在linux中使用工作队列work_queue
软硬件环境:linux-2.6.36/s3c2440
工作队列在进程上下文中运行，允许重新调度甚至睡眠
test.c
|
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <asm/current.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("zhanglong");
struct work_struct my_work;
void work_handle(struct work_struct* arg)
{
long data = atomic_long_read(&arg->data);
printk("current: %s, pid: %d\n", current->comm, current->pid);
ssleep(3);
printk("after sleep, data = %ld\n", data);
//printk("&my_work = 0x%x\n", (unsigned int)&my_work);
}
irqreturn_t irq_handle(int irq, void *dev_id)
{
schedule_work(&my_work);
printk("----irq handle. dev_id = %d\n", (int)dev_id);
return 0;
}
int test_init(void)
{
int ret = 0;
INIT_WORK(&my_work, work_handle);
set_irq_type(IRQ_EINT0, IRQ_TYPE_EDGE_RISING);
ret = request_irq(IRQ_EINT0, irq_handle, 0, "my
irq", (void *)123);
if (ret) {
printk("request irq failed.\n");
return -EBUSY;
}
return 0;
}
void test_exit(void)
{
free_irq(IRQ_EINT0, (void *)123);
}
module_init(test_init);
module_exit(test_exit);
|
Makefile
|
KERNEL = /media/STUDY/linux/kernel/my2440-2.6.36
#KERNEL = /lib/modules/$(shell uname -r)/build
default:
make -C $(KERNEL) M=$(shell
pwd) modules
clean:
make -C $(KERNEL) M=$(shell
pwd) modules clean
modules_install:
make -C $(KERNEL) M=$(shell
pwd) modules_install INSTALL_MOD_PATH=/home/zl/s3c2440_nfs
depmod -a -b /home/zl/s3c2440_nfs 2.6.13-my2440
obj-m += test.o
|
make后插入生成的test.ko模块。按下GPF0所在的按键，终端会有输出：
[root@zhanglong mywork]# ----irq handle. dev_id = 123
current: kworker/0:1, pid: 267
----irq handle. dev_id = 123
----irq handle. dev_id = 123
----irq handle. dev_id = 123
----irq handle. dev_id = 123
----irq handle. dev_id = 123
----irq handle. dev_id = 123
----irq handle. dev_id = 123
----irq handle. dev_id = 123
----irq handle. dev_id = 123
after sleep, data = 0
current: kworker/0:1, pid: 267
after sleep, data = 0
[root@zhanglong mywork]#