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Merge pull request #173 from grissiom/new-timer 

kernel: use skip list to implement timer list
This commit is contained in:
Bernard Xiong 2013-10-17 15:44:20 -07:00
parent c29ff6b0ac d59aa279c3
commit 3eac58ce8e
3 changed files with 141 additions and 55 deletions
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11
include/rtdef.h
View File

@ -410,6 +410,15 @@ struct rt_object_information
#define RT_TIMER_CTRL_SET_ONESHOT 0x2 /**< change timer to one shot */
#define RT_TIMER_CTRL_SET_PERIODIC 0x3 /**< change timer to periodic */
#ifndef RT_TIMER_SKIP_LIST_LEVEL
#define RT_TIMER_SKIP_LIST_LEVEL 1
#endif
/* 1 or 3 */
#ifndef RT_TIMER_SKIP_LIST_MASK
#define RT_TIMER_SKIP_LIST_MASK 0x3
#endif
/**
* timer structure
*/
@ -417,7 +426,7 @@ struct rt_timer
{
struct rt_object parent; /**< inherit from rt_object */
rt_list_t list; /**< the node of timer list */
rt_list_t row[RT_TIMER_SKIP_LIST_LEVEL];
void (*timeout_func)(void *parameter); /**< timeout function */
void *parameter; /**< timeout function's parameter */

9
src/thread.c
View File

@ -61,8 +61,7 @@ static void rt_thread_exit(void)
thread->stat = RT_THREAD_CLOSE;
/* remove it from timer list */
rt_list_remove(&(thread->thread_timer.list));
rt_object_detach((rt_object_t)&(thread->thread_timer));
rt_timer_detach(&thread->thread_timer);
if ((rt_object_is_systemobject((rt_object_t)thread) == RT_TRUE) &&
thread->cleanup == RT_NULL)
@ -613,11 +612,7 @@ rt_err_t rt_thread_resume(rt_thread_t thread)
/* remove from suspend list */
rt_list_remove(&(thread->tlist));
/* remove thread timer */
rt_list_remove(&(thread->thread_timer.list));
/* change timer state */
thread->thread_timer.parent.flag &= ~RT_TIMER_FLAG_ACTIVATED;
rt_timer_stop(&thread->thread_timer);
/* enable interrupt */
rt_hw_interrupt_enable(temp);

