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 
22 BENCHMARK_NO_ARG(BM_unistd_getpid);
Run(int iters)23 void BM_unistd_getpid::Run(int iters) {
24   StartBenchmarkTiming();
25 
26   for (int i = 0; i < iters; ++i) {
27     getpid();
28   }
29 
30   StopBenchmarkTiming();
31 }
32 
33 BENCHMARK_NO_ARG(BM_unistd_getpid_syscall);
Run(int iters)34 void BM_unistd_getpid_syscall::Run(int iters) {
35   StartBenchmarkTiming();
36 
37   for (int i = 0; i < iters; ++i) {
38     syscall(__NR_getpid);
39   }
40 
41   StopBenchmarkTiming();
42 }
43 
44 #if defined(__BIONIC__)
45 
46 // Stop GCC optimizing out our pure function.
47 /* Must not be static! */ pid_t (*gettid_fp)() = gettid;
48 
49 BENCHMARK_NO_ARG(BM_unistd_gettid);
Run(int iters)50 void BM_unistd_gettid::Run(int iters) {
51   StartBenchmarkTiming();
52 
53   for (int i = 0; i < iters; ++i) {
54     gettid_fp();
55   }
56 
57   StopBenchmarkTiming();
58 }
59 
60 #endif
61 
62 BENCHMARK_NO_ARG(BM_unistd_gettid_syscall);
Run(int iters)63 void BM_unistd_gettid_syscall::Run(int iters) {
64   StartBenchmarkTiming();
65 
66   for (int i = 0; i < iters; ++i) {
67     syscall(__NR_gettid);
68   }
69 
70   StopBenchmarkTiming();
71 }
72