中断的下半部分之三work_queue

zhanglong71

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]#