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 00000000000..6c4dde5d3d6
--- /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