Sweden-Number/include/shm_fragment.h

52 lines
1.6 KiB
C

/***************************************************************************
* Copyright 1995, Technion, Israel Institute of Technology
* Electrical Eng, Software Lab.
* Author: Michael Veksler.
***************************************************************************
* File: shm_fragment.h
* Purpose: Data fragments and free list items. Allocate and free blocks.
***************************************************************************
*/
#ifndef __WINE_SHM_FRAGMENT_H
#define __WINE_SHM_FRAGMENT_H
#ifdef CONFIG_IPC
#include "shm_block.h"
#define NIL ((int) 0)
/* memory fragment: used or free (when free - it's an item of "free list",
* when allocated it contains the data, and it's size)
*/
struct shm_fragment {
int size; /* fragment's size */
/* The type of info depends on fragment's status (free/allocated) */
union info {
int next; /* next free fragment */
char data[1]; /* the data */
} info;
};
/* setup first item in the free list */
void shm_FragmentInit(struct shm_block *block,REL_PTR first,int size);
/* allocate shm fragment. return: offset to data in fragment, or NULL */
REL_PTR shm_FragmentAlloc(struct shm_block *block, int size);
/* like shm_FragmentAlloc, returns pointer instead of offset */
char *shm_FragPtrAlloc(struct shm_block *block, int size);
/* free shm fragment - according to offset */
void shm_FragmentFree(struct shm_block *block, int ofs);
/* free shm fragment - according to pointer */
void shm_FragPtrFree(struct shm_block *block, void *ptr);
/* This is used for debugging only */
void shm_print_free_list(struct shm_block *block);
#endif /* CONFIG_IPC */
#endif /* __WINE_SHM_FRAGMENT_H */