linux 内核线程demo

#include<linux/module.h>
#include<linux/sched.h>
#include<linux/pid.h>

#define SWITCH_DELAY_S    (2000)

struct switch_struct {
int en;
struct mutex en_lock;
struct mutex sw_lock;
struct task_struct *task;
}switch_info;

static int scene_switch_task_func(void *data)
{
int ret = 0;

while (!kthread_should_stop()) {
mutex_lock(&(switch_info.sw_lock));
//do somethings.
mutex_unlock(&(switch_info.sw_lock));
msleep(SWITCH_DELAY_S);
}

return 0;
}

static inline void scene_switch_wakeup()  {

}

static inline void scene_switch_sleep()  {

}

static inline void scene_switch_enable()  {
mutex_lock(&(switch_info.en_lock));
if(!switch_info.en)  {
get_task_struct(switch_info.task);
wake_up_process(switch_info.task);
switch_info.en = 1;
}
mutex_unlock(&(switch_info.en_lock));
}

static inline void scene_switch_disenable()  {
mutex_lock(&(switch_info.en_lock));
if(switch_info.en)	{
kthread_stop(switch_info.task);
put_task_struct(switch_info.task);
switch_info.en = 0;
}
mutex_unlock(&(switch_info.en_lock));
}

static void vfe_scene_kthread(struct vfe_dev *dev)  {
switch_info.en = 0;
mutex_init(&(switch_info.en_lock));
mutex_init(&(switch_info.sw_lock));
switch_info.task = kthread_create(scene_switch_task_func,dev, "scene_switch_task");
if (IS_ERR(switch_info.task))  {
printk("Kthread create error.");
}
}