📄 quc.c
字号:
/*************************************************************************/
/* */
/* Copyright Mentor Graphics Corporation 2004 */
/* All Rights Reserved. */
/* */
/* THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION WHICH IS */
/* THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS AND IS */
/* SUBJECT TO LICENSE TERMS. */
/* */
/*************************************************************************/
/*************************************************************************/
/* */
/* FILE NAME VERSION */
/* */
/* quc.c Nucleus PLUS 1.15 */
/* */
/* COMPONENT */
/* */
/* QU - Queue Management */
/* */
/* DESCRIPTION */
/* */
/* This file contains the core routines for the Queue management */
/* component. */
/* */
/* DATA STRUCTURES */
/* */
/* None */
/* */
/* FUNCTIONS */
/* */
/* QUC_Create_Queue Create a message queue */
/* QUC_Delete_Queue Delete a message queue */
/* QUC_Send_To_Queue Send message to a queue */
/* QUC_Receive_From_Queue Receive a message from queue */
/* QUC_Cleanup Cleanup on timeout or a */
/* terminate condition */
/* */
/* DEPENDENCIES */
/* */
/* cs_extr.h Common Service functions */
/* tc_extr.h Thread Control functions */
/* qu_extr.h Queue functions */
/* hi_extr.h History functions */
/* */
/*************************************************************************/
#define NU_SOURCE_FILE
#include "plus/inc/cs_extr.h" /* Common service functions */
#include "plus/inc/tc_extr.h" /* Thread control functions */
#include "plus/inc/qu_extr.h" /* Queue functions */
#include "plus/inc/hi_extr.h" /* History functions */
/* Define external inner-component global data references. */
extern CS_NODE *QUD_Created_Queues_List;
extern UNSIGNED QUD_Total_Queues;
extern TC_PROTECT QUD_List_Protect;
/* Define internal component function prototypes. */
VOID QUC_Cleanup(VOID *information);
/*************************************************************************/
/* */
/* FUNCTION */
/* */
/* QUC_Create_Queue */
/* */
/* DESCRIPTION */
/* */
/* This function creates a queue and then places it on the list */
/* of created queues. */
/* */
/* CALLED BY */
/* */
/* Application */
/* QUCE_Create_Queue Error checking shell */
/* */
/* CALLS */
/* */
/* CSC_Place_On_List Add node to linked-list */
/* [HIC_Make_History_Entry] Make entry in history log */
/* [TCT_Check_Stack] Stack checking function */
/* TCT_Protect Protect created list */
/* TCT_Unprotect Un-protect data structure */
/* */
/* INPUTS */
/* */
/* queue_ptr Queue control block pointer */
/* name Queue name */
/* start_address Starting address of actual */
/* queue area */
/* queue_size Total size of queue */
/* message_type Type of message supported by */
/* the queue (fixed/variable) */
/* message_size Size of message. Variable */
/* message-length queues, this*/
/* represents the maximum size*/
/* suspend_type Suspension type */
/* */
/* OUTPUTS */
/* */
/* NU_SUCCESS */
/* */
/*************************************************************************/
STATUS QUC_Create_Queue(NU_QUEUE *queue_ptr, CHAR *name,
VOID *start_address, UNSIGNED queue_size,
OPTION message_type, UNSIGNED message_size,
OPTION suspend_type)
{
R1 QU_QCB *queue; /* Queue control block ptr */
INT i; /* Working index variable */
NU_SUPERV_USER_VARIABLES
/* Switch to supervisor mode */
NU_SUPERVISOR_MODE();
/* Move input queue pointer into internal pointer. */
queue = (QU_QCB *) queue_ptr;
#ifdef NU_ENABLE_STACK_CHECK
/* Call stack checking function to check for an overflow condition. */
TCT_Check_Stack();
#endif
#ifdef NU_ENABLE_HISTORY
/* Make an entry that corresponds to this function in the system history
log. */
HIC_Make_History_Entry(NU_CREATE_QUEUE_ID, (UNSIGNED) queue,
(UNSIGNED) name, (UNSIGNED) start_address);
#endif
/* First, clear the queue ID just in case it is an old Queue
Control Block. */
queue -> qu_id = 0;
/* Fill in the queue name. */
for (i = 0; i < NU_MAX_NAME; i++)
queue -> qu_name[i] = name[i];
/* Setup the queue suspension type. */
if (suspend_type == NU_FIFO)
/* FIFO suspension is selected, setup the flag accordingly. */
queue -> qu_fifo_suspend = NU_TRUE;
else
/* Priority suspension is selected. */
queue -> qu_fifo_suspend = NU_FALSE;
/* Setup the queue message type. */
if (message_type == NU_FIXED_SIZE)
/* Fixed-size messages are required. */
queue -> qu_fixed_size = NU_TRUE;
else
/* Variable-size messages are required. */
queue -> qu_fixed_size = NU_FALSE;
/* Setup the message size. */
queue -> qu_message_size = message_size;
/* Clear the messages counter. */
queue -> qu_messages = 0;
/* Setup the actual queue parameters. */
queue -> qu_queue_size = queue_size;
