posixtimer.c

vxworks demo 有问题写信给我

/* posixTimer.c - posix timer demo */

/* Copyright 1984-1997 Wind River Systems, Inc. */

/*
modification history
--------------------
01a,07nov97,mm   added modification history and copyright
*/

/* includes */

#include "vxWorks.h"
#include "time.h"
#include "stdio.h"
#include "string.h"
#include "taskLib.h"
#include "semLib.h"
#include "msgQLib.h"
/* defines */

#define LONGTIME 362
#define  TIMER_MSG_QUEUE_LENGTH  20
timer_t timerId; 
SEM_ID   semSync;
MSG_Q_ID  timerQueueId;
struct timerMsg
{
    int  timerId;
};
struct itimerspec time_value;
/* function prototype */
void  setup();
void alarmHandle (timer_t ti, int arg);


void timerDemo()
{
   timerQueueId=msgQCreate(TIMER_MSG_QUEUE_LENGTH,sizeof(struct timerMsg),MSG_Q_FIFO);
   semSync = semBCreate (SEM_Q_FIFO, SEM_EMPTY);      
   /* Spawn the demoTask */
   if (taskSpawn ("tPosicTimerTask",120, 0, 4096, (FUNCPTR)setup,
                   0, 0, 0, 0, 0, 0, 0, 0, 0, 0) == ERROR)
   {
          printf("posixTimerStartDemo: Error in spawning demoTask");
   } 
  
}

void alarmHandle (timer_t ti, int arg)
{
   struct timerMsg   msgItem;
   msgItem.timerId=1;
   msgQSend(timerQueueId,(char *)&msgItem,sizeof(struct timerMsg),
            WAIT_FOREVER,MSG_PRI_NORMAL); 
}

void setup()
{
   int i;
   struct timerMsg  msg_item;
   /* create a new timer and put its id in timerId 
    */
    printf("hahahahh\n");
    timer_create (CLOCK_REALTIME, NULL, &timerId);

   /* When the timer goes off we want to call alarmHandle 
    */
    timer_connect (timerId,(VOIDFUNCPTR) alarmHandle,0);
   /* initialise time-value */
    bzero ((char *) &time_value, sizeof (struct itimerspec));
   
    /* Timer goes off after .5 secs */
    time_value.it_value.tv_sec =1; 
    for(i=0;i<1000000;i++)
    {
       /* arm timer */
       timer_settime(timerId, 0, &time_value, NULL);
      if(msgQReceive(timerQueueId,(char *)&msg_item,sizeof(struct timerMsg),
                 WAIT_FOREVER))
      {
        if(msg_item.timerId==1)
        {     
          printf ("Task woken up by alarm!\n");
        }
       /* 
        * When the timer goes off it sends a signal to the task that armed it.
        * The signal handler alarmHandle will be called in the context of this task.
        * As a result of the signal taskDelay will return with ERROR 
        */   
        if(!(i%4))
        {
           printf("Cancel the timer!\n");      
           timer_cancel (timerId);
        }
      }
      else
      {
         printf("hello\n");        
      }
   }
  /* Clean up any resources used by the timer */
  /* timer_delete (timerId);*/
}