176
src/timer.c
View File

@ -34,7 +34,7 @@
#include <rthw.h>
/* hard timer list */
static rt_list_t rt_timer_list = RT_LIST_OBJECT_INIT(rt_timer_list);
static rt_list_t rt_timer_list[RT_TIMER_SKIP_LIST_LEVEL];
#ifdef RT_USING_TIMER_SOFT
#ifndef RT_TIMER_THREAD_STACK_SIZE
@ -46,7 +46,7 @@ static rt_list_t rt_timer_list = RT_LIST_OBJECT_INIT(rt_timer_list);
#endif
/* soft timer list */
static rt_list_t rt_soft_timer_list;
static rt_list_t rt_soft_timer_list[RT_TIMER_SKIP_LIST_LEVEL];
static struct rt_thread timer_thread;
ALIGN(RT_ALIGN_SIZE)
static rt_uint8_t timer_thread_stack[RT_TIMER_THREAD_STACK_SIZE];
@ -83,6 +83,8 @@ static void _rt_timer_init(rt_timer_t timer,
rt_tick_t time,
rt_uint8_t flag)
{
int i;
/* set flag */
timer->parent.flag = flag;
@ -96,21 +98,64 @@ static void _rt_timer_init(rt_timer_t timer,
timer->init_tick = time;
/* initialize timer list */
rt_list_init(&(timer->list));
for (i = 0; i < RT_TIMER_SKIP_LIST_LEVEL; i++)
{
rt_list_init(&(timer->row[i]));
}
}
static rt_tick_t rt_timer_list_next_timeout(rt_list_t *timer_list)
/* the fist timer always in the last row */
static rt_tick_t rt_timer_list_next_timeout(rt_list_t timer_list[])
{
struct rt_timer *timer;
if (rt_list_isempty(timer_list))
if (rt_list_isempty(&timer_list[RT_TIMER_SKIP_LIST_LEVEL - 1]))
return RT_TICK_MAX;
timer = rt_list_entry(timer_list->next, struct rt_timer, list);
timer = rt_list_entry(timer_list[RT_TIMER_SKIP_LIST_LEVEL - 1].next,
struct rt_timer, row[RT_TIMER_SKIP_LIST_LEVEL - 1]);
return timer->timeout_tick;
}
rt_inline void _rt_timer_remove(rt_timer_t timer)
{
int i;
for (i = 0; i < RT_TIMER_SKIP_LIST_LEVEL; i++)
{
rt_list_remove(&timer->row[i]);
}
}
static int rt_timer_count_height(struct rt_timer *timer)
{
int i, cnt = 0;
for (i = 0; i < RT_TIMER_SKIP_LIST_LEVEL; i++)
{
if (!rt_list_isempty(&timer->row[i]))
cnt++;
}
return cnt;
}
void rt_timer_dump(rt_list_t timer_heads[])
{
rt_list_t *list;
for (list = timer_heads[RT_TIMER_SKIP_LIST_LEVEL-1].next;
list != &timer_heads[RT_TIMER_SKIP_LIST_LEVEL-1];
list = list->next)
{
struct rt_timer *timer = rt_list_entry(list,
struct rt_timer,
row[RT_TIMER_SKIP_LIST_LEVEL-1]);
rt_kprintf("%d", rt_timer_count_height(timer));
}
rt_kprintf("\n");
}
/**
* @addtogroup Clock
*/
@ -162,8 +207,7 @@ rt_err_t rt_timer_detach(rt_timer_t timer)
/* disable interrupt */
level = rt_hw_interrupt_disable();
/* remove it from timer list */
rt_list_remove(&(timer->list));
_rt_timer_remove(timer);
/* enable interrupt */
rt_hw_interrupt_enable(level);
@ -224,8 +268,7 @@ rt_err_t rt_timer_delete(rt_timer_t timer)
/* disable interrupt */
level = rt_hw_interrupt_disable();
/* remove it from timer list */
rt_list_remove(&(timer->list));
_rt_timer_remove(timer);
/* enable interrupt */
rt_hw_interrupt_enable(level);
@ -246,9 +289,12 @@ RTM_EXPORT(rt_timer_delete);
*/
rt_err_t rt_timer_start(rt_timer_t timer)
{
struct rt_timer *t;
int row_lvl;
rt_list_t *timer_list;
register rt_base_t level;
rt_list_t *n, *timer_list;
rt_list_t *row_head[RT_TIMER_SKIP_LIST_LEVEL];
unsigned int tst_nr;
static unsigned int random_nr;
/* timer check */
RT_ASSERT(timer != RT_NULL);
@ -271,39 +317,64 @@ rt_err_t rt_timer_start(rt_timer_t timer)
if (timer->parent.flag & RT_TIMER_FLAG_SOFT_TIMER)
{
/* insert timer to soft timer list */
timer_list = &rt_soft_timer_list;
timer_list = rt_soft_timer_list;
}
else
#endif
{
/* insert timer to system timer list */
timer_list = &rt_timer_list;
timer_list = rt_timer_list;
}
for (n = timer_list->next; n != timer_list; n = n->next)
row_head[0] = &timer_list[0];
for (row_lvl = 0; row_lvl < RT_TIMER_SKIP_LIST_LEVEL; row_lvl++)
{
t = rt_list_entry(n, struct rt_timer, list);
for (;row_head[row_lvl] != timer_list[row_lvl].prev;
row_head[row_lvl] = row_head[row_lvl]->next)
{
struct rt_timer *t;
rt_list_t *p = row_head[row_lvl]->next;
/*
* It supposes that the new tick shall less than the half duration of
* tick max. And if we have two timers that timeout at the same time,
* it's prefered that the timer inserted early get called early.
*/
if ((t->timeout_tick - timer->timeout_tick) == 0)
{
rt_list_insert_after(n, &(timer->list));
break;
}
else if ((t->timeout_tick - timer->timeout_tick) < RT_TICK_MAX / 2)
{
rt_list_insert_before(n, &(timer->list));
break;
/* fix up the entry pointer */
t = rt_list_entry(p, struct rt_timer, row[row_lvl]);
