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  */
16 
17 #include <sys/syscall.h>
18 #include <unistd.h>
19 
20 #include <benchmark/benchmark.h>
21 
BM_unistd_getpid(benchmark::State & state)22 static void BM_unistd_getpid(benchmark::State& state) {
23   while (state.KeepRunning()) {
24     getpid();
25   }
26 }
27 BENCHMARK(BM_unistd_getpid);
28 
BM_unistd_getpid_syscall(benchmark::State & state)29 static void BM_unistd_getpid_syscall(benchmark::State& state) {
30   while (state.KeepRunning()) {
31     syscall(__NR_getpid);
32   }
33 }
34 BENCHMARK(BM_unistd_getpid_syscall);
35 
36 #if defined(__BIONIC__)
37 
38 // Stop GCC optimizing out our pure function.
39 /* Must not be static! */ pid_t (*gettid_fp)() = gettid;
40 
BM_unistd_gettid(benchmark::State & state)41 static void BM_unistd_gettid(benchmark::State& state) {
42   while (state.KeepRunning()) {
43     gettid_fp();
44   }
45 }
46 BENCHMARK(BM_unistd_gettid);
47 
48 #endif
49 
BM_unistd_gettid_syscall(benchmark::State & state)50 void BM_unistd_gettid_syscall(benchmark::State& state) {
51   while (state.KeepRunning()) {
52     syscall(__NR_gettid);
53   }
54 }
55 BENCHMARK(BM_unistd_gettid_syscall);
56 
57 BENCHMARK_MAIN()
58