内核线程同步之completion
Completion，完成量，用于多线程间同步，即线程A要往下执行需要等待线程B执行到指定代码后才继续执行，这时就可以使用该机制，用于一个线程告诉另一个线程指定工作已完成。 在Linux Kernel源码include/linux/completion.h文件里有相关的结构体和接口函数的定义和声明，从结构体可以看到其是基于等待队列机制实现的，该机制后期再了解，下面是completion相关内容： struct completion { unsigned int done; wait_queue_head_t wait; }; static inline void init_completion(struct completion *x) ; static inline void reinit_completion(struct completion *x); extern void wait_for_completion(struct completion *); extern int wait_for_completion_interruptible(struct completion *x); extern int wait_for_completion_killable(struct completion *x); extern unsigned long wait_for_completion_timeout(struct completion *x, unsigned long timeout); extern long wait_for_completion_interruptible_timeout( struct completion *x, unsigned long timeout); extern long wait_for_completion_killable_timeout( struct completion *x, unsigned long timeout); extern bool try_wait_for_completion(struct completion *x); extern bool completion_done(struct c...