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04.27.2008 at 07:29PM PDT, ID: 23357674
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8.8

Create two different kind of timers by timer_create

Asked by TKD in Linux Programming

Tags:

In my program, I need two different kind of timers, periodic timer and one-shot timer. I write the code in Attach Code Snippet. I get the output
--------------------------------------
Periodic timer
Periodic timer
Periodic timer
Periodic timer
Periodic timer
Periodic timer
Periodic timer
Periodic timer
Periodic timer
Real-time signal 29
--------------------------------------
When the one-shot timer expires, it shows "Real-time signal 29" instead of "One-short timer". Why?
I can't create two different kind of timers in a program???Start Free Trial 
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#include <time.h>
#include <signal.h>
 
#define SIGTIMER     (SIGRTMAX)
#define ONESHOTTIMER (SIGRTMAX-1)
 
timer_t SetTimer(int signo, int sec, int mode);
void SignalHandler(int signo, siginfo_t * info, void *context);
timer_t timerid,oneshotTimer;
 
int main()
{
        struct sigaction sigact;
 
        sigemptyset(&sigact.sa_mask);
        sigact.sa_flags = SA_SIGINFO;
        sigact.sa_sigaction = SignalHandler;
 
        // Set up sigaction to catch signal
        if (sigaction(SIGTIMER, &sigact, NULL) == -1) {
                perror("sigaction failed");
                return -1;
        }
 
        // Establish a handler to catch CTRL+C and use it for exiting
        sigaction(SIGINT, &sigact, NULL);
 
        timerid = SetTimer(SIGTIMER, 1000, 1);
        oneshotTimer = SetTimer(ONESHOTTIMER, 10000, 0);
        for(;;)
           ;
        return 0;
}
timer_t SetTimer(int signo, int sec, int mode)
{
        struct sigevent sigev;
        timer_t timerid;
        struct itimerspec itval;
        struct itimerspec oitval;
 
        // Create the POSIX timer to generate signo
        sigev.sigev_notify = SIGEV_SIGNAL;
        sigev.sigev_signo = signo;
        sigev.sigev_value.sival_ptr = &timerid;
 
        if (timer_create(CLOCK_REALTIME, &sigev, &timerid) == 0) {
                itval.it_value.tv_sec = sec / 1000;
                itval.it_value.tv_nsec = (long)(sec % 1000) * (1000000L);
 
                if (mode == 1) {
                        itval.it_interval.tv_sec = itval.it_value.tv_sec;
                        itval.it_interval.tv_nsec = itval.it_value.tv_nsec;
                } else {
                        itval.it_interval.tv_sec = 0;
                        itval.it_interval.tv_nsec = 0;
                }
 
                if (timer_settime(timerid, 0, &itval, &oitval) != 0) {
                        perror("time_settime error!");
                }
        } else {
                perror("timer_create error!");
                return -1;
        }
        return timerid;
}
void SignalHandler(int signo, siginfo_t * info, void *context)
{
        if (signo == SIGTIMER) {
                puts("Periodic timer");
        }
        else if (signo == ONESHOTTIMER) {
                puts("One-short timer");
        }
        else if (signo == SIGINT) {
                timer_delete(oneshotTimer);
                timer_delete(timerid);
                perror("Ctrl + C cached!\n");
                exit(1);
        }
}
 
Keywords: Create two different kind of timers by ti…
Title
1 Counting down to a specified date/tim…
2 Forced install timer expired for schedul…
3 Countdown Timer
4 Timer/Count
5 Task/Timer system
6 Return focus to web page after timer e…
 
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[+][-]04.27.2008 at 08:17PM PDT, ID: 21451392

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[+][-]04.27.2008 at 10:28PM PDT, ID: 21451704

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[+][-]04.28.2008 at 01:54AM PDT, ID: 21452396

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[+][-]04.29.2008 at 10:22PM PDT, ID: 21468256

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[+][-]05.01.2008 at 11:26PM PDT, ID: 21484861

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[+][-]05.01.2008 at 11:28PM PDT, ID: 21484872

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[+][-]05.03.2008 at 08:00PM PDT, ID: 21494475

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About this solution

Zone: Linux Programming
Tags: C
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Solution Provided By: rendaduiyan
Participating Experts: 1
Solution Grade: A
 
 
 
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