dmf.c

不可多得Nucleus plus的源代码程序

UNSIGNED  DMF_Memory_Pool_Pointers(NU_MEMORY_POOL **pointer_list,
                                                UNSIGNED maximum_pointers)
{

CS_NODE         *node_ptr;                  /* Pointer to each PCB       */
UNSIGNED         pointers;                  /* Number of pointers in list*/


#ifdef  NU_ENABLE_STACK_CHECK

    /* Call stack checking function to check for an overflow condition.  */
    TCT_Check_Stack();

#endif

    /* Initialize the number of pointers returned.  */
    pointers =  0;
    
    /* Protect against access to the list of created memory pools.  */
    TCT_Protect(&DMD_List_Protect);

    /* Loop until all pool pointers are in the list or until the maximum 
       list size is reached.  */
    node_ptr =  DMD_Created_Pools_List;
    while ((node_ptr) && (pointers < maximum_pointers))
    {
    
        /* Place the node into the destination list.  */
        *pointer_list++ =  (NU_MEMORY_POOL *) node_ptr;
        
        /* Increment the pointers variable.  */
        pointers++;

        /* Position the node pointer to the next node.  */
        node_ptr =  node_ptr -> cs_next;
        
        /* Determine if the pointer is at the head of the list.  */
        if (node_ptr == DMD_Created_Pools_List)
        
            /* The list search is complete.  */
            node_ptr =  NU_NULL;
    } 

    /* Release protection of the list of created pools.  */                
    TCT_Unprotect();

    /* Return the number of pointers in the list.  */
    return(pointers);
}


/*************************************************************************/
/*                                                                       */
/* FUNCTION                                                              */
/*                                                                       */
/*      DMF_Memory_Pool_Information                                      */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This function returns information about the specified memory     */
/*      pool.  However, if the supplied memory pool pointer is           */
/*      invalid, the function simply returns an error status.            */
/*                                                                       */
/* AUTHOR                                                                */
/*                                                                       */
/*      William E. Lamie, Accelerated Technology, Inc.                   */
/*                                                                       */
/* CALLED BY                                                             */
/*                                                                       */
/*      Application                                                      */
/*                                                                       */
/* CALLS                                                                 */
/*                                                                       */
/*      [TCT_Check_Stack]                   Stack checking function      */
/*      TCT_Protect                         Protect memory pool          */
/*      TCT_Unprotect                       Release protection           */
/*                                                                       */
/* INPUTS                                                                */
/*                                                                       */
/*      pool_ptr                            Pointer to the memory pool   */
/*      name                                Destination for the name     */
/*      start_address                       Destination for the starting */
/*                                            memory address of the pool */
/*      pool_size                           Destination for the pool's   */
/*                                            total size                 */
/*      min_allocation                      Destination for the minimum  */
/*                                            block allocation size      */
/*      available                           Destination for the available*/
/*                                            number of bytes in pool    */
/*      suspend_type                        Destination for the type of  */
/*                                            suspension                 */
/*      tasks_waiting                       Destination for the tasks    */
/*                                            waiting count              */
/*      first_task                          Destination for the pointer  */
/*                                            to the first task waiting  */
/*                                                                       */
/* OUTPUTS                                                               */
/*                                                                       */
/*      NU_SUCCESS                          If a valid pool pointer      */
/*                                            is supplied                */
/*      NU_INVALID_POOL                     If pool pointer invalid      */
/*                                                                       */
/* HISTORY                                                               */
/*                                                                       */
/*         NAME            DATE                    REMARKS               */
/*                                                                       */
/*      W. Lamie        03-01-1993      Created initial version 1.0      */
/*      D. Lamie        04-19-1993      Verified version 1.0             */
/*      W. Lamie        03-01-1994      Modified function interface,     */
/*                                        resulting in version 1.1       */
/*      R. Pfaff -                                                       */
/*      D. Lamie        03-18-1994      Verified version 1.1             */
/*      M. Trippi       11-18-1996      Corrected SPR220.                */
/*                                                                       */
/*************************************************************************/
STATUS  DMF_Memory_Pool_Information(NU_MEMORY_POOL *pool_ptr, CHAR *name, 
                  VOID **start_address, UNSIGNED *pool_size, 
                  UNSIGNED *min_allocation, UNSIGNED *available, 
                  OPTION *suspend_type, UNSIGNED *tasks_waiting, 
                  NU_TASK **first_task)
{

DM_PCB         *pool;                       /* Pool control block ptr    */
INT             i;                          /* Working integer variable  */
STATUS          completion;                 /* Completion status         */


    /* Move input pool pointer into internal pointer.  */
    pool =  (DM_PCB *) pool_ptr;


#ifdef  NU_ENABLE_STACK_CHECK

    /* Call stack checking function to check for an overflow condition.  */
    TCT_Check_Stack();

#endif

    /* Determine if this memory pool id is valid.  */
    if ((pool != NU_NULL) && (pool -> dm_id == DM_DYNAMIC_ID))
    {
    
        /* Setup protection of the memory pool.  */
        TCT_Protect(&(pool -> dm_protect));

        /* The memory pool pointer is valid.  Reflect this in the completion
           status and fill in the actual information.  */
        completion =  NU_SUCCESS;
        
        /* Copy the memory pool's name.  */
        for (i = 0; i < NU_MAX_NAME; i++)
            *name++ =  pool -> dm_name[i];

        /* Determine the suspension type.  */
        if (pool -> dm_fifo_suspend)
            *suspend_type =          NU_FIFO;
        else
            *suspend_type =          NU_PRIORITY;
            
        /* Retrieve information directly out of the control structure.  */
        *start_address =        pool -> dm_start_address;
        *pool_size =            pool -> dm_pool_size;
        *min_allocation =       pool -> dm_min_allocation;
        *available =            pool -> dm_available;
        
        /* Retrieve the number of tasks waiting and the pointer to the 
           first task waiting.  */
        *tasks_waiting =  pool -> dm_tasks_waiting;
        if (pool -> dm_suspension_list)
    
            /* There is a task waiting.  */
            *first_task =  (NU_TASK *)
                (pool -> dm_suspension_list) -> dm_suspended_task;
        else
        
            /* There are no tasks waiting.  */
            *first_task =  NU_NULL;

        /* Release protection of the memory pool.  */
        TCT_Unprotect();
    }
    else
    
        /* Indicate that the memory pool pointer is invalid.   */
        completion =  NU_INVALID_POOL;

    /* Return the appropriate completion status.  */
    return(completion);
}