网站用图要怎么做,做电影网站需要多大空间,网站经营内容,网站动态图怎么做在 Linux C 应用编程中#xff0c;对于多线程编程中的定时器函数使用#xff0c;通常可以借助 pthread 库和系统提供的定时器相关的函数来实现。
首先#xff0c;常见的定时器函数有 setitimer() 和 alarm() 。setitimer() 函数可以更精确地设置定时器#xff0c;它可以设…在 Linux C 应用编程中对于多线程编程中的定时器函数使用通常可以借助 pthread 库和系统提供的定时器相关的函数来实现。
首先常见的定时器函数有 setitimer() 和 alarm() 。setitimer() 函数可以更精确地设置定时器它可以设置为 ITIMER_REAL以实时时间递减、ITIMER_VIRTUAL以进程在用户态执行的时间递减和 ITIMER_PROF以进程在用户态和内核态执行的时间递减三种模式。 #include stdio.h
#include stdlib.h
#include pthread.h
#include unistd.h
#include signal.h
#include time.h#define TIMER_INTERVAL_SEC 2void timer_handler(union sigval sv)
{printf(Timer expired. Thread ID: %ld\n, pthread_self());
}void* thread_function(void* arg)
{timer_t timer_id;struct sigevent sev;sev.sigev_notify SIGEV_THREAD;sev.sigev_notify_function timer_handler;sev.sigev_value.sival_ptr timer_id;timer_create(CLOCK_REALTIME, sev, timer_id);struct itimerspec its;its.it_interval.tv_sec TIMER_INTERVAL_SEC;its.it_interval.tv_nsec 0;its.it_value.tv_sec 1;its.it_value.tv_nsec 0;timer_settime(timer_id, 0, its, NULL);while (1) {sleep(1);}timer_delete(timer_id);pthread_exit(NULL);
}int main()
{pthread_t thread_id1, thread_id2;pthread_create(thread_id1, NULL, thread_function, NULL);pthread_create(thread_id2, NULL, thread_function, NULL);pthread_join(thread_id1, NULL);pthread_join(thread_id2, NULL);return 0;
}
#include stdio.h
#include time.h
#include signal.h
#include unistd.h
#include stdlib.h#define TIMER_SIG SIGRTMINvoid timer_handler(int sig, siginfo_t *si, void *uc) {// 定时器到期时被调用的处理函数printf(Timer fired!\n);
}int main() {timer_t timerid;struct sigevent sev;struct itimerspec its;struct sigaction sa;// 设置处理函数sa.sa_flags SA_SIGINFO;sa.sa_sigaction timer_handler;sigemptyset(sa.sa_mask);if (sigaction(TIMER_SIG, sa, NULL) -1) {perror(sigaction);exit(1);}// 创建定时器sev.sigev_notify SIGEV_SIGNAL;sev.sigev_signo TIMER_SIG;sev.sigev_value.sival_ptr timerid;if (timer_create(CLOCK_REALTIME, sev, timerid) -1) {perror(timer_create);exit(1);}// 启动定时器its.it_value.tv_sec 2; // 初次到期时间2秒后its.it_value.tv_nsec 0;its.it_interval.tv_sec 1; // 定时器周期每隔1秒its.it_interval.tv_nsec 0;if (timer_settime(timerid, 0, its, NULL) -1) {perror(timer_settime);exit(1);}sleep(10); // 等待定时器触发几次return 0;
}
