POSIX定时器 – 有多个定时器

我想在两个不同的目的在我的系统中有两个计时器，但我不明白为什么它不工作。 有人可以帮我吗？另外，处理程序代码应该是最less的，所以任务本身不会干扰tick。 我也可以定义单独的处理程序？

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <signal.h> #include <netinet/in.h> #include <linux/socket.h> #include <time.h> #define SIGTIMER (SIGRTMAX) #define SIG SIGUSR1 static timer_t tid; static timer_t tid2; void SignalHandler(int,siginfo_t*,void* ); timer_t SetTimer(int,int,int); int main(int argc,char *argv[]) { 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"); exit( EXIT_FAILURE ); } // Establish a handler to catch CTRL+c and use it for exiting. sigaction(SIGINT,NULL); tid=SetTimer(SIGTIMER,1000,1); struct sigaction sa; sigemptyset(&sa.sa_mask); sa.sa_flags = SA_SIGINFO; sa.sa_sigaction = SignalHandler; // set up sigaction to catch signal if (sigaction(SIG,&sa,NULL) == -1) { perror("sa failed"); exit( EXIT_FAILURE ); } // Establish a handler to catch CTRL+c and use it for exiting. sigaction(SIGINT,NULL); tid2=SetTimer(SIG,3); for(;;); return 0; } void SignalHandler(int signo,siginfo_t* info,void* context) { if (signo == SIGTIMER) { printf("Command Caller has tickedn"); }else if (signo == SIG) { printf("Data Caller has tickedn"); } else if (signo == SIGINT) { timer_delete(tid); perror("Crtl+c cached!"); exit(1); // exit if CRTL/C is issued } } timer_t SetTimer(int signo,int sec,int mode) { static struct sigevent sigev; static timer_t tid; static struct itimerspec itval; static struct itimerspec oitval; // Create the POSIX timer to generate signo sigev.sigev_notify = SIGEV_SIGNAL; sigev.sigev_signo = signo; sigev.sigev_value.sival_ptr = &tid; if (timer_create(CLOCK_REALTIME,&sigev,&tid) == 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(tid,&itval,&oitval) != 0) { perror("time_settime error!"); } } else { perror("timer_create error!"); return NULL; } return tid; }

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当你使用这个tid2=SetTimer(SIG,3);定义你的第二个定时器时tid2=SetTimer(SIG,3); ，你的代码将这个定时器配置成一个单次定时器

if (mode == 1) { itval.it_interval.tv_sec = itval.it_value.tv_sec; // here you arm the timer periodically (that's the meaning of it_interval itval.it_interval.tv_nsec = itval.it_value.tv_nsec; } else { itval.it_interval.tv_sec = 0; // here you arm the timer once itval.it_interval.tv_nsec = 0; }

如果使用mode = 1配置第二个定时器，例如tid2=SetTimer(SIG,4); ，你会在你的控制台上获得这个：

Command Caller has ticked Data Caller has ticked Command Caller has ticked Data Caller has ticked Command Caller has ticked Data Caller has ticked ^CCrtl+c cached!: Success

你可以为你的计时器使用不同的处理程序，因为你正在使用不同的信号来达到它的到期时间。