mirror of
https://github.com/torvalds/linux.git
synced 2024-11-02 10:11:36 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
105 lines
2.9 KiB
C
105 lines
2.9 KiB
C
/*
|
|
* ALSA sequencer Memory Manager
|
|
* Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
|
|
*
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
#ifndef __SND_SEQ_MEMORYMGR_H
|
|
#define __SND_SEQ_MEMORYMGR_H
|
|
|
|
#include <sound/seq_kernel.h>
|
|
#include <linux/poll.h>
|
|
|
|
typedef struct pool pool_t;
|
|
|
|
/* container for sequencer event (internal use) */
|
|
typedef struct snd_seq_event_cell_t {
|
|
snd_seq_event_t event;
|
|
pool_t *pool; /* used pool */
|
|
struct snd_seq_event_cell_t *next; /* next cell */
|
|
} snd_seq_event_cell_t;
|
|
|
|
/* design note: the pool is a contigious block of memory, if we dynamicly
|
|
want to add additional cells to the pool be better store this in another
|
|
pool as we need to know the base address of the pool when releasing
|
|
memory. */
|
|
|
|
struct pool {
|
|
snd_seq_event_cell_t *ptr; /* pointer to first event chunk */
|
|
snd_seq_event_cell_t *free; /* pointer to the head of the free list */
|
|
|
|
int total_elements; /* pool size actually allocated */
|
|
atomic_t counter; /* cells free */
|
|
|
|
int size; /* pool size to be allocated */
|
|
int room; /* watermark for sleep/wakeup */
|
|
|
|
int closing;
|
|
|
|
/* statistics */
|
|
int max_used;
|
|
int event_alloc_nopool;
|
|
int event_alloc_failures;
|
|
int event_alloc_success;
|
|
|
|
/* Write locking */
|
|
wait_queue_head_t output_sleep;
|
|
|
|
/* Pool lock */
|
|
spinlock_t lock;
|
|
};
|
|
|
|
extern void snd_seq_cell_free(snd_seq_event_cell_t* cell);
|
|
|
|
int snd_seq_event_dup(pool_t *pool, snd_seq_event_t *event, snd_seq_event_cell_t **cellp, int nonblock, struct file *file);
|
|
|
|
/* return number of unused (free) cells */
|
|
static inline int snd_seq_unused_cells(pool_t *pool)
|
|
{
|
|
return pool ? pool->total_elements - atomic_read(&pool->counter) : 0;
|
|
}
|
|
|
|
/* return total number of allocated cells */
|
|
static inline int snd_seq_total_cells(pool_t *pool)
|
|
{
|
|
return pool ? pool->total_elements : 0;
|
|
}
|
|
|
|
/* init pool - allocate events */
|
|
int snd_seq_pool_init(pool_t *pool);
|
|
|
|
/* done pool - free events */
|
|
int snd_seq_pool_done(pool_t *pool);
|
|
|
|
/* create pool */
|
|
pool_t *snd_seq_pool_new(int poolsize);
|
|
|
|
/* remove pool */
|
|
int snd_seq_pool_delete(pool_t **pool);
|
|
|
|
/* init memory */
|
|
int snd_sequencer_memory_init(void);
|
|
|
|
/* release event memory */
|
|
void snd_sequencer_memory_done(void);
|
|
|
|
/* polling */
|
|
int snd_seq_pool_poll_wait(pool_t *pool, struct file *file, poll_table *wait);
|
|
|
|
|
|
#endif
|