0

我有这个规范：

任务 0 向任务 1 发送整数（从 1 开始）。任务 1 应将数字乘以 -1 并将它们发送回任务 0。然后任务 0 应将这些数字打印到控制台。对于任务 0 和任务 1 之间的通信，应使用单个内存位置 sharedAddress，即任务 0 和任务 1 都从该位置读取和写入！将文件另存为 SharedMemory.c。程序的执行应给出以下输出。发送：1 接收：-1 发送：2 接收：-2 ...

我编写了这个程序，但任务没有正确同步，我想我可能在信号量或上下文切换方面做错了。

我得到这个输出，而不是数字有时会倒计时，因为任务没有正确同步：

Receiving 17
Sending : 16
Receiving -16
Sending : -17
Receiving 17
Sending : 16
Receiving -16
Sending : -17
Receiving 17
Sending : 16
Receiving -16
Sending : -17
Receiving 17
Sending : 16
Receiving -16
Sending : -17
Receiving 17
Sending : 16
Receiving -16
Sending : -17
Receiving 17
Sending : 16
Receiving -16
Sending : -17
Receiving 17
Sending : 16
Receiving -16
Sending : -17
Receiving 17
Sending : 16
Receiving -16
Sending : -17
Receiving 17
Sending : 16
Receiving -16
Sending : -17
Receiving 17
Sending : 16
Receiving -16
Sending : -17
Receiving 17
Sending : 16
Receiving -16
Sending : -17
Receiving 17
Sending : 16
Receiving -16
Sending : -17
Receiving 17

我需要更改的程序是

#include <stdio.h>
#include "includes.h"
#include <string.h>

#define DEBUG 0

/* Definition of Task Stacks */
/* Stack grows from HIGH to LOW memory */
#define   TASK_STACKSIZE       2048
OS_STK    task1_stk[TASK_STACKSIZE];
OS_STK    task2_stk[TASK_STACKSIZE];
OS_STK    stat_stk[TASK_STACKSIZE];
OS_EVENT *aSemaphore;
/* Definition of Task Priorities */
#define TASK1_PRIORITY      6  // highest priority
#define TASK2_PRIORITY      7
#define TASK_STAT_PRIORITY 12  // lowest priority 
int number = 1;
void handle_button_interrupts(void* context, alt_u32 id) 
{ 
 volatile int* edge_capture_ptr = (volatile int*) context; 

 OSIntEnter(); 
 // Read the edge capture register on the button PIO 
 //*edge_capture_ptr = 
 //IORD_ALTERA_AVALON_PIO_EDGE_CAP(BUTTON_PIO_BASE); 

 OSIntExit(); 
} 


void printStackSize(INT8U prio)
{
    INT8U err;
    OS_STK_DATA stk_data;

    err = OSTaskStkChk(prio, &stk_data);
    if (err == OS_NO_ERR) 
    {
        if (DEBUG == 1)
           printf("Task Priority %d - Used: %d; Free: %d\n", 
                   prio, stk_data.OSFree, stk_data.OSUsed);
    }
    else
    {
        if (DEBUG == 1)
           printf("Stack Check Error!\n");    
    }
}

/* Producer */
void task1(void* pdata)
{
  INT8U err;

  while (1)
  { 
    char text1[] = "Sending : ";
    char text2[] = "Receiving : ";

    int i;
    OSSemPend(aSemaphore, 0, &err); // Trying to access the key

    for (i = 0; i < strlen(text1); i++)
        putchar(text1[i]);
    printf("%d", number); 
    putchar('\n');   


    OSSemPost(aSemaphore); // Releasing the key
    OSTimeDlyHMSM(0, 0, 0, 11); // Context Switch to next task

                               // Task will go to the ready state

                               // after the specified delay


    OSSemPend(aSemaphore, 0, &err); // Trying to access the key

    for (i = 0; i < strlen(text1); i++)
        putchar(text2[i]);
    printf("%d", number); 
    putchar('\n');   
    number=-number;
    number++; 
    OSSemPost(aSemaphore); // Releasing the key
    OSTimeDlyHMSM(0, 0, 0, 11); // Context Switch to next task

