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70 lines
2.2 KiB
70 lines
2.2 KiB
4 months ago
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/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <string.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <string>
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#include <android-base/stringprintf.h>
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#include <benchmark/benchmark.h>
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#include "util.h"
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BIONIC_TRIVIAL_BENCHMARK(BM_unistd_getpid, getpid());
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BIONIC_TRIVIAL_BENCHMARK(BM_unistd_getpid_syscall, syscall(__NR_getpid));
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// TODO: glibc 2.30 added gettid() too.
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#if defined(__BIONIC__)
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BIONIC_TRIVIAL_BENCHMARK(BM_unistd_gettid, gettid());
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#endif
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BIONIC_TRIVIAL_BENCHMARK(BM_unistd_gettid_syscall, syscall(__NR_gettid));
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// Many native allocators have custom prefork and postfork functions.
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// Measure the fork call to make sure nothing takes too long.
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void BM_unistd_fork_call(benchmark::State& state) {
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for (auto _ : state) {
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pid_t pid;
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if ((pid = fork()) == 0) {
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// Sleep for a little while so that the parent is not interrupted
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// right away when the process exits.
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usleep(100);
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_exit(1);
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}
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state.PauseTiming();
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if (pid == -1) {
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std::string err = android::base::StringPrintf("Fork failed: %s", strerror(errno));
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state.SkipWithError(err.c_str());
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}
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pid_t wait_pid = waitpid(pid, 0, 0);
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if (wait_pid != pid) {
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if (wait_pid == -1) {
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std::string err = android::base::StringPrintf("waitpid call failed: %s", strerror(errno));
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state.SkipWithError(err.c_str());
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} else {
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std::string err = android::base::StringPrintf(
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"waitpid return an unknown pid, expected %d, actual %d", pid, wait_pid);
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state.SkipWithError(err.c_str());
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}
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}
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state.ResumeTiming();
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}
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}
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BIONIC_BENCHMARK(BM_unistd_fork_call);
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