相关疑难解决方法(0)

请考虑以下源代码,它完全符合POSIX:

#include <stdio.h>
#include <limits.h>
#include <stdint.h>
#include <stdlib.h>
#include <pthread.h>
#include <sys/time.h>

int main (int argc, char ** argv) {
    pthread_cond_t c;
    pthread_mutex_t m;
    char printTime[UCHAR_MAX];

    pthread_mutex_init(&m, NULL);
    pthread_cond_init(&c, NULL);

    for (;;) {
        struct tm * tm;
        struct timeval tv;
        struct timespec ts;

        gettimeofday(&tv, NULL);

        printf("sleep (%ld)\n", (long)tv.tv_sec);
        sleep(3);

        tm = gmtime(&tv.tv_sec);
        strftime(printTime, UCHAR_MAX, "%Y-%m-%d %H:%M:%S", tm);
        printf("%s (%ld)\n", printTime, (long)tv.tv_sec);

        ts.tv_sec = tv.tv_sec + 5;
        ts.tv_nsec = tv.tv_usec * 1000;

        pthread_mutex_lock(&m);
        pthread_cond_timedwait(&c, &m, &ts);
        pthread_mutex_unlock(&m);
    }
    return 0; …