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Diffstat (limited to 'kernel/sound/core/seq/seq_memory.h')
-rw-r--r-- | kernel/sound/core/seq/seq_memory.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/kernel/sound/core/seq/seq_memory.h b/kernel/sound/core/seq/seq_memory.h new file mode 100644 index 000000000..4a2ec779b --- /dev/null +++ b/kernel/sound/core/seq/seq_memory.h @@ -0,0 +1,107 @@ +/* + * 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> + +struct snd_info_buffer; + +/* container for sequencer event (internal use) */ +struct snd_seq_event_cell { + struct snd_seq_event event; + struct snd_seq_pool *pool; /* used pool */ + struct snd_seq_event_cell *next; /* next cell */ +}; + +/* design note: the pool is a contiguous 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 snd_seq_pool { + struct snd_seq_event_cell *ptr; /* pointer to first event chunk */ + struct snd_seq_event_cell *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; +}; + +void snd_seq_cell_free(struct snd_seq_event_cell *cell); + +int snd_seq_event_dup(struct snd_seq_pool *pool, struct snd_seq_event *event, + struct snd_seq_event_cell **cellp, int nonblock, struct file *file); + +/* return number of unused (free) cells */ +static inline int snd_seq_unused_cells(struct snd_seq_pool *pool) +{ + return pool ? pool->total_elements - atomic_read(&pool->counter) : 0; +} + +/* return total number of allocated cells */ +static inline int snd_seq_total_cells(struct snd_seq_pool *pool) +{ + return pool ? pool->total_elements : 0; +} + +/* init pool - allocate events */ +int snd_seq_pool_init(struct snd_seq_pool *pool); + +/* done pool - free events */ +int snd_seq_pool_done(struct snd_seq_pool *pool); + +/* create pool */ +struct snd_seq_pool *snd_seq_pool_new(int poolsize); + +/* remove pool */ +int snd_seq_pool_delete(struct snd_seq_pool **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(struct snd_seq_pool *pool, struct file *file, poll_table *wait); + +void snd_seq_info_pool(struct snd_info_buffer *buffer, + struct snd_seq_pool *pool, char *space); + +#endif |