shmarea.c File Reference

shared memory helpers More...

Functions
struct snd_shm_area *	snd_shm_area_create (int shmid, void *ptr)
	Create a shm area record.
struct snd_shm_area *	snd_shm_area_share (struct snd_shm_area *area)
	Increase the reference counter of shm area record.
int	snd_shm_area_destroy (struct snd_shm_area *area)
	Release the shared area record.

Detailed Description

shared memory helpers

Author

Jaroslav Kysela perex.nosp@m.@per.nosp@m.ex.cz

Date

2001

Shared memory helpers

Function Documentation

snd_shm_area_create()

struct snd_shm_area * snd_shm_area_create	(	int	shmid,
		void *	ptr )

Create a shm area record.

Parameters

shmid	IPC SHM ID
ptr	the shared area pointer

Returns

The allocated shm area record, NULL if fail

Allocates a shared area record with the given SHM ID and pointer. The record has a reference counter, which is initialized to 1 by this function.

snd_shm_area_destroy()

int snd_shm_area_destroy

(

struct snd_shm_area *

area

)

Release the shared area record.

Parameters

area	the shared are record

Returns

0 if successful, or a negative error code

Decreases the reference counter of the given shared area record, and releases the resources automaticall if it reaches to 0.

snd_shm_area_share()

struct snd_shm_area * snd_shm_area_share

(

struct snd_shm_area *

area

)

Increase the reference counter of shm area record.

Parameters

area	shm area record

Returns

the shm area record (identical with the argument)

Increases the reference counter of the given shared area record.