linux timer实现

#include <linux/timer.h>

struct timer_list my_timer;

void my_timer_callback(struct timer_list *timer) {
    // 定时器到期时执行的代码
}

void setup_timer(void) {
    init_timer(&my_timer);
    my_timer.function = my_timer_callback;
    my_timer.expires = jiffies + msecs_to_jiffies(1000); // 1秒后到期
    add_timer(&my_timer);
}

void stop_timer(void) {
    del_timer(&my_timer);
}

#include <sys/timerfd.h>
#include <unistd.h>
#include <stdio.h>

int main() {
    int tfd = timerfd_create(CLOCK_REALTIME, 0);
    if (tfd == -1) {
        perror("timerfd_create");
        return 1;
    }

    struct itimerspec its;
    its.it_value.tv_sec = 1; // 初始到期时间1秒
    its.it_value.tv_nsec = 0;
    its.it_interval.tv_sec = 1; // 周期性间隔1秒
    its.it_interval.tv_nsec = 0;

    if (timerfd_settime(tfd, 0, &its, NULL) == -1) {
        perror("timerfd_settime");
        close(tfd);
        return 1;
    }

    uint64_t expirations;
    read(tfd, &expirations, sizeof(expirations));
    printf("Timer expired %lu times\n", expirations);

    close(tfd);
    return 0;
}

#include <pthread.h>
#include <stdio.h>
#include <unistd.h>

void* timer_thread(void* arg) {
    sleep(1); // 延迟1秒
    printf("Timer expired\n");
    return NULL;
}

int main() {
    pthread_t thread;
    if (pthread_create(&thread, NULL, timer_thread, NULL) != 0) {
        perror("pthread_create");
        return 1;
    }
    pthread_join(thread, NULL);
    return 0;
}