Function report |
Source Code:ipc\sem.c |
Create Date:2022-07-28 16:45:14 |
Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
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Name: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
Proto:static inline int get_undo_list(struct sem_undo_list **undo_listp)
Type:int
Parameter:
Type | Parameter | Name |
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struct sem_undo_list ** | undo_listp |
1837 | If Not undo_list Then |
1838 | undo_list = kzalloc - allocate memory. The memory is set to zero.*@size: how many bytes of memory are required.*@flags: the type of memory to allocate (see kmalloc). |
1841 | Process spin lock initialization( & lock) |
1847 | undo_listp = undo_list |
1848 | Return 0 |
Name | Describe |
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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 | If CLONE_SYSVSEM is set, establish sharing of SEM_UNDO state between* parent and child tasks. |
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