多個排隊和工作隊列

Question

我正在學習工作隊列來編寫linux內核中的下半部分。我想知道：如果中斷處理程序執行了兩次（因此調用schedule_work兩次），工作隊列處理程序會被調用一次還是兩次？

Answer 1

看起來像你的答案是在該函數的評論。

/** 
* schedule_work - put work task in global workqueue 
* @work: job to be done 
* 
* Returns zero if @work was already on the kernel-global workqueue and 
* non-zero otherwise. 
* 
* This puts a job in the kernel-global workqueue if it was not already 
* queued and leaves it in the same position on the kernel-global 
* workqueue otherwise. 
*/ 
int schedule_work(struct work_struct *work) 
{ 
     return queue_work(keventd_wq, work); 
}