Name

ipc_lock — Lock an ipc structure without rw_mutex held

Synopsis

struct kern_ipc_perm * ipc_lock (struct ipc_ids *  ids,
 int  id);

Arguments

ids

IPC identifier set

id

ipc id to look for

Description

Look for an id in the ipc ids idr and lock the associated ipc object.

The ipc object is locked on exit.

This is the routine that should be called when the rw_mutex is not already held, i.e. idr tree not protected: it protects the idr tree in read mode during the idr_find.