer
{
/* The type of this timer. */
enum atimer_type type;
/* Time when this timer is ripe. */
struct timespec expiration;
/* Interval of this timer. */
struct timespec interval;
/* Function to call when timer is ripe. Interrupt input is
guaranteed to not be blocked when this function is called. */
atimer_callback fn;
/* Additional user-specified data to pass to FN. */
void *client_data;
/* Next in list of active or free atimers. */
struct atimer *next;
};
/* Function prototypes. */
struct atimer *start_atimer (enum atimer_type, struct timespec,
atimer_callback, void *);
void cancel_atimer (struct atimer *);
void do_pending_atimers (void);
void init_atimer (void);
void turn_on_atimers (bool);
void stop_other_atimers (struct atimer *);
void run_all_atimers (void);
#ifdef HAVE_TIMERFD
void timerfd_callback (int, void *);
#endif
#endif /* EMACS_ATIMER_H */
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