include/heap.h

   1 /* $Id: heap.h,v 1.2 1993/07/04 04:04:21 root Exp root $
   2  */
   3 /*
   4  * Copyright  Robert J. Amstadt, 1993
   5  */
   6 #ifndef HEAP_H
   7 #define HEAP_H
   8
   9 /**********************************************************************
  10  * LOCAL HEAP STRUCTURES AND FUNCTIONS
  11  */
  12 typedef struct heap_mem_desc_s
  13 {
  14     struct heap_mem_desc_s *prev, *next;
  15     unsigned short length;
  16     unsigned char  lock;
  17     unsigned char  flags;
  18 } MDESC;
  19
  20 extern void HEAP_Init(MDESC **free_list, void *start, int length);
  21 extern void *HEAP_Alloc(MDESC **free_list, int flags, int bytes);
  22 extern int  HEAP_Free(MDESC **free_list, void *block);
  23 extern void *HEAP_ReAlloc(MDESC **free_list, void *old_block,
  24                           int new_size, unsigned int flags);
  25
  26 /**********************************************************************
  27  * GLOBAL HEAP STRUCTURES AND FUNCTIONS:
  28  *
  29  * Global memory pool descriptor.  Segments MUST be maintained in segment
  30  * ascending order.  If not the reallocation routine will die a horrible
  31  * death.
  32  *
  33  * handle  = 0, this descriptor contains the address of a free pool.
  34  *        != 0, this describes an allocated block.
  35  *
  36  * sequence = 0, this is not a huge block
  37  *          > 0, this is a portion of a huge block
  38  *          =-1, this is a free segment
  39  *
  40  * addr       - address of this memory block.
  41  *
  42  * length     - used to maintain huge blocks.
  43  */
  44 typedef struct global_mem_desc_s
  45 {
  46     struct global_mem_desc_s *next;
  47     struct global_mem_desc_s *prev;
  48     unsigned short handle;
  49     short sequence;
  50     void *addr;
  51     int length;
  52     int lock_count;
  53     void *linear_addr;
  54     int linear_key;
  55     int linear_count;
  56 } GDESC;
  57
  58 extern GDESC *GlobalList;
  59
  60 extern void *GlobalQuickAlloc(int size);
  61 extern unsigned int GlobalHandleFromPointer(void *block);
  62 extern GDESC *GlobalGetGDesc(unsigned int block);
  63 extern void *GlobalLinearLock(unsigned int block);
  64 extern unsigned int GlobalLinearUnlock(unsigned int block);
  65
  66 #endif /* HEAP_H */