linux頂半部和底半部中斷機制

//tasklet使用模板/*定義tasklet和底半部函數相關聯*/void xxx_do_tasklet(unsigned long);DECLARE_TASKLET(xxx_tasklet,xxx_do_tasklet,0);/*中斷處理底半部*/void xxx_do_tasklet(unsigned long){ ............}/*中斷處理頂半部*/irqreturn_t xxx_interrupt(int irq,void *dev_id,struct pt_regs *regs){...................../*調度xxx_do_tasklet函數在適當的時候執行。*/tasklet_schedule(&xxx_tasklet);......................}/*裝置驅動模組載入函數*/int __init xxx_init(void){................./*申請中斷*/result=request_irq(xxx_irq,xxx_interrupt,SA_INTERRUPT,"XX",NULL);..................}/*裝置驅動模組卸載函數*/void __exit xxx_exit(void){.....................free_irq(xxx_irq,xxx_interrupt);.....................}//工作隊列使用模板/*定義工作隊列和關聯函數*/struct work_struct xxx_wq;void xxx_do_work(unsigned long);/*中斷處理底半部*/void xxx_do_work(unsigned long){....................}/*中斷處理頂半部*/irqreturn_t xxx_interrupt(int irq,void *dev_id,struct pt_regs *regs){................schedule_work(&xxx_wq);...................}/*裝置驅動模組載入函數*/int xxx_init(void){................/*申請中斷*/result=request_irq(xxx_irq,xxx_interrupt,SA_INTERRUPT,"xxx",NULL);................./*初始化隊列*/INIT_WORK(&xxx_wq,(void (*)(void *)) xxx_do_work,NULL);.................}/*裝置驅動模組卸載函數*/void xxx_exit(void){.............../*釋放中斷*/free_irq(xxx_irq,xxx_interrupt);................}/*非強制中斷和tasklet仍然運行於中斷上下文，而工作隊列則運行於進程上下文。因此，非強制中斷和tasklet處理函數中不能睡眠，而工作隊列處理函數中允許睡眠。local_bh_disable()和local_bh_enbale()是核心中用于禁止和使能 中斷和tasklet底半部機制的函數*/