sem_obtain_object

Name:sem_lock_(check_) routines are called in the paths where the rwsem* is not held.* The caller holds the RCU read lock.

Proto:static inline struct sem_array *sem_obtain_object(struct ipc_namespace *ns, int id)

Type:struct sem_array

Parameter:

Type	Parameter	Name
struct ipc_namespace *	ns
int	id

458

ipcp = pc_obtain_object_idr*@ids: ipc identifier set*@id: ipc id to look for* Look for an id in the ipc ids idr and return associated ipc object.* Call inside the RCU critical section.* The ipc object is *not* locked on exit.

460

If IS_ERR(ipcp) Then Return ERR_CAST - Explicitly cast an error-valued pointer to another pointer type*@ptr: The pointer to cast.* Explicitly cast an error-valued pointer to another pointer type in such a* way as to make it clear that's what's going on.

463

Return 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.(ipcp, structsem_array, sem_perm)

**Caller**
Name	Describe
semctl_stat

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