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