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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /sound/core/seq/seq_memory.h | |
download | op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz |
Linux-2.6.12-rc2v2.6.12-rc2
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!
Diffstat (limited to 'sound/core/seq/seq_memory.h')
-rw-r--r-- | sound/core/seq/seq_memory.h | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/sound/core/seq/seq_memory.h b/sound/core/seq/seq_memory.h new file mode 100644 index 0000000..6c4dde5 --- /dev/null +++ b/sound/core/seq/seq_memory.h @@ -0,0 +1,104 @@ +/* + * 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 |