60 lines
2.0 KiB
C
60 lines
2.0 KiB
C
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/*
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* Copyright (c) 2008 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef __KERNEL_TIMER_H
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#define __KERNEL_TIMER_H
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#include <list.h>
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#include <sys/types.h>
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void timer_init(void);
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struct timer;
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typedef enum handler_return (*timer_callback)(struct timer *, time_t now, void *arg);
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#define TIMER_MAGIC 'timr'
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typedef struct timer {
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int magic;
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struct list_node node;
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time_t scheduled_time;
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time_t periodic_time;
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timer_callback callback;
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void *arg;
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} timer_t;
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/* Rules for Timers:
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* - Timer callbacks occur from interrupt context
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* - Timers may be programmed or canceled from interrupt or thread context
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* - Timers may be canceled or reprogrammed from within their callback
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* - Timers currently are dispatched from a 10ms periodic tick
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*/
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void timer_initialize(timer_t *);
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void timer_set_oneshot(timer_t *, time_t delay, timer_callback, void *arg);
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void timer_set_periodic(timer_t *, time_t period, timer_callback, void *arg);
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void timer_cancel(timer_t *);
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#endif
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