glibc-2.10.1下有没有人能使用pthread_mutex_timedlock()这个函数？

/*
* compile: gcc example.c -lpthread -lrt
*/
#include <pthread.h>
#include <time.h>
#include <string.h>
#include <stdio.h>

pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
int main()
{
        struct timespec abs_time;
        pthread_mutex_lock(&lock);
        clock_gettime(CLOCK_REALTIME, &abs_time);
        abs_time.tv_sec += 2;
        int rc = pthread_mutex_timedlock (&lock, &abs_time);
        if (rc!=0) {
 printf("pthread_mutex_timedlock() returned: %s\n", strerror(rc));
        }
        return 0;
}