tcd.c

基于nucleus操作系统的GPRS无线数据传输终端全套源文件。包括支持ARM7的BSP,操作系统

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/* TCD_Highest_Priority contains the highest priority task ready for execution.
   Note that this does not necessarily represent the priority of the currently 
   executing task.  This is true if the currently executing task has preemption
   disabled.  If no tasks are executing, this variable is set to the maximum
   priority.  */

INT             TCD_Highest_Priority;


/* TCD_Execute_Task is a pointer to the task to execute.  Note that this 
   pointer does not necessarily point to the currently executing task.  There
   are several points in the system where this is true.  One situation is 
   when preemption is about to take place.  Another situation can result from
   a internal protection conflict.  */
   
TC_TCB         *TCD_Execute_Task;


/* TCD_Created_HISRs_List is the head pointer of the list of created High-
   Level Interrupt Service Routines (HISR).  If this pointer is NU_NULL, there
   are no HISRs currently created.  */
   
CS_NODE        *TCD_Created_HISRs_List;


/* TCD_Total_HISRs contains the number of currently created HISRs.  */

UNSIGNED        TCD_Total_HISRs;


/* TCD_Active_HISR_Heads is an array of active HISR list head pointers.  
   There are three HISR priorities available.  The HISR priority is an index 
   into this table.  Priority/index 0 represents the highest priority.  */
   
TC_HCB         *TCD_Active_HISR_Heads[TC_HISR_PRIORITIES];


/* TCD_Active_HISR_Tails is an array of active HISR list tail pointers.  
   There are three HISR priorities available.  The HISR priority is an index 
   into this table.  Priority/index 0 represents the highest priority.  */
   
TC_HCB          *TCD_Active_HISR_Tails[TC_HISR_PRIORITIES];


/* TCD_Execute_HISR contains a pointer to the highest priority HISR to execute.
   If this pointer is NU_NULL, no HISRs are currently activated.  Note that
   the current thread pointer is not always equal to this pointer.  */
   
TC_HCB         *TCD_Execute_HISR;


/* TCD_Current_Thread points to the control block of the currently executing
   thread of execution.  Therefore, this variable points at either a TC_TCB
   or a TC_HCB structure.  Except for initialization, this variable is set
   and cleared in the target dependent portion of this component.  */
   
VOID           *TCD_Current_Thread;


/* TCD_System_Stack contains the system stack base pointer.  When the system
   is idle or in interrupt processing the system stack pointer is used.  This
   variable is usually setup during target dependent initialization.  */
   
VOID           *TCD_System_Stack;


/* TCD_Registered_LISRs is a list that specifies whether or not a
   LISR is registered for a given interrupt vector.  If the value in the
   list indexed by the vector is non-zero, then that value can be used
   as the index into the list of LISR pointers to find the actual registered
   LISR.  */
   
UNSIGNED_CHAR   TCD_Registered_LISRs[NU_MAX_VECTORS];


/* TCD_LISR_Pointers is a list of LISR pointers that indicate the LISR function
   to call when the interrupt occurs.  If the entry is NULL, it is 
   available.  */

VOID    (*TCD_LISR_Pointers[NU_MAX_LISRS])(INT vector);


/* TCD_Interrupt_Count contains the number of Interrupt Service Routines (ISRs)
   currently in progress.  If the contents of this variable is zero, then no
   interrupts are in progress.  If the contents are greater than 1, nested 
   interrupts are being processed.  */
   
INT     TCD_Interrupt_Count;


/* TCD_Stack_Switched contains a flag indicating that the system stack was
   switched to after the thread's context was saved.  This variable is not
   used in all ports.  */
   
INT     TCD_Stack_Switched;


/* TCD_List_Protect is a structure that is used to protect against multiple
   access to the list of established tasks.  */
   
TC_PROTECT      TCD_List_Protect;


/* TCD_System_Protect is a structure that is used to provide protection
   against multiple threads accessing the same system structures at the
   same time.  */
   
TC_PROTECT      TCD_System_Protect;


/* TCD_LISR_Protect is a structure that is used to provide protection against
   multiple threads accessing the LISR registration structures at the same
   time.  */
   
TC_PROTECT      TCD_LISR_Protect;


/* TCD_HISR_Protect is a structure that is used to provide protection against
   multiple threads accessing the created HISR linked-list at the same time. */
   
TC_PROTECT      TCD_HISR_Protect;


/* TCD_Interrupt_Level is a variable that contains the enabled interrupt 
   level.  If the target processor does not have multiple enable interrupt
   levels, this variable is a boolean.  */
   
INT             TCD_Interrupt_Level;


/* TCD_Unhandled_Interrupt is a variable that contains the last unhandled
   interrupt in system error conditions.  */
   
INT             TCD_Unhandled_Interrupt;