/* If we have two timers that timeout at the same time, it's
* preferred that the timer inserted early get called early.
* So insert the new timer to the end the the some-timeout timer
* list.
*/
if ((t->timeout_tick - timer->timeout_tick) == 0)
{
continue;
}
else if ((t->timeout_tick - timer->timeout_tick) < RT_TICK_MAX / 2)
{
break;
}
}
if (row_lvl != RT_TIMER_SKIP_LIST_LEVEL - 1)
row_head[row_lvl+1] = row_head[row_lvl]+1;
}
/* no found suitable position in timer list */
if (n == timer_list)
/* Interestingly, this super simple timer insert counter works very very
* well on distributing the list height uniformly. By means of "very very
* well", I mean it beats the randomness of timer->timeout_tick very easily
* (actually, the timeout_tick is not random and easy to be attacked). */
random_nr++;
tst_nr = random_nr;
rt_list_insert_after(row_head[RT_TIMER_SKIP_LIST_LEVEL-1],
&(timer->row[RT_TIMER_SKIP_LIST_LEVEL-1]));
for (row_lvl = 2; row_lvl <= RT_TIMER_SKIP_LIST_LEVEL; row_lvl++)
{
rt_list_insert_before(n, &(timer->list));
if (!(tst_nr & RT_TIMER_SKIP_LIST_MASK))
rt_list_insert_after(row_head[RT_TIMER_SKIP_LIST_LEVEL - row_lvl],
&(timer->row[RT_TIMER_SKIP_LIST_LEVEL - row_lvl]));
else
break;
/* Shift over the bits we have tested. Works well with 1 bit and 2
* bits. */
tst_nr >>= (RT_TIMER_SKIP_LIST_MASK+1)>>1;
}
timer->parent.flag |= RT_TIMER_FLAG_ACTIVATED;
@ -349,8 +420,7 @@ rt_err_t rt_timer_stop(rt_timer_t timer)
/* disable interrupt */
level = rt_hw_interrupt_disable();
/* remove it from timer list */
rt_list_remove(&(timer->list));
_rt_timer_remove(timer);
/* enable interrupt */
rt_hw_interrupt_enable(level);
@ -418,9 +488,10 @@ void rt_timer_check(void)
/* disable interrupt */
level = rt_hw_interrupt_disable();
while (!rt_list_isempty(&rt_timer_list))
while (!rt_list_isempty(&rt_timer_list[RT_TIMER_SKIP_LIST_LEVEL-1]))
{
t = rt_list_entry(rt_timer_list.next, struct rt_timer, list);
t = rt_list_entry(rt_timer_list[RT_TIMER_SKIP_LIST_LEVEL - 1].next,
struct rt_timer, row[RT_TIMER_SKIP_LIST_LEVEL - 1]);
/*
* It supposes that the new tick shall less than the half duration of
@ -431,7 +502,7 @@ void rt_timer_check(void)
RT_OBJECT_HOOK_CALL(rt_timer_timeout_hook, (t));
/* remove timer from timer list firstly */
rt_list_remove(&(t->list));
_rt_timer_remove(t);
/* call timeout function */
t->timeout_func(t->parameter);
@ -471,7 +542,7 @@ void rt_timer_check(void)
*/
rt_tick_t rt_timer_next_timeout_tick(void)
{
return rt_timer_list_next_timeout(&rt_timer_list);
return rt_timer_list_next_timeout(rt_timer_list);
}
#ifdef RT_USING_TIMER_SOFT
@ -489,9 +560,10 @@ void rt_soft_timer_check(void)
current_tick = rt_tick_get();
for (n = rt_soft_timer_list.next; n != &(rt_soft_timer_list);)
for (n = rt_soft_timer_list[RT_TIMER_SKIP_LIST_LEVEL-1].next;
n != &(rt_soft_timer_list[RT_TIMER_SKIP_LIST_LEVEL-1]);)
{
t = rt_list_entry(n, struct rt_timer, list);
t = rt_list_entry(n, struct rt_timer, row[RT_TIMER_SKIP_LIST_LEVEL-1]);
/*
* It supposes that the new tick shall less than the half duration of
@ -505,7 +577,7 @@ void rt_soft_timer_check(void)
n = n->next;
/* remove timer from timer list firstly */
rt_list_remove(&(t->list));
_rt_timer_remove(timer);
/* call timeout function */
t->timeout_func(t->parameter);
@ -542,7 +614,7 @@ static void rt_thread_timer_entry(void *parameter)
while (1)
{
/* get the next timeout tick */
next_timeout = rt_timer_list_next_timeout(&rt_soft_timer_list);
next_timeout = rt_timer_list_next_timeout(rt_soft_timer_list);
if (next_timeout == RT_TICK_MAX)
{
/* no software timer exist, suspend self. */
@ -578,12 +650,15 @@ static void rt_thread_timer_entry(void *parameter)
* @ingroup SystemInit
*
* This function will initialize system timer
*
* @deprecated since 1.1.0, this function does not need to be invoked
* in the system initialization.
*/
void rt_system_timer_init(void)
{
int i;
for (i = 0; i < sizeof(rt_timer_list)/sizeof(rt_timer_list[0]); i++)
{
rt_list_init(rt_timer_list+i);
}
}
/**
@ -594,7 +669,14 @@ void rt_system_timer_init(void)
void rt_system_timer_thread_init(void)
{
#ifdef RT_USING_TIMER_SOFT
rt_list_init(&rt_soft_timer_list);
int i;
for (i = 0;
i < sizeof(rt_soft_timer_list)/sizeof(rt_soft_timer_list[0]);
i++)
{
rt_list_init(rt_soft_timer_list+i);
}
/* start software timer thread */
rt_thread_init(&timer_thread,