get_undo

函数名称：If the task doesn't already have a undo_list, then allocate one* here. We guarantee there is only one thread using this undo list,* and current is THE ONE* If this allocation and assignment succeeds, but later

函数原型：static inline int get_undo_list(struct sem_undo_list **undo_listp)

返回类型：int

参数：

类型	参数	名称
struct sem_undo_list **	undo_listp

1836

undo_list等于undo_list

1837

如果非undo_list则

1838

undo_list等于分配内存并置零

1839

如果(undo_list == NULL)则返回:负ENOMEM

1841

spin_lock_init( & lock)

1842

_set - set a refcount's value*@r: the refcount*@n: value to which the refcount will be set

1843

初始化链表头

1845

undo_list等于undo_list

1847

undo_listp等于undo_list

1848

返回:0

**调用者**
名称	描述
find_alloc_undo	d_alloc_undo - lookup (and if not present create) undo array@ns: namespace@semid: semaphore array id* The function looks up (and if not present creates) the undo structure.* The size of the undo structure depends on the size of the semaphore
copy_semundo	重置信号量

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告