for_each_process

for_each_process是宏循环控制语句，内核开发者可它扫描整个进程链表。

/**
 * list_entry - get the struct for this entry
 * @ptr:	the &struct list_head pointer.
 * @type:	the type of the struct this is embedded in.
 * @member:	the name of the list_struct within the struct.
 */
/** 
 * 返回链表结构
 */
#define list_entry(ptr, type, member) 
	container_of(ptr, type, member)

/**
 * container_of - cast a member of a structure out to the containing structure
 *
 * @ptr:	the pointer to the member.
 * @type:	the type of the container struct this is embedded in.
 * @member:	the name of the member within the struct.
 *
 */
#define container_of(ptr, type, member) ({			
        const typeof( ((type *)0)->member ) *__mptr = (ptr);	
        (type *)( (char *)__mptr - offsetof(type,member) );})	
	
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)	
	
#define next_task(p)	list_entry((p)->tasks.next, struct task_struct, tasks)

#define for_each_process(p) 
	for (p = &init_task ; (p = next_task(p)) != &init_task ; )

详细可参考：http://www.cnblogs.com/sdphome/archive/2011/09/14/2176624.html

                      http://www.cnblogs.com/hicjiajia/archive/2012/07/01/2571791.html

                      http://radek.io/2012/11/10/magical-container_of-macro/

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