/* If the queue supports fixed-size messages, make sure that the queue
size is an even multiple of the message size. */
if (queue -> qu_fixed_size)
/* Adjust the area of the queue being used. */
queue_size = (queue_size / message_size) * message_size;
queue -> qu_available = queue_size;
queue -> qu_start = (UNSIGNED *) start_address;
queue -> qu_end = queue -> qu_start + queue_size;
queue -> qu_read = (UNSIGNED *) start_address;
queue -> qu_write = (UNSIGNED *) start_address;
/* Clear the suspension list pointer. */
queue -> qu_suspension_list = NU_NULL;
/* Clear the number of tasks waiting on the queue counter. */
queue -> qu_tasks_waiting = 0;
/* Clear the urgent message list pointer. */
queue -> qu_urgent_list = NU_NULL;
/* Initialize link pointers. */
queue -> qu_created.cs_previous = NU_NULL;
queue -> qu_created.cs_next = NU_NULL;
/* Protect against access to the list of created queues. */
TCT_Protect(&QUD_List_Protect);
/* At this point the queue is completely built. The ID can now be
set and it can be linked into the created queue list. */
queue -> qu_id = QU_QUEUE_ID;
/* Link the queue into the list of created queues and increment the
total number of queues in the system. */
CSC_Place_On_List(&QUD_Created_Queues_List, &(queue -> qu_created));
QUD_Total_Queues++;
#ifdef NU_PROFILE_PLUS
PRF_PLUS_QUC_CREATE_QUEUE_0
#endif /* NU_PROFILE_PLUS */
/* Release protection against access to the list of created queues. */
TCT_Unprotect();
/* Return to user mode */
NU_USER_MODE();
/* Return successful completion. */
return(NU_SUCCESS);
}
/*************************************************************************/
/* */
/* FUNCTION */
/* */
/* QUC_Delete_Queue */
/* */
/* DESCRIPTION */
/* */
/* This function deletes a queue and removes it from the list of */
/* created queues. All tasks suspended on the queue are */
/* resumed. Note that this function does not free the memory */
/* associated with the queue. */
/* */
/* CALLED BY */
/* */
/* Application */
/* QUCE_Delete_Queue Error checking shell */
/* */
/* CALLS */
/* */
/* CSC_Remove_From_List Remove node from list */
/* [HIC_Make_History_Entry] Make entry in history log */
/* TCC_Resume_Task Resume a suspended task */
/* [TCT_Check_Stack] Stack checking function */
/* TCT_Control_To_System Transfer control to system */
/* TCT_Protect Protect created list */
/* TCT_Set_Current_Protect Setup current protect pointer*/
/* TCT_System_Protect Protect against system access*/
/* TCT_System_Unprotect Release system protection */
/* TCT_Unprotect Release protection */
/* */
/* INPUTS */
/* */
/* queue_ptr Queue control block pointer */
/* */
/* OUTPUTS */
/* */
/* NU_SUCCESS */
/* */
/*************************************************************************/
STATUS QUC_Delete_Queue(NU_QUEUE *queue_ptr)
{
R1 QU_QCB *queue; /* Queue control block ptr */
QU_SUSPEND *suspend_ptr; /* Suspend block pointer */
QU_SUSPEND *next_ptr; /* Next suspend block pointer*/
STATUS preempt; /* Status for resume call */
NU_SUPERV_USER_VARIABLES
/* Move input queue pointer into internal pointer. */
queue = (QU_QCB *) queue_ptr;
/* Switch to supervisor mode */
NU_SUPERVISOR_MODE();
#ifdef NU_ENABLE_STACK_CHECK
/* Call stack checking function to check for an overflow condition. */
TCT_Check_Stack();
#endif
#ifdef NU_ENABLE_HISTORY
/* Make an entry that corresponds to this function in the system history
log. */
HIC_Make_History_Entry(NU_DELETE_QUEUE_ID, (UNSIGNED) queue,
(UNSIGNED) 0, (UNSIGNED) 0);
#endif
/* Protect against access to the queue. */
TCT_System_Protect();
#ifdef NU_PROFILE_PLUS
PRF_PLUS_QUC_DELETE_QUEUE_0
#endif /* NU_PROFILE_PLUS */
/* Clear the queue ID. */
queue -> qu_id = 0;
/* Release protection. */
TCT_Unprotect();
/* Protect against access to the list of created queues. */
TCT_Protect(&QUD_List_Protect);
/* Remove the queue from the list of created queues. */
CSC_Remove_From_List(&QUD_Created_Queues_List, &(queue -> qu_created));
/* Decrement the total number of created queues. */
QUD_Total_Queues--;
/* Pickup the suspended task pointer list. */
suspend_ptr = queue -> qu_suspension_list;
/* Walk the chain task(s) currently suspended on the queue. */
preempt = 0;
while (suspend_ptr)
{
/* Protect against system access. */
TCT_System_Protect();
/* Resume the suspended task. Insure that the status returned is
NU_QUEUE_DELETED. */
suspend_ptr -> qu_return_status = NU_QUEUE_DELETED;
/* Point to the next suspend structure in the link. */
next_ptr = (QU_SUSPEND *) (suspend_ptr -> qu_suspend_link.cs_next);
/* Resume the specified task. */
preempt = preempt |
TCC_Resume_Task((NU_TASK *) suspend_ptr -> qu_suspended_task,
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -