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#ifndef foopulsememblockhfoo
#define foopulsememblockhfoo
/* $Id$ */
/***
This file is part of PulseAudio.
PulseAudio 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 2.1 of the
License, or (at your option) any later version.
PulseAudio 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 PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#include <sys/types.h>
#include <inttypes.h>
#include <pulsecore/llist.h>
/* A pa_memblock is a reference counted memory block. PulseAudio
* passed references to pa_memblocks around instead of copying
* data. See pa_memchunk for a structure that describes parts of
* memory blocks. */
/* The type of memory this block points to */
typedef enum pa_memblock_type {
PA_MEMBLOCK_POOL, /* Memory is part of the memory pool */
PA_MEMBLOCK_POOL_EXTERNAL, /* Data memory is part of the memory pool but the pa_memblock structure itself not */
PA_MEMBLOCK_APPENDED, /* the data is appended to the memory block */
PA_MEMBLOCK_USER, /* User supplied memory, to be freed with free_cb */
PA_MEMBLOCK_FIXED, /* data is a pointer to fixed memory that needs not to be freed */
PA_MEMBLOCK_IMPORTED, /* Memory is imported from another process via shm */
PA_MEMBLOCK_TYPE_MAX
} pa_memblock_type_t;
typedef struct pa_memblock pa_memblock;
typedef struct pa_mempool pa_mempool;
typedef struct pa_mempool_stat pa_mempool_stat;
typedef struct pa_memimport_segment pa_memimport_segment;
typedef struct pa_memimport pa_memimport;
typedef struct pa_memexport pa_memexport;
typedef void (*pa_memimport_release_cb_t)(pa_memimport *i, uint32_t block_id, void *userdata);
typedef void (*pa_memexport_revoke_cb_t)(pa_memexport *e, uint32_t block_id, void *userdata);
struct pa_memblock {
pa_memblock_type_t type;
int read_only; /* boolean */
unsigned ref; /* the reference counter */
size_t length;
void *data;
pa_mempool *pool;
union {
struct {
void (*free_cb)(void *p); /* If type == PA_MEMBLOCK_USER this points to a function for freeing this memory block */
} user;
struct {
uint32_t id;
pa_memimport_segment *segment;
} imported;
} per_type;
};
struct pa_mempool_stat {
unsigned n_allocated;
unsigned n_accumulated;
unsigned n_imported;
unsigned n_exported;
size_t allocated_size;
size_t accumulated_size;
size_t imported_size;
size_t exported_size;
unsigned n_too_large_for_pool;
unsigned n_pool_full;
unsigned n_allocated_by_type[PA_MEMBLOCK_TYPE_MAX];
unsigned n_accumulated_by_type[PA_MEMBLOCK_TYPE_MAX];
};
/* Allocate a new memory block of type PA_MEMBLOCK_MEMPOOL or PA_MEMBLOCK_APPENDED, depending on the size */
pa_memblock *pa_memblock_new(pa_mempool *, size_t length);
/* Allocate a new memory block of type PA_MEMBLOCK_MEMPOOL. If the requested size is too large, return NULL */
pa_memblock *pa_memblock_new_pool(pa_mempool *, size_t length);
/* Allocate a new memory block of type PA_MEMBLOCK_USER */
pa_memblock *pa_memblock_new_user(pa_mempool *, void *data, size_t length, void (*free_cb)(void *p), int read_only);
/* A special case of pa_memblock_new_user: take a memory buffer previously allocated with pa_xmalloc() */
#define pa_memblock_new_malloced(p,data,length) pa_memblock_new_user(p, data, length, pa_xfree, 0)
/* Allocate a new memory block of type PA_MEMBLOCK_FIXED */
pa_memblock *pa_memblock_new_fixed(pa_mempool *, void *data, size_t length, int read_only);
void pa_memblock_unref(pa_memblock*b);
pa_memblock* pa_memblock_ref(pa_memblock*b);
/* This special unref function has to be called by the owner of the
memory of a static memory block when he wants to release all
references to the memory. This causes the memory to be copied and
converted into a PA_MEMBLOCK_DYNAMIC type memory block */
void pa_memblock_unref_fixed(pa_memblock*b);
/* The memory block manager */
pa_mempool* pa_mempool_new(int shared);
void pa_mempool_free(pa_mempool *p);
const pa_mempool_stat* pa_mempool_get_stat(pa_mempool *p);
void pa_mempool_vacuum(pa_mempool *p);
int pa_mempool_get_shm_id(pa_mempool *p, uint32_t *id);
int pa_mempool_is_shared(pa_mempool *p);
/* For recieving blocks from other nodes */
pa_memimport* pa_memimport_new(pa_mempool *p, pa_memimport_release_cb_t cb, void *userdata);
void pa_memimport_free(pa_memimport *i);
pa_memblock* pa_memimport_get(pa_memimport *i, uint32_t block_id, uint32_t shm_id, size_t offset, size_t size);
int pa_memimport_process_revoke(pa_memimport *i, uint32_t block_id);
/* For sending blocks to other nodes */
pa_memexport* pa_memexport_new(pa_mempool *p, pa_memexport_revoke_cb_t cb, void *userdata);
void pa_memexport_free(pa_memexport *e);
int pa_memexport_put(pa_memexport *e, pa_memblock *b, uint32_t *block_id, uint32_t *shm_id, size_t *offset, size_t *size);
int pa_memexport_process_release(pa_memexport *e, uint32_t id);
#endif
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