vxWorks Timers：不能多次调用处理程序

Question

我正在使用定时器中断在VxWorks中进行简单测试，并使用fprintf将定时器触发的次数写入文件。但是问题在于计时器不会运行超过一次。

我用定时器间隔参数设置了定时器，如下所示。您认为出了什么问题？ 抱歉，这是一个琐碎的问题，但是我对vxWorks和Posix api还是陌生的，从某个时候开始，我无法解决此问题。

    #include "schdlr.h"
#define MILLION 1000000                 /* one million = 10^6*/
#define sec_to_nsec     1000000000      /* ns to s conversion = 10^9 */
#define MAX_ISR_READ 1000000    /* Numbers of sample to save -- 20170123
prova con 1000000 = ~50 minuti*/
#define timer_sec 0.00332               /* e.g. 0.04 seconds = 40 ms //// 0.00332
seconds = 3.332 ms*/
#define FILENAME "SchedLog.txt"
#define FLUSH_TIME 10.0
#define SIG_LLP_TIMER           SIGRTMIN
int     isr_idx;                        /* counter of ISR occurred -- starts from 0 and
increments at each interrupt*/

volatile float  clk_k,                          /* MY_CLOCK() value for the current sample*/
            clk_k_1;                        /* MY_CLOCK() value for the previous sample*/

/*clock and timer values*/
struct itimerspec custom_itimerspec;
timer_t timer_id;
clockid_t USED_CLK;
struct  timespec tv;
float a_n;


typedef struct TimeProbe
{
    float max_value;
    float min_value;
    float curr_value;
    float curr_mean;
    float curr_std;
    float prev_mean;
    float prev_std;
    unsigned int cnt;

} TimeProbe_t;


TimeProbe_t * ptp;
sem_t *sem;
const char* semName = "SCHEDULER_SEMAPHORE";




void init_timeProbe(TimeProbe_t* ptp)
{
    ptp->cnt = 0;
    ptp->curr_value = 0.0;
    ptp->curr_mean = ptp->curr_std = ptp->max_value = ptp->prev_mean =
ptp->prev_std = 0.0;
    ptp->min_value = 100000.0;
}




void init_data(TimeProbe_t* ptp)
{
    isr_idx = 0;
    USED_CLK = CLOCK_REALTIME;

    clk_k = 1000.f;
    clk_k_1 = 0.0;

    /*TimeProbe_t struct init*/
    init_timeProbe(ptp);
}

void fprintf_timeProbe(FILE* pfile, float clk, TimeProbe_t* ptp, int
flushRequestSent)
{
    fprintf(pfile,"hi");
}

void timer_ISR( int sig, siginfo_t *si, void *uc)
{
    isr_idx++;
}


void create_a_timer()
{
      int status;
      struct sigevent custom_sigevent;
      struct sigaction act;
      sigset_t mask;
      long long nanosecs = (long long)(timer_sec *sec_to_nsec);

      printf("Creating timer");


    sigemptyset(&act.sa_mask);
    act.sa_flags = SA_SIGINFO;
    act.sa_sigaction = timer_ISR;
    sigemptyset(&act.sa_mask);     

    if (sigaction(SIG_LLP_TIMER, &act, (struct sigaction *) NULL) == -1)
    {
            printf("sigaction fail\n");
    }


      custom_sigevent.sigev_notify = SIGEV_SIGNAL;
      custom_sigevent.sigev_value.sival_ptr = &timer_id;
      custom_sigevent.sigev_signo = SIG_LLP_TIMER;
      status = timer_create(USED_CLK, &custom_sigevent, &timer_id);
      if (status == -1)
        printf("ERROR Create timer");

      custom_itimerspec.it_value.tv_sec = 1;
      custom_itimerspec.it_value.tv_nsec = 0;
      custom_itimerspec.it_interval.tv_sec = 0;
      custom_itimerspec.it_interval.tv_nsec = 500*1000*1000;


      printf("settime starts\n");
      status = timer_settime(timer_id, 0, &custom_itimerspec, NULL);
      if (status == -1)
        printf("ERROR Set timer");

}





void* thread_schdl(void)
{
    FILE* pfile;
    int toBeFlushed = 0;
    float   current_flush_time, last_flush_time;
    timer_t timerid;

    /*file stuff fopen*/
    if((pfile = fopen(FILENAME,"w+"))==NULL)
    {
            printf("ERROR opening file. QUIT. \n", FILENAME);

    }
    else
            printf("OK opening file\n");


    fprintf(pfile,"Starting log of scheduling test on VxWorks OS\n");


    create_a_timer();


    sleep(10);

    timer_cancel(timer_id);


    fprintf(pfile,"Timer times %d \n",isr_idx);
    /*file stuff fclose at the end - without this close it doesnot get created!*/
    fclose(pfile);

    exit(OK);       

}



int main(void)
{

        struct sched_param      myParam;
    int toBeFlushed = 0;
    float   current_flush_time, last_flush_time;

    printf("Scheduler Test Starts on VxWorks OS for interval of 3.32ms \n");

    ptp = (TimeProbe_t*)malloc(sizeof(TimeProbe_t));
    sem = (sem_t*)malloc(sizeof(sem_t));

    init_data(ptp);                                 /*init data*/
    Task_Schdlr = taskSpawn ("Task_Schdlr", 187, VX_FP_TASK, STACK_SIZE_T,
                             (FUNCPTR) thread_schdl,0,0,0,0,0,0,0,0,0,0);

    if((Task_Schdlr == ERROR))
    {
            printf("taskSpawn failed\n");
    }
    else
    {
            myParam.sched_priority = 187;
            /*sched_setscheduler(Task_Schdlr, SCHED_FIFO, &myParam);*/
    }

    if ((SEM_schdlr = sem_open("SEM_schdlr", O_CREAT, 0, 0)) == (sem_t *) -1)
    {
            printf("taskSpawn sem_open\n");
    }

    system("clear");
    printf("ciao \n");

}