μcosii源码试读3- OS_InitTCBList();任务控制块链表初始化及其功能(2)

yuyang911220

任务控制块是一个数据结构，其内容如下，这个结构在我理解相当于进程描述符的作用
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• /*
  
• *********************************************************************************************************
• * TASK CONTROL BLOCK
• *********************************************************************************************************
• */
• typedef struct os_tcb {
•     OS_STK *OSTCBStkPtr; /* Pointer to current top of stack */
• #if OS_TASK_CREATE_EXT_EN > 0
•     void *OSTCBExtPtr; /* Pointer to user definable data for TCB extension */
•     OS_STK *OSTCBStkBottom; /* Pointer to bottom of stack */
•     INT32U OSTCBStkSize; /* Size of task stack (in number of stack elements) */
•     INT16U OSTCBOpt; /* Task options as passed by OSTaskCreateExt() */
•     INT16U OSTCBId; /* Task ID (0..65535) */
• #endif
•     struct os_tcb *OSTCBNext; /* Pointer to next TCB in the TCB list */
•     struct os_tcb *OSTCBPrev; /* Pointer to previous TCB in the TCB list */
• #if OS_EVENT_EN
•     OS_EVENT *OSTCBEventPtr; /* Pointer to event control block */
• #endif
• #if ((OS_Q_EN > 0) && (OS_MAX_QS > 0)) || (OS_MBOX_EN > 0)
•     void *OSTCBMsg; /* Message received from OSMboxPost() or OSQPost() */
• #endif
• #if (OS_VERSION >= 251) && (OS_FLAG_EN > 0) && (OS_MAX_FLAGS > 0)
• #if OS_TASK_DEL_EN > 0