在Linux内核驱动中,构建一个环形队列,struct ring_buffer { int head; int tail; struct msg *data; int size; unsigned int capacity; };其中存放的是定义如下的结构体struct msg { u16 module_id; u16 cmd_id; u16 cmd_subid; u16 complete; u8 data[128]; };,请你给出操作这个环形队列的功能函数,分别为:初始化、入队、出队、注销、判断空、判断满,再写两个函数,函数一向队列中放置msg,函数二将msg从队列中取出来,解析msg中的module_id,如果该值不为0x1,则报错,否则使用switch函数解析cmd_id,并根据不同的cmd_id再解析cmd_subid,并将msg中的complete成员设置为1,函数一使用usleep_range()函数等待complete设置为1后,退出函数,函数一和函数二需要使用队列的操作函数
时间: 2024-03-13 18:46:23 浏览: 53
好的,根据你的要求,我会给出对应的操作函数。请注意,以下代码仅是示例,可能需要根据具体需求进行修改和完善。
初始化函数:
```
void ring_buffer_init(struct ring_buffer *rb, unsigned int capacity)
{
rb->head = 0;
rb->tail = 0;
rb->size = 0;
rb->capacity = capacity;
rb->data = kmalloc(capacity * sizeof(struct msg), GFP_KERNEL);
}
```
入队函数:
```
int ring_buffer_push(struct ring_buffer *rb, struct msg *msg)
{
if (ring_buffer_full(rb))
return -1;
memcpy(&rb->data[rb->tail], msg, sizeof(struct msg));
rb->tail = (rb->tail + 1) % rb->capacity;
rb->size++;
return 0;
}
```
出队函数:
```
int ring_buffer_pop(struct ring_buffer *rb, struct msg *msg)
{
if (ring_buffer_empty(rb))
return -1;
memcpy(msg, &rb->data[rb->head], sizeof(struct msg));
rb->head = (rb->head + 1) % rb->capacity;
rb->size--;
return 0;
}
```
注销函数:
```
void ring_buffer_destroy(struct ring_buffer *rb)
{
kfree(rb->data);
rb->data = NULL;
rb->size = 0;
rb->capacity = 0;
}
```
判断空函数:
```
int ring_buffer_empty(struct ring_buffer *rb)
{
return (rb->size == 0);
}
```
判断满函数:
```
int ring_buffer_full(struct ring_buffer *rb)
{
return (rb->size == rb->capacity);
}
```
函数一:
```
void put_msg(struct ring_buffer *rb, struct msg *msg)
{
int ret;
ret = ring_buffer_push(rb, msg);
if (ret == 0) {
while (msg->complete == 0) {
usleep_range(1000, 2000); // 等待complete被设置为1
}
}
}
```
函数二:
```
void get_msg(struct ring_buffer *rb, struct msg *msg)
{
int ret;
ret = ring_buffer_pop(rb, msg);
if (ret == 0) {
if (msg->module_id != 0x1) {
printk(KERN_ERR "Error: module_id is not 0x1.\n");
} else {
switch (msg->cmd_id) {
case 0x01:
// 解析cmd_subid
msg->complete = 1;
break;
case 0x02:
// 解析cmd_subid
msg->complete = 1;
break;
// ...
default:
printk(KERN_ERR "Error: unknown cmd_id.\n");
break;
}
}
}
}
```
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