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/*
* Copyright (c) 2017 Richard Braun.
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef _KERN_TIMER_I_H
#define _KERN_TIMER_I_H
#include <stdbool.h>
#include <stdint.h>
#include <kern/hlist.h>
#include <kern/work.h>
/*
* Locking keys :
* (c) cpu_data
* (a) atomic
*
* (*) The ticks member represents the expiration date. It may be read without
* locking the timer, in which case it must be accessed atomically. It
* may only be updated when the timer is locked though, so reads at such
* times don't need to be atomic.
*
* (**) The cpu member is used to determine which lock serializes access to
* the structure. It must be accessed atomically, but updated while the
* timer is locked.
*/
struct timer {
union {
struct hlist_node node; /* (c) */
struct work work;
};
uint64_t ticks; /* (c,a,*) */
timer_fn_t fn;
unsigned int cpu; /* (c,a,**) */
unsigned short state; /* (c) */
unsigned short flags; /* (c) */
struct thread *joiner; /* (c) */
};
#endif /* _KERN_TIMER_I_H */
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