ip51_dm_defs.h

基于51的动态内存管理

/*************************************************************************/
/*                                                                       */
/*               Copyright Mentor Graphics Corporation 2002              */
/*                         All Rights Reserved.                          */
/*                                                                       */
/* THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION WHICH IS  */
/* THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS AND IS   */
/* SUBJECT TO LICENSE TERMS.                                             */
/*                                                                       */
/*************************************************************************/

/*************************************************************************/
/*                                                                       */
/* FILE NAME                                               VERSION       */
/*                                                                       */
/*      dm_defs.h                                      Nucleus PLUS 1.14 */
/*                                                                       */
/* COMPONENT                                                             */
/*                                                                       */
/*      DM - Dynamic Memory Management                                   */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This file contains data structure definitions and constants for  */
/*      the Dynamic Memory component.                                    */
/*                                                                       */
/* DATA STRUCTURES                                                       */
/*                                                                       */
/*      DM_PCB                              Dynamic Pool control block   */
/*      DM_HEADER                           Header of each memory block  */
/*      DM_SUSPEND                          Memory suspension block      */
/*                                                                       */
/* FUNCTIONS                                                             */
/*                                                                       */
/*      None                                                             */
/*                                                                       */
/* DEPENDENCIES                                                          */
/*                                                                       */
/*      cs_defs.h                           Common service definitions   */
/*      tc_defs.h                           Thread Control definitions   */
/*                                                                       */
/* HISTORY                                                               */
/*                                                                       */
/*         DATE                    REMARKS                               */
/*                                                                       */
/*      03-01-1993      Created initial version 1.0                      */
/*      04-19-1993      Verified version 1.0                             */
/*      03-01-1994      Moved include files outside of                   */
/*                      the file #ifndef to allow the                    */
/*                      use of actual data structures,                   */
/*                      added padding logic,                             */
/*                      resulting in version 1.1                         */
/*                                                                       */
/*      03-18-1994      Verified version 1.1                             */
/*      04-17-1996      updated to version 1.2                           */
/*      01-07-1997      Added missing PAD_1 field to                     */
/*                      DM_HEADER_STRUCT to be                           */
/*                      consistent with other PLUS                       */
/*                      structures creating 1.2a.                        */
/*      03-24-1998      Released version 1.3.                            */
/*      03-26-1999      Released 1.11m (new release                      */
/*                        numbering scheme)                              */
/*      04-17-2002      Released version 1.13m                           */
/*      11-07-2002      Released version 1.14                            */
/*************************************************************************/

#include        "ip51_cs_defs.h"                 /* Common service constants  */

/* Check to see if the file has been included already.  */

#ifndef DM_DEFS
#define DM_DEFS


/* Adjust a size to something that is evenly divisible by the number of bytes
   in an UNSIGNED data type.  */

#define DM_ADJUSTED_SIZE(size) \
  ((((size) + sizeof(UNSIGNED) - 1)/sizeof(UNSIGNED)) * sizeof(UNSIGNED))

#define DM_ADJUSTED_ALIGNMENT(alignment) DM_ADJUSTED_SIZE(alignment)

/* Define constants local to this component.  */
#define			NULL				   0
#define			TRUE				   1
#define			FALSE				   0

#define         DM_DYNAMIC_ID          0x4e41
#define         DM_OVERHEAD            sizeof(DM_HEADER)
#define			DM_MAX_NAME			   5

//定义动态内存块控制块结构

typedef struct DM_PCB_STRUCT 
{
    CS_NODE             dm_created;            /* Node for linking to    */
                                               /* created dynamic pools  */
    unsigned int        dm_id;                 /* Internal PCB ID        */
    char                dm_name[DM_MAX_NAME];  /* Dynamic Pool name      */
    void               *dm_start_address;      /* Starting pool address  */
    unsigned int        dm_pool_size;          /* Size of pool           */
    unsigned int        dm_min_allocation;     /* Minimum allocate size  */
    unsigned int        dm_available;          /* Total available bytes  */
    struct DM_HEADER_STRUCT    
                       *dm_memory_list;        /* Memory list            */
    struct DM_HEADER_STRUCT
                       *dm_search_ptr;         /* Search pointer         */
//    BOOLEAN             dm_fifo_suspend;       /* Suspension type flag   */
} DM_PCB;    


//定义一个放在每个内存块的起始处的头结构
typedef struct DM_HEADER_STRUCT
{
    struct DM_HEADER_STRUCT
                       *dm_next_memory,        /* Next memory block      */
                       *dm_previous_memory;    /* Previous memory block  */
    unsigned char       dm_memory_free;        /* Memory block free flag */
    DM_PCB             *dm_memory_pool;        /* Dynamic pool pointer   */
} DM_HEADER;

typedef int STATUS;

typedef unsigned char * BYTE_PTR;

typedef DM_PCB      IP51_MEMORY_POOL;
/* Define the dynamic memory suspension structure.  This structure is 
   allocated off of the caller's stack.  */
   
typedef struct DM_SUSPEND_STRUCT
{
    CS_NODE             dm_suspend_link;       /* Link to suspend blocks */
    DM_PCB             *dm_memory_pool;        /* Pointer to pool        */
    unsigned int        dm_request_size;       /* Size of memory request */
    void               *dm_return_pointer;     /* Return memory address  */
    STATUS              dm_return_status;      /* Return status          */
} DM_SUSPEND;

//status
#define	SUCCESS			 1
#define IP51_NO_MEMORY		-1
#define IP51_INVALID_POOL	-2

#endif