sk_defs.h

NecluesRTX RTOS的源码

/************************************************************************/
/*                                                                      */
/*              Copyright 1990 by Accelerated Technology                */
/*                                                                      */
/*  PROPRIETARY RIGHTS of Accelerated Technology are involved in the    */
/*  subject matter of this material.  All manufacturing, reproduction,  */
/*  use, and sales rights pertaining to this subject matter are         */
/*  governed by the license agreement.  The buyer or recipient of this  */
/*  package, implicitly accepts the terms of the license.               */
/*                                                                      */
/************************************************************************/

/************************************************************************/
/*                                                                      */
/*  FILE DESCRIPTION                                                    */
/*                                                                      */
/*  This file contains the description of the system Task Control       */
/*  Block (TCB).  Additional information may be required for certain    */
/*  target processor applications.                                      */
/*                                                                      */
/*  ROUTINES                                                            */
/*                                                                      */
/*      None                                                            */
/*                                                                      */
/*  NOTES                                                               */
/*                                                                      */
/*      None                                                            */
/*                                                                      */
/************************************************************************/


/* Define the value to check for stack memory overwrite problems.  If 
   this value is not in front of the stack, a subsequently created
   task's stack has overrun it.  */

#define   SK_STACK_PROTECT   0x1234


/* The structure "SK_TASK_CONTROL_BLOCK_STRUCT" defines the block of 
   information necessary to support the execution of a task.  In the 
   file "SKP.C" an array of these structures is allocated relative
   to the number of tasks specified in the file "IN_DATA.C."  */

struct SK_TASK_CONTROL_BLOCK_STRUCT 
{
    unsigned int             sk_task_id;    /* Task identification     */
    unsigned int             sk_priority;   /* Task priority           */
    unsigned int             sk_suspend;    /* Task suspension type    */
    unsigned int             sk_scheduled;  /* Task scheduled count    */
    unsigned int             sk_nu_1;       /* Notused                 */
    unsigned int             sk_nu_2;       /*                         */
    
    signed int               sk_no_preempt; /* No preemption count     */
    signed int               sk_time_slice; /* Time slice              */
    
    /* Basic setup parameters, including the original start of execution
       address.  */
    void                (*sk_task_addr) (); /* Original task address   */
    unsigned int             sk_stack_size; /* Task stack size in 
                                               unsigned words          */
    unsigned int             sk_stack_base; /* Base address of stack   */
    unsigned int            *sk_stack_fence;/* Fence to detect stack
                                               memory overwrite        */
    unsigned int             sk_stack_ptr;  /* Pointer into task stack */
    
    /* The following portion of this structure allows the TCB to be
       chained to the ready list.    */

    struct SK_TASK_CONTROL_BLOCK_STRUCT     *sk_ready_prev,
                                            *sk_ready_next;
};

/* Note that if changes are made to items above the next and previous TCB
   pointers, watch out for side-effects in SKD.?   */