Linux操作系统内核中工作队列的操作.docxVIP

Linux操作系统内核中工作队列的操作msn: yfydz_no1@来源：1. 前言工作队列(workqueue)的Linux内核中的定义的用来处理不是很紧急事件的回调方式处理方法.以下代码的linux内核版本为, 源代码文件主要为kernel/workqueue.c.2. 数据结构/* include/linux/workqueue.h */// 工作节点结构struct work_struct {// 等待时间unsigned long pending;// 链表节点struct list_head entry;// workqueue回调函数void (*func)(void *);// 回调函数func的数据void *data;// 指向CPU相关数据, 一般指向struct cpu_workqueue_struct结构void *wq_data;// 定时器struct timer_list timer;};struct execute_work {struct work_struct work;};/* kernel/workqueue.c *//** The per-CPU workqueue (if single thread, we always use the first* possible cpu).** The sequence counters are for flush_scheduled_work(). It wants to wait* until all currently-scheduled works are completed, but it doesnt* want to be livelocked by new, incoming ones. So it waits until* remove_sequence is = the insert_sequence which pertained when* flush_scheduled_work() was called.*/// 这个结构是针对每个CPU的struct cpu_workqueue_struct {// 结构锁spinlock_t lock;// 下一个要执行的节点序号long remove_sequence; /* Least-recently added (next to run) */// 下一个要插入节点的序号long insert_sequence; /* Next to add */// 工作机构链表节点struct list_head worklist;// 要进行处理的等待队列wait_queue_head_t more_work;// 处理完的等待队列wait_queue_head_t work_done;// 工作队列节点struct workqueue_struct *wq;// 进程指针struct task_struct *thread;int run_depth; /* Detect run_workqueue() recursion depth */} ____cacheline_aligned;/** The externally visible workqueue abstraction is an array of* per-CPU workqueues:*/// 工作队列结构struct workqueue_struct {struct cpu_workqueue_struct *cpu_wq;const char *name;struct list_head list; /* Empty if single thread */};kernel/workqueue.c中定义了一个工作队列链表,