How use pthread_cond_timedwait without clock_gettime?

Applications Programming
1

I need to use pthread_cond_timedwait, which is available in my old embedded Linux for PPC. But I don't have clock_gettime... So, I build this replacement for clock_gettime, and it seems to work:

#include <sys/time.h>
#include <time.h>

int clock_gettime_replacement(struct timespec *now) {
#ifdef HAVE_CLOCK_GETTIME
    return clock_gettime(CLOCK_REALTIME, now);
#else
    now->tv_sec = time(NULL);
    struct timeval tv;
    gettimeofday(&tv, NULL);
    now->tv_nsec = tv.tv_usec * 1000;
    return 0;
#endif
}

But I'm afraid of issues related with daylight saving and timezone. Do you know where I can get sources of clock_gettime, so I can build it on my own using other system calls?

2

Do a web search for "clock_gettime.c" and you will find source code for a number of implementations.