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); 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); 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); 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); 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
