Sweden-Number/include/shm_block.h

91 lines
2.9 KiB
C

/***************************************************************************
* Copyright 1995, Technion, Israel Institute of Technology
* Electrical Eng, Software Lab.
* Author: Michael Veksler.
***************************************************************************
* File: shm_block.ch
* Purpose: treat a shared memory block.
***************************************************************************
*/
#ifndef __WINE_SHM_BLOCK_H
#define __WINE_SHM_BLOCK_H
#ifdef CONFIG_IPC
#include <sys/shm.h>
#include "wintypes.h"
#define SEGSIZE 0x10000 /* 64 */
#define SHM_GRANULARITY SEGSIZE
#define SHM_MINBLOCK SHM_GRANULARITY
#define SHM_MAXBLOCK (((int)SHMMAX/(int)SHM_GRANULARITY)* \
SHM_GRANULARITY)
#define PTR2REL(block,ptr) (REL_PTR) ( (char *) (ptr) - (char *) (block) )
#define REL2PTR(block,rel) (void *) ( (char *) (block) + (rel) )
typedef int REL_PTR;
/* full info for each shm block. */
struct shm_block {
/* private */
int next_shm_id; /* IPC shm ID (for initial linking) */
/* public (read only) */
int size; /* size of the shm block */
int free; /* how much of the block is free */
int proc_idx; /* The index of the owner */
/* public - writable for shm_fragment */
REL_PTR free_list; /* first item in the free list */
};
/* used for mapping local attachments */
struct local_shm_map {
struct local_shm_map *next;
int shm_id;
int proc_idx;
/* 32 bit pointer to the beginning of the block */
struct shm_block *ptr;
};
extern struct local_shm_map *shm_map;
void shm_setup_block(struct shm_block *block, REL_PTR first, int size);
/* shm_create_block:
* allocate and setup a new block:
* first - first non header byte.
* size - block size (in bytes).
* shm_id- IPC shared memory ID.
*/
struct shm_block *shm_create_block(REL_PTR first, int size, int *shm_id);
/* shm_locate_block:
* locate existing block according to shm_id,
* Attach the block if needed. Assume the shm_id is wine's
* Set selectors also.
*/
struct shm_block *shm_locate_block(int shm_id, struct local_shm_map *map);
/* shm_locate_attached_block:
* locate existing block according to shm_id,
* Blocks are never attached.
* if proc_idx is not NULL, it will be set to owner's index.
* map - localy mapped info about block may be NULL;
*/
struct shm_block *shm_locate_attached_block(int shm_id,
struct local_shm_map *map);
/* shm_attach_block: attach existing shm block, setup selectors
* shm_id - id of the block to attach.
* proc_idx - if not -1, puts this data into local mapping
* map - localy mapped info about this block. (may be NULL)
* NOTE: same block can be attached many times
*/
struct shm_block *shm_attach_block(int shm_id, int proc_idx,
struct local_shm_map *map);
/* delete chain of shm blocks (pointing to each other */
void shm_delete_chain(int *shmid);
#endif /* CONFIG_IPC */
#endif /* __WINE_SHM_BLOCK_H */