ipc_idr_alloc

函数名称：Insert new IPC object into idr tree, and set sequence number and id* in the correct order.* Especially:* - the sequence number must be set before inserting the object into the idr,* because the sequence number is accessed without a lock.

函数原型：static inline int ipc_idr_alloc(struct ipc_ids *ids, struct kern_ipc_perm *new)

返回类型：int

参数：

类型	参数	名称
struct ipc_ids *	ids
struct kern_ipc_perm *	new

203

next_id等于负1

222

如果next_id小于0则

225

max_idx等于两数取大(in_use * 3 / 2, ipc_min_cycle)

226

max_idx等于两数取小(max_idx, ipc_mni)

229

idx等于dr_alloc_cyclic() - Allocate an ID cyclically.*@idr: IDR handle.*@ptr: Pointer to be associated with the new ID.*@start: The minimum ID (inclusive).*@end: The maximum ID (exclusive).*@gfp: Memory allocation flags.

232

如果idx大于等于0则

238

如果idx小于等于last_idx则

239

seq自加

240

如果seq大于等于ipcid_seq_max()则seq等于0

243

last_idx等于idx

245

seq等于seq

250

dr_replace() - replace pointer for given ID

252

否则

253

seq等于ipcid_to_seqx(next_id)

254

idx等于dr_alloc() - Allocate an ID.*@idr: IDR handle.*@ptr: Pointer to be associated with the new ID.*@start: The minimum ID (inclusive).*@end: The maximum ID (exclusive).*@gfp: Memory allocation flags.

257

如果idx大于等于0则id等于seq左移ipcmni_seq_shift()位的值加idx

259

返回:idx

**调用者**
名称	描述
ipc_addid	pc_addid - add an ipc identifier@ids: ipc identifier set@new: new ipc permission set@limit: limit for the number of used ids Add an entry 'new' to the ipc ids idr

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