Does handling signals make the application close in anyway? my goal is to do some action when time run out but get stuck in the loop, until the user enter q or EOF is found but for some reason as soon the singal is received, the application seem to not execute the loop at all just print printf("returning from main!!\n"); and exit from the application. What am I misisng? how do i fix that?
here's the full code:
#include <signal.h>#include <sys/time.h>#include <stdio.h>#include <stdlib.h>#include <stddef.h>#include <ucontext.h>#include <unistd.h>void thread_signal_handler(int signal){ // Thread's time slice has run out, switch to another thread // ... printf("time run out!!!\n");}int main(){ // Set up the signal handler for the thread's time slice struct sigaction sa; sa.sa_handler = thread_signal_handler; sigemptyset(&sa.sa_mask); sa.sa_flags = 0; sigaction(SIGALRM, &sa, NULL); // Set up the timer for the thread's time slice struct itimerval timer; timer.it_value.tv_sec = 5; timer.it_value.tv_usec = 0; timer.it_interval.tv_sec = 0; timer.it_interval.tv_usec = 0; setitimer(ITIMER_REAL, &timer, NULL); while (1) { int ch = getchar(); if(ch == 'q' || ch == EOF) break; } printf("returning from main!!\n"); return 0;}
