Hello all.
The issue is that I am trying to run a code which can trigger different timers at the same time. That is, when 3 is typed by the user, the firstimer is triggered. If before expiration another 3 is introduced, the second timer will be launched, and the difference between both triggers will be shown. Under this circumstance, timer_gettime only works once. I tried all the things I could imagine but still, it_value_tv_sec and _nsec return zero after the first expiration.
-Theoretically, and following the manuals, once the timer is restarted the gettime function should work as it does the first time.
-I have also tried to removed the timer and start it again, but in this case the timers are still being triggered, but the gettime outputs(even the first time) are nonsense.
Here is the code I am testing:
[CODE]#include<stdio.h>Code:#include<signal.h> #include<time.h> timer_t firstTimerID; timer_t secondTimerID; timer_t thirdTimerID; timer_t fourthTimerID; int z=0; int a=0; int t_block3=4; float delay_blocks; struct itimerspec it; struct itimerspec its; staticvoid timerHandler(int sig,siginfo_t*si,void*uc ) { timer_t*tidp; tidp = si->si_value.sival_ptr; if(*tidp == firstTimerID ){ printf("First timer\n"); } elseif(*tidp == secondTimerID ){ printf("Second timer\n"); } elseif(*tidp == thirdTimerID ){ printf("Third timer\n"); } elseif(*tidp == fourthTimerID ){ printf("Fourth timer\n"); } z--; printf("%d", z); } staticint makeTimer(timer_t*timerID,int time) { struct sigevent te; struct itimerspec its; struct sigaction sa; int sigNo = SIGRTMIN; // Set up signal handler. sa.sa_flags = SA_SIGINFO; sa.sa_sigaction = timerHandler;//Action when singal is triggered sigemptyset(&sa.sa_mask); if(sigaction(sigNo,&sa, NULL)==-1){ perror("sigaction"); } // Set and enable alarm te.sigev_notify = SIGEV_SIGNAL;//Gnerate alarm upon expiration te.sigev_signo = sigNo;//SIGALRM te.sigev_value.sival_ptr = timerID;//Timer ID //Create a per_process timer using the timer ID timer_create(CLOCK_REALTIME,&te, timerID); //Interval for starting again its.it_interval.tv_sec =0; its.it_interval.tv_nsec =0; //Timer time its.it_value.tv_sec = time; its.it_value.tv_nsec =0; //Arm/disarmer a per process time timer_settime(*timerID,0,&its, NULL); return1; } int main(){ while(1){ printf("Enter the number of the block\n"); if(scanf(" %d",&a)==1){ switch(a){ case3: printf("Block number three, belt will proceed to stop in 12 seconds\n"); if(z==0){ makeTimer(&firstTimerID, t_block3); }elseif(z==1){ makeTimer(&secondTimerID,4); timer_gettime(&firstTimerID,&it); delay_blocks=t_block3-(it.it_value.tv_sec+(it.it_value.tv_nsec*0.000000001)); printf("Difference between the first and the second timer = %f\n", delay_blocks); }elseif(z==2){ makeTimer(&thirdTimerID,4); }elseif(z==3){ makeTimer(&fourthTimerID,4); } z++; break; case2: printf("Block number two, belt will proceed to stop in 10 seconds\n"); //sleep(1); break; case4: printf("Block number four, belt won't stop\n"); //sleep(1); break; default:printf("Wrong lecture\n"); } } } }
Thank you in advance!
Originally Posted by landondonovan
