C/C++常用接口:计时操作的函数 get_ms()

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接口定义: 

unsigned long long get_ms()
{
    struct timeval time_v = { 0 };
    gettimeofday(&time_v, NULL);
    return (unsigned long long)time_v.tv_sec * 1000 + time_v.tv_usec / 1000;
}

使用方法:

unsigned long long begin = get_ms();
......

unsigned long long end = get_ms();

printf("time coast:%llu.\n", end-begin);