7e2ac30c920641587059b07ae7ccacccd652aef6
1 /*
2 * Copyright (C) 2014 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 */
17 #include "benchmark.h"
19 #include <sys/syscall.h>
20 #include <unistd.h>
22 static void BM_unistd_getpid(int iters) {
23 StartBenchmarkTiming();
25 for (int i = 0; i < iters; ++i) {
26 getpid();
27 }
29 StopBenchmarkTiming();
30 }
31 BENCHMARK(BM_unistd_getpid);
33 static void BM_unistd_getpid_syscall(int iters) {
34 StartBenchmarkTiming();
36 for (int i = 0; i < iters; ++i) {
37 syscall(__NR_getpid);
38 }
40 StopBenchmarkTiming();
41 }
42 BENCHMARK(BM_unistd_getpid_syscall);
44 // Stop GCC optimizing out our pure function.
45 /* Must not be static! */ pid_t (*gettid_fp)() = gettid;
47 static void BM_unistd_gettid(int iters) {
48 StartBenchmarkTiming();
50 for (int i = 0; i < iters; ++i) {
51 gettid_fp();
52 }
54 StopBenchmarkTiming();
55 }
56 BENCHMARK(BM_unistd_gettid);
58 static void BM_unistd_gettid_syscall(int iters) {
59 StartBenchmarkTiming();
61 for (int i = 0; i < iters; ++i) {
62 syscall(__NR_gettid);
63 }
65 StopBenchmarkTiming();
66 }
67 BENCHMARK(BM_unistd_gettid_syscall);