Linux under Setitimer Timer and timer cancellation __linux

#include <stdio.h> #include <signal.h> #include <time.h> #include <string.h> #include <
    stdlib.h> #include <unistd.h> void Timer_thread (Union Sigval v) {static int i = 0; printf ("Timer_thread function!
    %d\n ", v.sival_int);
printf ("i =%d\n", ++i);  
    int main () {timer_t timerid;  
    struct Sigevent EVP;       memset (&AMP;EVP, 0, sizeof (struct sigevent));                0 Initialize evp.sigev_value.sival_int = 111;                is also the identification timer, the callback function can obtain evp.sigev_notify = Sigev_thread;       The way the thread is notified, a new thread is posted evp.sigev_notify_function = Timer_thread; Thread function Address if (timer_create (Clock_realtime, &AMP;EVP, &timerid) = = 1) {perror ("fail to Timer_c  
        Reate ");  
    Exit (-1); /* The first interval it.it_value so long, after each time is it.it_interval so long, that is it.it_value when 0 will load it.it_interval value * * struct ITIMERSPEC I  
    T  
    It.it_interval.tv_sec = 2;  
 it.it_interval.tv_nsec = 0;   It.it_value.tv_sec = 3;  

    it.it_value.tv_nsec = 0;
        if (Timer_settime (Timerid, 0, &it, NULL) = = 1) {perror ("fail to Timer_settime");
    Exit (-1);
    }//pause ();

    while (1);
return 0; 
 /* * int timer_gettime (timer_t timerid, struct itimerspec *curr_value);
                   * Get the value of the timer specified by Timerid, and fill in curr_value * *

Compile need add:-LRT

Output results:

(Countdown 3 seconds)

Timer_thread function! 111
i = 1
(2s per)
Timer_thread function! 111

i = 2
(2s per)
Timer_thread function! 111
i = 3
(2s per)
Timer_thread function! 111
i = 4



Linux to cancel the timer set with Setitimer
Setitimer set It_interval and It_value to zero:

void Uninit_time ()  
{  
    struct itimerval value;  
    value.it_value.tv_sec = 0;  
    value.it_value.tv_usec = 0;  
    Value.it_interval = Value.it_value;  
    Setitimer (Itimer_real, &value, NULL);  
}