                               // Task will go to the ready state

                               // after the specified delay


  }
}

/* Consumer */
void task2(void* pdata)
{
  INT8U err;  
  while (1)
  { 
    OSSemPend(aSemaphore, 0, &err); // Trying to access the key
    number = -number;
    OSSemPost(aSemaphore); // Releasing the key
    OSTimeDlyHMSM(0, 0, 0, 4);
  }
}

/* Printing Statistics */
void statisticTask(void* pdata)
{
    while(1)
    {
        printStackSize(TASK1_PRIORITY);
        printStackSize(TASK2_PRIORITY);
        printStackSize(TASK_STAT_PRIORITY);
    }
}

/* The main function creates two task and starts multi-tasking */
int main(void)
{
  printf("Lab 3 - Handshake\n");
  aSemaphore = OSSemCreate(1); // binary semaphore (1 key)
  OSTaskCreateExt
    (task1,                        // Pointer to task code
     NULL,                         // Pointer to argument that is
                                   // passed to task
     &task1_stk[TASK_STACKSIZE-1], // Pointer to top of task stack
     TASK1_PRIORITY,               // Desired Task priority
     TASK1_PRIORITY,               // Task ID
     &task1_stk[0],                // Pointer to bottom of task stack
     TASK_STACKSIZE,               // Stacksize
     NULL,                         // Pointer to user supplied memory
                                   // (not needed here)
     OS_TASK_OPT_STK_CHK |         // Stack Checking enabled 
     OS_TASK_OPT_STK_CLR           // Stack Cleared                                 
    );

  OSTaskCreateExt
    (task2,                        // Pointer to task code
     NULL,                         // Pointer to argument that is
                                   // passed to task
     &task2_stk[TASK_STACKSIZE-1], // Pointer to top of task stack
     TASK2_PRIORITY,               // Desired Task priority
     TASK2_PRIORITY,               // Task ID
     &task2_stk[0],                // Pointer to bottom of task stack
     TASK_STACKSIZE,               // Stacksize
     NULL,                         // Pointer to user supplied memory
                                   // (not needed here)
     OS_TASK_OPT_STK_CHK |         // Stack Checking enabled 
     OS_TASK_OPT_STK_CLR           // Stack Cleared                       
    );  

  if (DEBUG == 1)
  {
    OSTaskCreateExt
      (statisticTask,                // Pointer to task code
       NULL,                         // Pointer to argument that is
                                     // passed to task
       &stat_stk[TASK_STACKSIZE-1],  // Pointer to top of task stack
       TASK_STAT_PRIORITY,           // Desired Task priority
       TASK_STAT_PRIORITY,           // Task ID
       &stat_stk[0],                 // Pointer to bottom of task stack
       TASK_STACKSIZE,               // Stacksize
       NULL,                         // Pointer to user supplied memory
                                     // (not needed here)
       OS_TASK_OPT_STK_CHK |         // Stack Checking enabled 
       OS_TASK_OPT_STK_CLR           // Stack Cleared                              
      );
  }  

  OSStart();
  return 0;
}

你能帮助我吗？

4

2 回答 2

2

再想一想：您可能需要两个信号量：

  • 一个用于从生产者发送到消费者（sem1）
  • 一种用于从消费者发送到生产者（sem2）

你用 0 初始化 sem1，用 1 初始化 sem2。

  • 任务 1 首先在 sem2 上执行挂起，然后在 sem1 上处理数据和发布。下一个循环步骤将等到 sem2 由 task2 发布。
  • 任务 2 在 sem 1 上挂起（因此等待第一个数据输入），处理数据并在 sem2 上发布
于 2013-10-14T10:59:46.910 回答
0 
#include <stdio.h>
#include "includes.h"
#include <string.h>

#define DEBUG 1

/* Definition of Task Stacks */
/* Stack grows from HIGH to LOW memory */
#define   TASK_STACKSIZE       2048
OS_STK    task1_stk[TASK_STACKSIZE];
OS_STK    task2_stk[TASK_STACKSIZE];
OS_STK    stat_stk[TASK_STACKSIZE];

/* Decaring the semaphone */
OS_EVENT *aSemaphore;
OS_EVENT *bSemaphore;
int number=0;

