1/*
2** Copyright 2008 The Android Open Source Project
3**
4** Licensed under the Apache License, Version 2.0 (the "License");
5** you may not use this file except in compliance with the License.
6** You may obtain a copy of the License at
7**
8**     http://www.apache.org/licenses/LICENSE-2.0
9**
10** Unless required by applicable law or agreed to in writing, software
11** distributed under the License is distributed on an "AS IS" BASIS,
12** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13** See the License for the specific language governing permissions and
14** limitations under the License.
15*/
16
17#include <stdlib.h>
18#include <stdio.h>
19#include <errno.h>
20#include <sys/time.h>
21#include <sys/uio.h>
22#include <unistd.h>
23
24int main(int argc, char **argv) {
25    int i;
26
27    struct timeval tv1;
28    struct timeval tv2;
29    long max = 0;
30    long avg = 0;
31
32    for(i = 1; ; i++) {
33        gettimeofday(&tv1, NULL);
34        usleep(1000);
35        gettimeofday(&tv2, NULL);
36
37        long usec = (tv2.tv_sec - tv1.tv_sec) * 1000000 + tv2.tv_usec - tv1.tv_usec;
38        avg += usec;
39
40        if (usec > max) max = usec;
41        if (!(i % 1000)) {
42            avg /= 1000;
43            printf("max %ld\tavg %ld\n", max, avg);
44            max = 0;
45            avg = 0;
46        }
47    }
48    return 0;
49}
50