diff options
Diffstat (limited to 'alsa-lib/src/shmarea.c')
-rw-r--r-- | alsa-lib/src/shmarea.c | 108 |
1 files changed, 0 insertions, 108 deletions
diff --git a/alsa-lib/src/shmarea.c b/alsa-lib/src/shmarea.c deleted file mode 100644 index 071f9f3..0000000 --- a/alsa-lib/src/shmarea.c +++ /dev/null @@ -1,108 +0,0 @@ -/* - * IPC SHM area manager - * Copyright (c) 2003 by Jaroslav Kysela <perex@perex.cz> - * - * This library is free software; you can redistribute it and/or modify - * it under the terms of the GNU Lesser General Public License as - * published by the Free Software Foundation; either version 2.1 of - * the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - */ - -#include <stdio.h> -#include <malloc.h> -#include <string.h> -#include <errno.h> -#include <sys/poll.h> -#include <sys/mman.h> -#include <sys/shm.h> -#include "list.h" - -#ifndef DOC_HIDDEN -struct snd_shm_area { - struct list_head list; - int shmid; - void *ptr; - int share; -}; -#endif - -static LIST_HEAD(shm_areas); - -/** - * \brief Create a shm area record - * \param shmid IPC SHM ID - * \param ptr the shared area pointer - * \return 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. - */ -struct snd_shm_area *snd_shm_area_create(int shmid, void *ptr) -{ - struct snd_shm_area *area = malloc(sizeof(*area)); - if (area) { - area->shmid = shmid; - area->ptr = ptr; - area->share = 1; - list_add_tail(&area->list, &shm_areas); - } - return area; -} - -/** - * \brief Increase the reference counter of shm area record - * \param area shm area record - * \return the shm area record (identical with the argument) - * - * Increases the reference counter of the given shared area record. - */ -struct snd_shm_area *snd_shm_area_share(struct snd_shm_area *area) -{ - if (area == NULL) - return NULL; - area->share++; - return area; -} - -/** - * \brief Release the shared area record - * \param area the shared are record - * \return 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. - */ -int snd_shm_area_destroy(struct snd_shm_area *area) -{ - if (area == NULL) - return -ENOENT; - if (--area->share) - return 0; - list_del(&area->list); - shmdt(area->ptr); - free(area); - return 0; -} - -void snd_shm_area_destructor(void) __attribute__ ((destructor)); - -void snd_shm_area_destructor(void) -{ - struct list_head *pos; - struct snd_shm_area *area; - - list_for_each(pos, &shm_areas) { - area = list_entry(pos, struct snd_shm_area, list); - shmdt(area->ptr); - } -} |