linux 用时统计

用于记录便于使用时复制

#include
#include
static void tv_sub(struct timeval *out, struct timeval *in)
{
    if ( (out->tv_usec -= in->tv_usec) < 0){
        --out->tv_sec;
        out->tv_usec += 1000000;
    }
    out->tv_sec -= in->tv_sec;
}

int main()
{
    struct timeval out,in;
    gettimeofday(&in,NULL);
    sleep(1);
    gettimeofday(&out,NULL);
    tv_sub(&out,&in);
    printf("用时：%d.%d\n",out.tv_sec,out.tv_usec);
    return 0;
}

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