/* Definition of Task Priorities */
#define TASK1_PRIORITY      6  // highest priority
#define TASK2_PRIORITY      7
#define TASK_STAT_PRIORITY 12  // lowest priority 

void printStackSize(INT8U prio)
{
    INT8U err;
    OS_STK_DATA stk_data;

    err = OSTaskStkChk(prio, &stk_data);
    if (err == OS_NO_ERR) 
    {
        if (DEBUG == 1)
           printf("Task Priority %d - Used: %d; Free: %d\n", 
                   prio, stk_data.OSFree, stk_data.OSUsed);
    }
    else
    {
        if (DEBUG == 1)
           printf("Stack Check Error!\n");    
    }
}

/* Prints a message and sleeps for given time interval */
void task1(void* pdata)
{
  INT8U err_bSemaphore;

  while (1)
  { 

  OSSemPend(bSemaphore,0,&err_bSemaphore);
  number*= -1;
  number++;
  printf("Sending: %d\n",number);
  OSSemPost(aSemaphore);
  }
}

/* Prints a message and sleeps for given time interval */
void task2(void* pdata)
{
  INT8U err_aSemaphore;

  while (1)
  {     
    OSSemPend(aSemaphore,0, &err_aSemaphore);
    number*= -1;
    printf("Receiving: %d\n", number);
    OSSemPost(bSemaphore);
 }
}

/* Printing Statistics */
void statisticTask(void* pdata)
{
    while(1)
    {
        printStackSize(TASK1_PRIORITY);
        printStackSize(TASK2_PRIORITY);
        printStackSize(TASK_STAT_PRIORITY);
    }
}

/* The main function creates two task and starts multi-tasking */
int main(void)
{
  printf("Lab 1 - Two Tasks using Handshake (Task 2.4)\n");

/* Declaring a binary semaphore */
  aSemaphore = OSSemCreate(1);    
  bSemaphore = OSSemCreate(1);

  OSTaskCreateExt
    (task1,                        // Pointer to task code
     NULL,                         // Pointer to argument that is
                                   // passed to task
     &task1_stk[TASK_STACKSIZE-1], // Pointer to top of task stack
     TASK1_PRIORITY,               // Desired Task priority
     TASK1_PRIORITY,               // Task ID
     &task1_stk[0],                // Pointer to bottom of task stack
     TASK_STACKSIZE,               // Stacksize
     NULL,                         // Pointer to user supplied memory
                                   // (not needed here)
     OS_TASK_OPT_STK_CHK |         // Stack Checking enabled 
     OS_TASK_OPT_STK_CLR           // Stack Cleared                                 
    );

  OSTaskCreateExt
    (task2,                        // Pointer to task code
     NULL,                         // Pointer to argument that is
                                   // passed to task
     &task2_stk[TASK_STACKSIZE-1], // Pointer to top of task stack
     TASK2_PRIORITY,               // Desired Task priority
     TASK2_PRIORITY,               // Task ID
     &task2_stk[0],                // Pointer to bottom of task stack
     TASK_STACKSIZE,               // Stacksize
     NULL,                         // Pointer to user supplied memory
                                   // (not needed here)
     OS_TASK_OPT_STK_CHK |         // Stack Checking enabled 
     OS_TASK_OPT_STK_CLR           // Stack Cleared                       
    );  

  if (DEBUG == 1)
  {
    OSTaskCreateExt
      (statisticTask,                // Pointer to task code
       NULL,                         // Pointer to argument that is
                                     // passed to task
       &stat_stk[TASK_STACKSIZE-1],  // Pointer to top of task stack
       TASK_STAT_PRIORITY,           // Desired Task priority
       TASK_STAT_PRIORITY,           // Task ID
       &stat_stk[0],                 // Pointer to bottom of task stack
       TASK_STACKSIZE,               // Stacksize
       NULL,                         // Pointer to user supplied memory
                                     // (not needed here)
       OS_TASK_OPT_STK_CHK |         // Stack Checking enabled 
       OS_TASK_OPT_STK_CLR           // Stack Cleared                              
      );`enter code here`
  }  

  OSStart();
  return 0;
}
于 2015-10-10T12:15:59.220 回答