在使用纳米睡眠的c代码中利用小停顿的问题

#include <stdio.h>
#include <time.h>

void nanosleep_example(unsigned int nsec) {
    struct timespec req, rem;
    req.tv_sec = 0;
    req.tv_nsec = nsec;

    while (nanosleep(&req, &rem) == -1 && errno == EINTR) {
        req = rem;
    }
}

int main() {
    unsigned int nsec = 1000000; // 1 millisecond
    nanosleep_example(nsec);
    printf("Slept for %u nanoseconds\n", nsec);
    return 0;
}

#include <stdio.h>
#include <time.h>
#include <errno.h>

void nanosleep_example(unsigned int nsec) {
    struct timespec req, rem;
    req.tv_sec = 0;
    req.tv_nsec = nsec;

    while (nanosleep(&req, &rem) == -1) {
        if (errno == EINTR) {
            req = rem;
        } else {
            perror("nanosleep");
            break;
        }
    }
}

int main() {
    unsigned int nsec = 1000000; // 1 millisecond
    nanosleep_example(nsec);
    printf("Slept for %u nanoseconds\n", nsec);
    return 0;
}