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取消定时器

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This commit is contained in:
Yourtion
2016-05-11 15:32:26 +08:00
parent 9475d3d828
commit efb6028e00
3 changed files with 57 additions and 1 deletions
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51
24_day/timer.c
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@@ -36,6 +36,7 @@ struct TIMER *timer_alloc(void)
for (i = 0; i < MAX_TIMER; i++) {
if (timerctl.timers0[i].flags == 0) {
timerctl.timers0[i].flags = TIMER_FLAGS_ALLOC;
timerctl.timers0[i].flags2 = 0;
return &timerctl.timers0[i];
}
}
@@ -116,3 +117,53 @@ void inthandler20(int *esp)
}
return;
}
int timer_cancel(struct TIMER *timer)
{
int e;
struct TIMER *t;
e = io_load_eflags();
io_cli(); /*在设置过程中禁止改变定时器状态*/
if (timer->flags == TIMER_FLAGS_USING) { /*是否需要取消？*/
if (timer == timerctl.t0) {
/*第一个定时器的取消处理*/
t = timer->next;
timerctl.t0 = t;
timerctl.next = t->timeout;
} else {
/*非第一个定时器的取消处理*/
/*找到timer前一个定时器*/
t = timerctl.t0;
for (;;) {
if (t->next == timer) {
break;
}
t = t->next;
}
t->next = timer->next;
/*将之前“timer的下一个”指向“timer的下一个”*/
}
timer->flags = TIMER_FLAGS_ALLOC;
io_store_eflags(e);
return 1; /*取消处理成功*/
}
io_store_eflags(e);
return 0; /*不需要取消处理*/
}
void timer_cancelall(struct FIFO32 *fifo)
{
int e, i;
struct TIMER *t;
e = io_load_eflags();
io_cli(); /*在设置过程中禁止改变定时器状态*/
for (i = 0; i < MAX_TIMER; i++) {
t = &timerctl.timers0[i];
if (t->flags != 0 && t->flags2 != 0 && t->fifo == fifo) {
timer_cancel(t);
timer_free(t);
}
}
io_store_eflags(e);
return;
}