include/shm_fragment.h

   1 /***************************************************************************
   2  * Copyright 1995, Technion, Israel Institute of Technology
   3  * Electrical Eng, Software Lab.
   4  * Author:    Michael Veksler.
   5  ***************************************************************************
   6  * File:      shm_fragment.h
   7  * Purpose:   Data fragments and free list items. Allocate and free blocks.
   8  ***************************************************************************
   9  */
  10 #ifndef __WINE_SHM_FRAGMENT_H
  11 #define __WINE_SHM_FRAGMENT_H
  12
  13 #ifdef CONFIG_IPC
  14
  15 #include "shm_block.h"
  16
  17 #define NIL ((int) 0)
  18 /* memory fragment: used or free (when free - it's an item of "free list",
  19  * when allocated it contains the data, and it's size)
  20  */
  21 struct shm_fragment {
  22         int size;               /* fragment's size */
  23
  24         /* The type of info depends on fragment's status (free/allocated) */
  25         union info {
  26                 int next;       /* next free fragment */
  27                 char data[1];   /* the data */
  28         } info;
  29 };
  30
  31 /* setup first item in the free list */
  32 void shm_FragmentInit(struct shm_block *block,REL_PTR first,int size);
  33
  34 /* allocate shm fragment. return: offset to data in fragment, or NULL */
  35 REL_PTR shm_FragmentAlloc(struct shm_block *block, int size);
  36
  37 /* like shm_FragmentAlloc, returns pointer instead of offset */
  38 char *shm_FragPtrAlloc(struct shm_block *block, int size);
  39
  40 /* free shm fragment - according to offset */
  41 void shm_FragmentFree(struct shm_block *block, int ofs);
  42
  43 /* free shm fragment - according to pointer */
  44 void shm_FragPtrFree(struct shm_block *block, void *ptr);
  45
  46 /* This is used for debugging only */
  47 void shm_print_free_list(struct shm_block *block);
  48
  49 #endif  /* CONFIG_IPC */
  50
  51 #endif /* __WINE_SHM_FRAGMENT_H */