You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
88 lines
2.8 KiB
88 lines
2.8 KiB
/* GSL - Generic Sound Layer
|
|
* Copyright (C) 2001 Tim Janik
|
|
*
|
|
* 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 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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., 51 Franklin Street, Fifth Floor,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
#ifndef __GSL_DATA_CACHE_H__
|
|
#define __GSL_DATA_CACHE_H__
|
|
|
|
#include <gsl/gslcommon.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif /* __cplusplus */
|
|
|
|
|
|
/* --- macros --- */
|
|
#define GSL_DATA_CACHE_NODE_SIZE(dcache) (((GslDataCache*) (dcache))->node_size)
|
|
|
|
|
|
/* --- typedefs & structures --- */
|
|
typedef gfloat GslDataType;
|
|
typedef struct _GslDataCacheNode GslDataCacheNode;
|
|
struct _GslDataCache
|
|
{
|
|
GslDataHandle *dhandle;
|
|
guint open_count;
|
|
GslMutex mutex;
|
|
guint ref_count;
|
|
guint node_size; /* power of 2, const for all dcaches */
|
|
guint padding; /* n_values around blocks */
|
|
guint max_age;
|
|
gboolean low_persistency;
|
|
guint n_nodes;
|
|
GslDataCacheNode **nodes;
|
|
};
|
|
struct _GslDataCacheNode
|
|
{
|
|
gsize offset;
|
|
guint ref_count;
|
|
guint age;
|
|
GslDataType *data; /* NULL while busy */
|
|
};
|
|
typedef enum
|
|
{
|
|
GSL_DATA_CACHE_REQUEST = FALSE, /* node->data may be NULL and will be filled */
|
|
GSL_DATA_CACHE_DEMAND_LOAD = TRUE, /* blocks until node->data != NULL */
|
|
GSL_DATA_CACHE_PEEK = 2 /* may return NULL node, data != NULL otherwise */
|
|
} GslDataCacheRequest;
|
|
|
|
|
|
/* --- prototypes --- */
|
|
GslDataCache* gsl_data_cache_new (GslDataHandle *dhandle,
|
|
guint padding);
|
|
GslDataCache* gsl_data_cache_ref (GslDataCache *dcache);
|
|
void gsl_data_cache_unref (GslDataCache *dcache);
|
|
void gsl_data_cache_open (GslDataCache *dcache);
|
|
void gsl_data_cache_close (GslDataCache *dcache);
|
|
GslDataCacheNode* gsl_data_cache_ref_node (GslDataCache *dcache,
|
|
gsize offset,
|
|
GslDataCacheRequest load_request);
|
|
void gsl_data_cache_unref_node (GslDataCache *dcache,
|
|
GslDataCacheNode *node);
|
|
void gsl_data_cache_free_olders (GslDataCache *dcache,
|
|
guint max_age);
|
|
GslDataCache* gsl_data_cache_from_dhandle (GslDataHandle *dhandle,
|
|
guint min_padding);
|
|
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif /* __cplusplus */
|
|
|
|
#endif /* __GSL_DATA_CACHE_H__ */
|