TCB是什么？看到描写他的数据结构是WIND_TCB ，具体是怎样的类型呢？获得TCB能对task进行什么操作呢？
------解决方案--------------------------------------------------------
对于信号量的部分通常是通过在TCB中确定它挂接在那个阻塞队列的队列头来体现
------解决方案--------------------------------------------------------
TCB是任务控制块，相当于每个任务的信息都保存在这个结构中，这样在任务切换时，这个任务的信息就可以保存在任务上下文中。
有些操作（如taskInit）需要TCB地址做参数，参看手册。
需要TCB地址时可以通过taskTcb从taskID获取TCB地址，参看手册。
WIND_TCB的具体数据结构定义在taskLib.h中有定义，是：
typedef struct windTcb /* WIND_TCB - task control block */
{
Q_NODE qNode; /* 0x00: multiway q node: rdy/pend q */
Q_NODE tickNode; /* 0x10: multiway q node: tick q */
Q_NODE activeNode; /* 0x20: multiway q node: active q */
OBJ_CORE objCore; /* 0x30: object management */
char * name; /* 0x34: pointer to task name */
int options; /* 0x38: task option bits */
UINT status; /* 0x3c: status of task */
UINT priority; /* 0x40: task's current priority */
UINT priNormal; /* 0x44: task's normal priority */
UINT priMutexCnt; /* 0x48: nested priority mutex owned */
struct semaphore * pPriMutex; /* 0x4c: pointer to inheritance mutex */
UINT lockCnt; /* 0x50: preemption lock count */
UINT tslice; /* 0x54: current count of time slice */
UINT16 swapInMask; /* 0x58: task's switch in hooks */
UINT16 swapOutMask; /* 0x5a: task's switch out hooks */
Q_HEAD * pPendQ; /* 0x5c: q head pended on (if any) */
UINT safeCnt; /* 0x60: safe-from-delete count */
Q_HEAD safetyQHead; /* 0x64: safe-from-delete q head */
FUNCPTR entry; /* 0x74: entry point of task */
char * pStackBase; /* 0x78: points to bottom of stack */
char * pStackLimit; /* 0x7c: points to stack limit */
char * pStackEnd; /* 0x80: points to init stack limit */
int errorStatus; /* 0x84: most recent task error */
int exitCode; /* 0x88: error passed to exit () */
struct sigtcb * pSignalInfo; /* 0x8c: ptr to signal info for task */
struct selContext * pSelectContext; /* 0x90: ptr to select info for task */
UINT taskTicks; /* 0x94: total number of ticks */
UINT taskIncTicks; /* 0x98: number of ticks in slice */
struct taskVar * pTaskVar; /* 0x9c: ptr to task variable list */